CN110130579B - Cement-based profile for combined concrete column and construction method thereof - Google Patents
Cement-based profile for combined concrete column and construction method thereof Download PDFInfo
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- CN110130579B CN110130579B CN201910359476.7A CN201910359476A CN110130579B CN 110130579 B CN110130579 B CN 110130579B CN 201910359476 A CN201910359476 A CN 201910359476A CN 110130579 B CN110130579 B CN 110130579B
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Abstract
The invention provides a combined concrete column which comprises a first section component and a second section component which are in contact, wherein the first section component comprises a plurality of section main bodies, stiffening ribs and reinforcing bars are arranged in the section main bodies, the sections of the section main bodies are an outer covering section and an inner core section, the second section component is a post-pouring cement-based material, the first section component is positioned at the outer side and the center of the combined concrete column, and the second section component is positioned between the outer side and the center of the combined concrete column. The invention further provides a structure and a construction method of the cement-based profile and the combined concrete column. The cement-based profile for the combined concrete column and the construction method thereof can be used for quickly constructing the combined concrete column, so that the construction speed is accelerated, meanwhile, the selection and combination of reasonable fiber cement-based materials can realize a rib-free structure, 3D printing construction is facilitated, and the cement-based profile is quick and convenient and has wide application prospect.
Description
Technical Field
The invention belongs to the technical field of building construction, relates to a combined concrete column constructed by cement-based sectional materials, and further relates to a method for constructing the combined concrete column by using the cement-based sectional materials.
Background
The building is a general term of buildings and structures, and is an artificial environment created by people by using the grasped material technical means and applying certain scientific laws, geomantic omen concepts and aesthetic rules to meet the needs of social life. The concrete is used as one of the engineering structural materials with the largest use amount in buildings, is widely applied to engineering construction of houses, water conservancy, municipal works and the like, is prepared by using cement as a cementing material, using sand and stone as aggregates and mixing the aggregates with water (which can contain additives and admixtures) according to a certain proportion, and stirring and maintaining the aggregates, and belongs to cement-based materials.
The concrete column is a column member made of concrete materials, is the most basic bearing member in engineering structures such as houses, bridges and the like, and has a wide application range. However, concrete columns currently use only a single concrete material, sometimes resulting in unnecessary waste.
Disclosure of Invention
In view of the above-mentioned disadvantages of the prior art, it is an object of the present invention to provide a cement-based profile for a composite concrete column and a construction method thereof for optimizing the performance and construction manner of a concrete column member, optimizing the mechanical properties of the concrete column member and increasing the construction speed to construct the composite concrete column while ensuring safety.
In order to achieve the above and other related objects, a first aspect of the present invention provides a composite concrete column comprising a first section member and a second section member in contact with each other, the first section member comprising a plurality of profile bodies having stiffening ribs and reinforcing bars therein, the profile bodies having an outer cross section and an inner cross section, the second section member being a post-cast cement-based material, the first section member being located at an outer side and a center of the composite concrete column, and the second section member being located between the outer side and the center of the composite concrete column.
The section is a section perpendicular to the extending direction of the combined concrete column. The outer envelope cross-section and the inner core cross-section are shaped cross-sections known to those skilled in the art. In particular, the outer casing section covers the outside of the concrete column. The section of the inner core is positioned in the center of the concrete column.
Preferably, the profile body material is a fibre cement based material.
More preferably, the fiber is selected from one of natural fiber and chemical fiber.
Further preferably, the natural fiber is selected from one of plant fiber or mineral fiber.
Further preferably, the chemical fiber is selected from one of inorganic fiber or synthetic fiber.
Preferably, the stiffening rib material is a fibre cement based material.
More preferably, the conditions of the fiber cement-based material are: the compressive strength is more than or equal to 30MPa, the tensile strength is more than or equal to 10MPa, and the tensile ultimate strain is more than or equal to 10%.
More preferably, the fiber cement-based material is an ecc (engineered cementitious composite) cement-based fiber reinforcement material.
The height of the profile main body is determined according to the size of the concrete column required actually.
The size and thickness of the section of the profile main body have a series of specified sizes, and the section can be used as a stressed concrete section and a construction template at the same time. The section area of the profile body is determined according to the size of the concrete column required actually.
Preferably, the wrapping section is a biaxial symmetric section, and the wrapping section is selected from one of a circular section and a rounded rectangular section. The circular cross-section or rounded rectangular cross-section is a cross-section of a shape well known to those skilled in the art. Specifically, the circular cross section covers the outer side of the concrete column and is in a hollow circular shape in the horizontal direction. The rounded rectangular cross section covers the outer side of the concrete column and is a hollow rounded rectangle in the horizontal direction.
More preferably, the profile body with circular section has dimensions according to formula (1),
the formula (1) is: t is more than or equal to D/20 and less than or equal to D/10,
wherein D is the outer diameter, mm; t is the wall thickness of the profile body, mm.
Further preferably, the outer diameter D is a series of specified dimensions, the minimum dimension being 100mm and increasing in magnitude per 20mm of array.
Further preferably, the wall thickness t of the profile body is a series of specified dimensions, with a minimum dimension of 10mm and increasing in the magnitude of every 5mm of the array, with a maximum dimension of 200 mm.
More preferably, the profile body with rounded rectangular section has dimensions according to formula (2),
the formula (2) is: max { a/20, b/20} < t ≦ max { a/10, b/10},
wherein a is the section length, mm; b is the section width, mm; t is the wall thickness of the profile body, mm.
Further preferably, the length a is a series of specified dimensions, the minimum dimension being 100mm and increasing in magnitude per 20mm of array.
Further preferably, the width b is a series of specified dimensions, the minimum dimension being 100mm and increasing in magnitude every 20mm of the array.
Further preferably, the wall thickness t of the profile body is a series of specified dimensions, with a minimum dimension of 10mm and increasing in the magnitude of every 5mm of the array, with a maximum dimension of 200 mm.
More preferably, the radius r of the round corner in the round-corner rectangular section is 3 t-4 t, wherein t is the wall thickness of the profile main body and mm. The outer wrapping section can be configured with the stress behavior of the cement-based stiffening rib reinforced section according to the size condition of the selected section main body. The stiffening ribs are cross-section protrusions made of the same cement-based material as the profile, and are used for increasing the rigidity of the profile and enhancing the interaction between the stiffening ribs and the post-cast cement-based material.
More preferably, when the section of the profile body is a rounded rectangular section and the size of the profile body conforms to formula (3), the rounded rectangular section of the profile body is provided with a stiffening rib; when the section of the profile main body is a circular section and the size of the profile main body conforms to the formula (4), the circular section of the profile main body is provided with a stiffening rib,
the formula (3) is: l0/min{a,b}＞8，
Equation (4) is: l0/D＞7，
Wherein l0Is the height of the profile main body, mm; d is the outer diameter, mm; a is the section length, mm; b is the cross-sectional width, mm.
Further preferably, the stiffening ribs in the profile main body which are in accordance with the formula (3) or (4) are arranged along the compression direction of the profile main body in a full-length mode, are uniformly distributed along the section, and the configuration number N is more than or equal to 4.
More preferably, when the rounded rectangular section of the profile main body is provided with a stiffening rib, the rib width dimension of the profile main body conforms to the formula (5); when the circular section of the profile main body is provided with the stiffening rib, the width dimension of the stiffening rib accords with the formula (6),
equation (5) is: max { a/8, b/8} < d ≦ max { a/4, b/4},
equation (6) is: 1/8D is not less than D not more than 1/4D,
wherein a is the section length, mm; b is the section width, mm; d is the outer diameter, mm; d is rib width, mm.
More preferably, when the section bar main body is provided with stiffening ribs on the rounded rectangular section or the circular section, the rib height dimension of the section bar main body conforms to the formula (7),
equation (7) is: t is more than or equal to 4T and less than or equal to 8T
Wherein T is rib height mm; t is the wall thickness of the profile body, mm.
Preferably, the section of the inner core is a biaxial symmetric section, and the section of the inner core is selected from one of an I-shaped section or a cross-shaped section. The i-shaped or cross-shaped cross-section is a shaped cross-section as is well known to those skilled in the art. Specifically, the I-shaped section is located at the center of the concrete column and is H-shaped in the horizontal direction. The cross-shaped section is positioned at the center of the concrete column and is cross-shaped in the horizontal direction.
Preferably, the dimension of the profile body with the inner core section conforms to formula (8),
equation (8) is: max { a/20, b/20} < t ≦ max { a/10, b/10},
wherein a is the section length, mm; b is the section width, mm; t is the wall thickness of the profile body, mm.
More preferably, the length a is a series of specified dimensions, the minimum dimension being 100mm and increasing in magnitude every 20mm of the array.
More preferably, the width b is a series of specified dimensions, the minimum dimension being 100mm and increasing in magnitude every 20mm of the array.
More preferably, the wall thickness t of the profile body is a series of specified dimensions, with a minimum dimension of 10mm and increasing in the order of magnitude of every 5mm and a maximum dimension of 200 mm.
Preferably, the cross-sectional edges of the core cross-section and the contours at the corners need to be smoothed. The requirement of the smoothing treatment is to polish the sharp corner shape into a round corner shape.
Preferably, the reinforcement is selected from one of steel reinforcement or frp (fiber reinforced polymer) composite reinforcement.
More preferably, the reinforcing ribs are uniformly arranged along the cross section and are parallel to the compression direction of the profile main body.
More preferably, the reinforcing ribs are arranged according to the stress condition of the profile main body and can be stressed together with the profile main body. The integral bearing capacity of the section bar can be improved.
More preferably, the reinforcement ratio of the reinforcement meets the requirement of the minimum reinforcement ratio in national standard GB50010 concrete structure design Specification. When the section bar meets the stress requirement, the reinforcement ratio can be 0.
Preferably, the inner surface of the outer wrapping section of the profile main body and the outer surface of the inner core section of the profile main body are processed to form a rough surface. The rough surface can enhance the interface mechanical property with the cement-based material.
Preferably, the surface processing mode of the profile main body adopts the existing interface processing mode of the common new and old concrete.
More preferably, the surface processing mode of the profile main body is selected from one of a scabbling mode and a galling mode. Can form uniform rough surface, and simultaneously ensures no loose slag and no rib leakage.
Preferably, the length of the profile body is determined according to the actual engineering story height, and the cement-based stiffener length is equal thereto.
Preferably, the compressive bearing capacity N of the member in the combined concrete column is in accordance with the axial compression working conditioncuNot less than the compressive bearing capacity N of the concrete column (N is less than or equal to N)cu) And the compressive bearing capacity N of the membercuIn accordance with the formula (9),
the formula (9) is: n is a radical ofcu＝fcs·Acs+fc·(A-Acs)+As·fs，
Wherein, N is the compressive bearing capacity of the concrete column calculated according to the arrangement mode of the column, and N; n is a radical ofcuThe compressive bearing capacity of a member in the combined concrete column is N; f. ofcsIs the compressive strength, MPa, of the first segment member; a. thecsIs the cross-sectional area of the first section member, mm2；fcIs the compressive strength, MPa, of the second segment member; a is a combination mixtureTotal cross-sectional area of column, mm2；AsThe cross-sectional area, mm, of the reinforcing bars in the first section member2；fsThe compressive strength, MPa, of the reinforcement in the first segment member.
The compressive bearing capacity N is calculated according to the elasticity or plasticity theory applied by the method specified in the 5 th structural analysis in the national standard GB50010 concrete structure design Specification.
Preferably, the normal section compressive bearing capacity N of the member in the combined concrete column is relative to the bias working conditionuNot less than the compressive bearing capacity N of the concrete column (N is less than or equal to N)u) And the normal section of the member is loaded by the pressure NuAccording to the formulas (10) and (11),
equation (10) is: n is a radical ofu＝α1fcbx+f′yA′s+N'cs-σsAs-Ncs，
The formula (11) is:
wherein, N is the compressive bearing capacity of the concrete column calculated according to the arrangement mode of the column, and N; n is a radical ofuThe normal section compressive bearing capacity N of a member in the combined concrete column is shown; alpha is alpha1Or a dimensionless reduction factor; f. ofcIs the compressive strength, MPa, of the second segment member; b is the section width of the combined concrete column, mm; x is the height of the cross section compression area of the combined concrete column, and is mm; f'yThe compressive strength of the reinforcement in the section compression area of the combined concrete column in the first section member is MPa; a'sCross-sectional area, mm, of reinforcement in the compression zone of the cross-section of the composite concrete column in the first sectional element2；NcsProviding axial tension, N, for the first section member in a tension area of the section of the combined concrete column; sigmasDistributing the tensile stress of the reinforcement in the section tension area of the combined concrete column in the first section member, wherein the tensile stress is MPa; a. thesThe cross section of the reinforcing bars in the tension area of the cross section of the combined concrete column in the first section member is mm2；N'csIs a first section member in a combined concrete sectionAxial pressure provided by the compression zone, N; e is the eccentricity of the axial force borne by the combined concrete column, mmh0The height of the section of the combined concrete column is mm; a'sThe distance between the edge of the compression area of the section of the combined concrete column and the center of a reinforcement of the compression area is mm; mcsA bending moment, N mm, provided to the first segment member.
The compressive bearing capacity N is calculated according to the elasticity or plasticity theory applied by the method specified in the 5 th structural analysis in the national standard GB50010 concrete structure design Specification.
Alpha above1And calculating according to the regulation of the 6.2.6 in the national standard GB50010 concrete structure design Specification. N is abovecs、N'cs、McsThe calculation is carried out according to the method specified in the 5 th structural analysis in the national standard GB50010 concrete structural design Specification.
Preferably, the calculation of the compressive bearing capacity N is performed by using an existing calculation method. Specifically, the method specified in section 5 'structural analysis' in the national standard GB50010 'concrete structure design Specification' is adopted, and the elasticity or plasticity theory is used for calculation. Specifically, the combined concrete column adopts conventional stress analysis of a single material to calculate the bearing capacity borne by the combined concrete column.
Preferably, the first segment members are profile bodies of different cross-sectional forms according to the arrangement position of the columns.
More preferably, in the first sectional member, a profile body having an outer-clad section is disposed outside a section of the composite concrete column, and a profile body having an inner-core section is disposed at a section center of the composite concrete column.
Preferably, the compressive strength of the second segment member is ≧ 30 MPa.
Preferably, when the second section member needs to have a certain function, a post-cast cement-based material with a corresponding function is selected; the second section member may be designed to contain building waste, if desired, and may be formed from recycled concrete as a post-cast cement-based material.
Preferably, the cement-based section selected by the first section member and the post-cast cement-based material selected by the second section member take interface performance among the cement-based materials into consideration, and the block areas of the combined concrete column are optimally designed while the stress requirement of the combined concrete column is met.
The invention provides a cement-based profile which is used as a first section member of the combined concrete column, and comprises a profile main body and a stiffening rib and a reinforcing bar in the profile main body, wherein the section of the profile main body is selected from one of an outer wrapping section or an inner core section.
A third aspect of the invention provides the use of the above-described cement-based profile for a composite concrete column.
The invention provides a construction method of a cement-based profile, which is selected from one of a prefabricated template method and a 3D printing method.
Preferably, the prefabricated formwork method is to mix the raw materials of the cement-based profile, pour the mixture into a mold for molding, maintaining and demolding to obtain the cement-based profile.
More preferably, the mould is a custom made steel mould. The mould has a certain modulus and can be recycled.
More preferably, the surface of the cement-based profile bonded to the post-cast cement-based material is machined after the form removal. The processed cement-based section bar has a rough surface, so that the interfacial occlusion force among the cement-based materials is increased, and the interfacial bonding performance among the cement-based materials is improved.
Further preferably, the surface processing mode is selected from one of a scabbling mode and a galling mode.
More preferably, said mixing, shaping, curing meets the standard conditions in existing specifications for prefabricated cement-based material components.
More preferably, the dimensional error of the cement-based material is controlled within 2 mm. The surface of the cement-based material is free of defects.
Preferably, the 3D printing method mixes the raw materials of the cement-based profile to form an ink material, and inputs the ink material into a 3D printer for printing. The 3D printing method is suitable for the condition that the section bar structure is complex and the common prefabricated template method is not suitable; it is also suitable for the condition that the section bar does not need reinforcement.
More preferably, the 3D printing should be performed in a factory using a 3D printer for molding.
More preferably, the 3D printing is printed in layers around the ring.
More preferably, after the 3D printing is finished, the inner layers of the profile are not allowed to slide, and the size error is controlled within 2 mm.
The 3D printing method can be used for printing various shapes, can naturally form a rough wave surface on the section bar, and is beneficial to the interface bonding performance between cement-based materials.
The fifth aspect of the present invention provides a method for constructing a composite concrete column, comprising the steps of:
A) taking the section bar with the outer wrapping section prepared by the construction method of the cement-based section bar as an outer wrapping template;
B) placing the section with the inner core section prepared by the construction method of the cement-based section in an outer coating template;
C) and pouring the post-poured cement-based material on the outer coating template, and then forming and maintaining to obtain the combined concrete column.
Preferably, in step C), the post-cast cement-based material is selected from one of a load-bearing cement-based material or a functional cement-based material.
More preferably, the load-bearing cement-based material is selected from one of ordinary concrete, recycled concrete and seawater sea sand concrete which meet the strength requirement. The load-bearing cement-based material has certain strength and is suitable for being used as a load-bearing material.
More preferably, the compressive strength of the load-bearing cement-based material is more than or equal to 30 MPa.
More preferably, the functional cement-based material is selected from one of foamed concrete and rubber concrete which meet functional requirements. The functional cement-based material has the functions of heat preservation, heat insulation, sound insulation, energy consumption and the like.
More preferably, in the step C), the pouring, forming and maintaining need to meet the standard conditions for the construction of the cast-in-place cement-based material in the existing specifications. So that the post-cast cement-based material has no surface cracking phenomenon.
The invention provides a concrete composite column which is used for a composite concrete column, has the concept of 'composite concrete', namely, with the appearance of a plurality of novel cement-based materials, the characteristics of different cement-based materials can be combined, an optimized concrete member is designed, the technical requirement of sustainable utilization is met, even a rib-free form can be achieved, the use of materials such as steel and the like is reduced, and the 3D printing technology is convenient to apply.
As described above, the present invention provides a cement-based profile for a composite concrete column and a construction method thereof, which have the following advantageous effects:
(1) according to the cement-based profile for the combined concrete column and the construction method thereof, due to the excellent strength and ductility of the fiber cement-based material, the defect of small stretching ductility of the traditional concrete is overcome, the mechanical property of the concrete column can be optimized on the premise of ensuring safety, the manufactured profile can be used as a template, the construction is rapid, and the application range is wider compared with that of a common concrete prefabricated member.
(2) According to the cement-based profile for the combined concrete column and the construction method thereof, provided by the invention, due to the good performance of the fiber cement-based material, reinforcement can be reduced or a reinforcement-free form can be realized, the popularization and the application of a 3D printing technology are facilitated, and a new path is provided for the popularization of the 3D printing technology in a building structure.
(3) According to the cement-based profile for the combined concrete column and the construction method thereof, when the combined concrete column is constructed, because of compatibility and mutual growth among cement-based materials, the interface performance is better than that of a steel-concrete combined structure adopting a steel profile or a combined structure of profiles made of other materials, the interface treatment and the interface construction are simple, and a shear key is not needed.
Drawings
Fig. 1 shows the schematic structural diagrams 1a, 1b, 1c, 1d of a cement-based column profile with a circular cross-section, wherein fig. 1a is a circular cross-section without reinforcing ribs and without reinforcing ribs, fig. 1b is a circular cross-section without reinforcing ribs and with reinforcing ribs, fig. 1c is a circular cross-section without reinforcing ribs and fig. 1d is a circular cross-section with reinforcing ribs and reinforcing ribs.
Fig. 2 shows a schematic structural view of a fabricated concrete column constructed using cement-based column profiles of circular cross-section.
Fig. 3 shows the schematic structural diagrams 3a, 3b, 3c, 3d of the cement-based column profile with rounded rectangular cross-section, wherein fig. 3a is the rounded rectangular cross-section without reinforcing ribs, fig. 3b is the rounded rectangular cross-section without reinforcing ribs, fig. 3c is the rounded rectangular cross-section without reinforcing ribs, and fig. 3d is the rounded rectangular cross-section without reinforcing ribs and reinforcing ribs.
Fig. 4 shows a schematic structural view of a fabricated concrete column constructed using a rounded rectangular cross-section cement-based column profile.
Fig. 5 shows a schematic structural view of a cement-based column section having an i-shaped cross-section.
Fig. 6 is a schematic structural view of a composite concrete column constructed using an i-shaped section cement-based column profile and a cement-based column profile having a circular section.
Figure 7 shows a schematic view of the construction of a cement-based column profile with a cross-shaped cross-section.
Fig. 8 is a schematic structural view showing a combined concrete column constructed using a cement-based column section having a cross-shaped section and a cement-based column section having a circular section.
Reference numerals
1 first segment component
11 section bar main body
12 stiffener
13 reinforcing bar
2 second segment component
Outer diameter of D section bar main body
Rib width of stiffening rib in d section main body
Rib height of stiffening rib in T-shaped material main body
Wall thickness of t-section body
Length of a cross section
b width of cross section
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Please refer to fig. 1 to 8. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
As shown in fig. 1 to 8, the present invention provides a composite concrete column, comprising a first section member and a second section member which are in contact with each other, wherein the first section member comprises a plurality of profile bodies, the profile bodies have stiffening ribs and reinforcing bars inside, the profile bodies have an outer covering section and an inner core section in cross section, the second section member is a post-cast cement-based material, the first section member is located at the outer side and the center of the composite concrete column, and the second section member is located between the outer side and the center of the composite concrete column.
In a preferred embodiment, the profile body material is a fibre cement based material. The fiber cement-based material is a composite material which is prepared by taking cement as a matrix, taking fibers as a reinforcement, adding a filler, an additive and water in a certain proportion, and stirring and maintaining the mixture.
Wherein the fiber is selected from one of natural fiber and chemical fiber. The fiber is a substance consisting of continuous or discontinuous filaments, and can achieve the effect of toughening the cement-based material.
Further, the natural fiber is selected from one of plant fiber or mineral fiber. The natural fiber refers to a fiber which exists in the nature and can be directly obtained.
Further, the chemical fiber is selected from one of inorganic fiber or synthetic fiber. The chemical fiber refers to a fiber produced by chemical processing.
In a preferred embodiment, the stiffener material is a fiber cement-based material. The stiffening rib is a stiffening component made of the same cement-based material as the profile body, and is used for enhancing the rigidity and stability of the cement-based column profile and enhancing the interaction between the stiffening rib and the post-poured cement-based material.
Wherein the fiber cement-based material is conditioned by: the compressive strength is more than or equal to 30MPa, the tensile strength is more than or equal to 10MPa, and the tensile ultimate strain is more than or equal to 10%. The fiber cement-based material should have high ductility as well as high strength.
Further, the fiber cement-based material is selected from ecc (engineered cementitious composite) cement-based fiber reinforcement materials. The ECC cement-based fiber reinforced material is a fiber cement-based material commonly used in the existing building engineering.
In a specific embodiment, the section of the profile body, the size and the thickness of which have a series of specified sizes, can be used as a stressed concrete section and a construction template at the same time. The section area of the profile body is determined according to the size of the concrete column required actually.
In a preferred embodiment, the cross section of the sheath is a cross section of a biaxial symmetric type, and the cross section of the sheath is selected from one of a circular cross section and a rounded rectangular cross section.
Further, as shown in fig. 1, the size of the profile body with a circular cross section conforms to the formula (1),
the formula (1) is: t is more than or equal to D/20 and less than or equal to D/10,
wherein D is the outer diameter, mm; t is the wall thickness of the profile body, mm. The circular cross section is determined by two parameters, the outer diameter D and the wall thickness t of the profile body.
Further, the outer diameter D is a series of specified sizes, with a minimum size of 100mm and increases in magnitude every 20mm of the array. The wall thickness t of the profile body is a series of specified dimensions, the minimum dimension being 10mm and increasing in the magnitude of every 5mm of the array, the maximum dimension being 200 mm.
Further, as shown in fig. 3, the size of the profile body with the rounded rectangular cross section conforms to the formula (2),
the formula (2) is: max { a/20, b/20} < t ≦ max { a/10, b/10},
wherein a is the section length, mm; b is the section width, mm; t is the wall thickness of the profile body, mm. The round-corner rectangular section is determined by three parameters of section length a, section width b and wall thickness t of the section main body. And the radius r of the round corner in the round-corner rectangular section is 3 t-4 t.
Further, the cross-sectional length a is a series of specified dimensions, with the minimum dimension being 100mm and increasing in magnitude per 20mm of array. The section width b is a series of specified dimensions, the minimum dimension being 100mm and increasing in magnitude per 20mm of array. The wall thickness t of the profile body is a series of specified dimensions, the minimum dimension being 10mm and increasing in the magnitude of every 5mm of the array, the maximum dimension being 200 mm.
In a preferred embodiment, when the section of the profile body is a rounded rectangular section and the dimension of the profile body conforms to formula (3), the rounded rectangular section of the profile body is provided with a stiffening rib; when the section of the profile main body is a circular section and the size of the profile main body conforms to the formula (4), the circular section of the profile main body is provided with a stiffening rib,
the formula (3) is: l0/min{a,b}＞8，
Equation (4) is: l0/D＞7，
Wherein l0Is the height of the profile main body, mm; d is the outer diameter, mm; a is the section length, mm; b is the cross-sectional width, mm.
Furthermore, the stiffening ribs in the section bar main body which accord with the formula (3) or (4) are arranged along the compression direction of the section bar main body in a through length manner, are uniformly distributed along the section, and the configuration number N is more than or equal to 4.
In a preferred embodiment, when the rounded rectangular section of the profile body is provided with the stiffening rib, the rib width dimension of the stiffening rib conforms to the formula (5); when the circular section of the profile main body is provided with the stiffening rib, the width dimension of the stiffening rib accords with the formula (6),
equation (5) is: max { a/8, b/8} < d ≦ max { a/4, b/4},
equation (6) is: 1/8D is not less than D not more than 1/4D,
wherein a is the section length, mm; b is the section width, mm; d is the outer diameter, mm; d is rib width, mm.
In a preferred embodiment, when the section body is provided with stiffening ribs on the rounded rectangular section or the circular section, the rib height dimension of the section body conforms to the formula (7),
equation (7) is: t is more than or equal to 4T and less than or equal to 8T
Wherein T is rib height mm; t is the wall thickness of the profile body, mm.
In a preferred embodiment, the core cross-section is a biaxially symmetric cross-section, and the core cross-section is selected from one of an i-section and a cross-section. The sectional area of the profile body with the inner core section is determined according to the size of the actual concrete column, so that the profile body with the outer wrapping section can be placed in.
In a preferred embodiment, as shown in fig. 5 and 7, the size of the profile body with the inner core section conforms to the formula (8),
equation (8) is: max { a/20, b/20} < t ≦ max { a/10, b/10},
wherein a is the section length, mm; b is the section width, mm; t is the wall thickness of the profile body, mm. The section of the inner core is determined by three parameters of section length a, section width b and wall thickness t of the section main body.
Further, the section length a is a series of specified dimensions, the minimum dimension being 100mm and increasing in magnitude per 20mm of array. The section width b is a series of specified dimensions, the minimum dimension being 100mm and increasing in magnitude per 20mm of array. The wall thickness t of the profile body is a series of specified dimensions, the minimum dimension being 10mm and increasing in the magnitude of every 5mm of the array, the maximum dimension being 200 mm.
In a preferred embodiment, the cross-sectional edges of the core cross-section and the contours at the corners need to be smoothed. The requirement of the smoothing treatment is to polish the sharp corner shape into a round corner shape.
In a preferred embodiment, the reinforcement is selected from one of rebar or frp (fiber reinforced polymer) composite rebar.
Further, the reinforcing ribs are uniformly arranged along the section and are parallel to the compression direction of the profile main body. The reinforcing bars are arranged according to the stress condition of the profile main body and can bear the force together with the profile main body. The integral bearing capacity of the section bar can be improved. The reinforcement ratio of the reinforcement meets the requirement of the minimum reinforcement ratio in the national standard GB50010 concrete structure design Specification. When the section bar meets the stress requirement, the reinforcement ratio can be 0.
In a preferred embodiment, the inner surface of the outer envelope section of the profile body and the outer surface of the inner core section of the profile body are machined to form a rough surface. The rough surface can enhance the interface mechanical property with the cement-based material.
In a preferred embodiment, the profile body is processed by adopting an existing interface treatment method of the general new and old concrete.
Specifically, the surface processing mode of the profile main body is selected from one of a scabbling mode and a galling mode. Can form uniform rough surface, and simultaneously ensures no loose slag and no rib leakage.
In a preferred embodiment, the length of the profile body is determined according to the actual engineering story height, and the cement-based stiffeners are equal to it.
Example 1
The concrete column is built by adopting the cement-based section, the conventional stress analysis of a single material can be adopted, and the compressive bearing capacity N borne by the concrete column is calculated according to the elasticity or plasticity theory in the national standard GB50010 concrete structure design Specification.
The concrete column is partitioned into a first section component and a second section component to form the combined concrete column, cement-based sectional materials with different section forms are selected by the first section component according to the arrangement position of the column, the cement-based sectional material with an outer wrapping section is arranged on the outer side of the section of the combined concrete column, and the cement-based sectional material with an inner core section is arranged in the center of the section of the combined concrete column.
The second segment component is a post-cast cement-based material as designed and arranged between the cement-based profile with the outer wrapping section and the cement-based profile with the inner core section. The compressive strength of the post-cast cement-based material is more than or equal to 30 MPa. When the second section member needs to have a certain function, a post-cast cement-based material with a corresponding function needs to be selected. The second section member is designed to take up construction waste, using recycled concrete as a post-cast cement-based material.
Aiming at the axial compression working condition, the compression bearing capacity N of the member in the combined concrete columncuNot less than the compressive bearing capacity N of the concrete column (N is less than or equal to N)cu) And the compressive bearing capacity N of the membercuIn accordance with equation (9), equation (9) is: n is a radical ofcu＝fcs·Acs+fc·(A-Acs)+As·fsWherein, N is the compressive bearing capacity of the concrete column calculated according to the arrangement mode of the column, and N; n is a radical ofcuThe compressive bearing capacity of a member in the combined concrete column is N; f. ofcsIs the compressive strength, MPa, of the first segment member; a. thecsIs the cross-sectional area of the first section member, mm2；fcIs the compressive strength, MPa, of the second segment member; a is the total sectional area of the combined concrete column, mm2；AsThe cross-sectional area, mm, of the reinforcing bars in the first section member2；fsThe compressive strength, MPa, of the reinforcement in the first segment member.
Aiming at the bias working condition, the normal section compressive bearing capacity N of the member in the combined concrete columnuNot less than the compressive bearing capacity N of the concrete column (N is less than or equal to N)u) And the normal section of the member is loaded by the pressure NuAccording to the formulas (10) and (11), the formula (10) is: n is a radical ofu＝α1fcbx+f′yA′s+N'cs-σsAs-NcsThe formula (11) is:
wherein, N is the compressive bearing capacity of the concrete column calculated according to the arrangement mode of the column, and N; n is a radical ofuThe normal section compressive bearing capacity N of a member in the combined concrete column is shown; alpha is alpha1Or a dimensionless reduction factor; f. ofcIs the compressive strength, MPa, of the second segment member; b is the section width of the combined concrete column, mm; x is the height of the cross section compression area of the combined concrete column, and is mm; f'yThe compressive strength of the reinforcement in the section compression area of the combined concrete column in the first section member is MPa; a'sCross-sectional area, mm, of reinforcement in the compression zone of the cross-section of the composite concrete column in the first sectional element2；NcsProviding axial tension, N, for the first section member in a tension area of the section of the combined concrete column; sigmasDistributing the tensile stress of the reinforcement in the section tension area of the combined concrete column in the first section member, wherein the tensile stress is MPa; a. thesThe cross section of the reinforcing bars in the tension area of the cross section of the combined concrete column in the first section member is mm2；N'csProviding axial pressure, N, for the first section member in the compression zone of the combined concrete section; e is the eccentricity of the axial force borne by the combined concrete column, and is mm; h is0The height of the section of the combined concrete column is mm; a'sThe distance between the edge of the compression area of the section of the combined concrete column and the center of a reinforcement of the compression area is mm; mcsA bending moment, N mm, provided to the first segment member. Alpha above1And calculating according to the regulation of the 6.2.6 in the national standard GB50010 concrete structure design Specification. N is abovecs、N'cs、McsThe calculation is carried out according to the method specified in the 5 th structural analysis in the national standard GB50010 concrete structural design Specification.
Example 2
The cement-based section is constructed by adopting a prefabricated template method or a 3D printing method.
The construction is carried out by adopting a prefabricated template method, the raw materials of the cement-based section are mixed, poured into a mould for forming and curing, and the cement-based section is obtained after the mould is removed. The mould is a custom made steel mould. And after the mould is removed, the inner surface of the outer wrapping section profile and the outer surface of the inner core section profile are processed by adopting a chiseling or napping process.
The construction method comprises the following steps of adopting a 3D printing method for construction, mixing raw materials of the cement-based profile to be used as an ink material, and inputting the ink material into a 3D printer for printing. 3D printing should be shaped in a factory using a 3D printer. The 3D printing surrounds the layered printing. After 3D printing is finished, slippage is not allowed to occur between the inner layers of the section bar, and the size error is controlled within 2 mm.
Example 3
According to the requirements for building the combined concrete column in the embodiment 1, the section bar with the outer wrapping section prepared according to the embodiment 2 is used as an outer wrapping template, the section bar with the inner core section prepared according to the embodiment 2 is placed in the outer wrapping template, the post-cast cement-based material is poured on the outer wrapping template, and the combined concrete column is obtained after forming and curing. Wherein, the post-cast cement-based material is selected from one of load-bearing cement-based materials or functional cement-based materials. Wherein, the load-bearing cement-based material is selected from one of common concrete, recycled concrete and seawater sea sand concrete which meet the strength requirement. The compressive strength of the load-bearing cement-based material is more than or equal to 30 MPa. The functional cement-based material is selected from one of foam concrete and rubber concrete which meet the functional requirements.
Example 4
As shown in figure 1, a cement-based column section bar sample 1# with a circular section is arranged according to the stress characteristics of the combined concrete column. The cement-based profile sample 1# is poured by using an ECC fiber cement-based material as a raw material, and as shown in fig. 1a, the axial force borne by the combined concrete column is calculated according to the requirement of constructing the combined concrete column in example 1 for the cement-based profile sample 1 #. If special stiffness and stability requirements are required, cement-based stiffeners may be provided on the basis of the cement-based profile, as shown in fig. 1 b. If the bearing capacity requirement of the combined concrete column is larger, section bar reinforcing bars can be arranged in the combined concrete column, and as shown in fig. 1c, reinforcing bars are arranged as longitudinal bars of the column, so that the bearing capacity of the cement-based column section bar is increased. As shown in fig. 1d, the cement-based stiffeners and the profile reinforcing bars can be provided simultaneously.
As shown in fig. 2, a cement-based column profile sample # 1 having a circular cross-section was used to construct a composite concrete column and constructed according to the prefabricated form method of example 2, which was mixed, formed and cured to meet the standard conditions for prefabricated cement-based material members in the existing specifications, with a dimensional error controlled within 2mm and a surface free of defects. When the combined concrete column is in specific construction, the template is arranged firstly, the cement-based beam profile sample No. 1 is directly used as a main stress member and is also used as a construction template, post-cast cement-based material is poured on the template, the post-cast cement-based material is recycled concrete, the safety is met, meanwhile, the recycled material can be fully and reasonably applied, and certain environmental benefits are achieved.
Calculating the compressive bearing capacity N of the members in the combined concrete column according to the structural arrangementcuThe combined concrete column adopts a cylinder, the height of the column is 3000mm, and the diameter is 400 mm. Therefore, a section with a circular section and a thickness t of 400mm is selected, the thickness t of the section is 40mm, and the height l of the section is equal to or less than 400mm0＝3000mm。l0the/D is more than 7, stiffening ribs need to be arranged, the width D of each stiffening rib is 150mm, the height T of each stiffening rib is 160mm, the dimensional requirements are met, the stiffening ribs are uniformly arranged around the circular cross section, the compressive strength of the selected ECC is 50MPa, and the strength of the selected post-cast cement-based material recycled concrete is 30 MPa. Formula (9) is used: n is a radical ofcu＝fcs·Acs+fc·(A-Acs)+As·fsThe reinforcing bars adopt 6 reinforcing bars with the diameter of 14mm, and the compressive strength is 300 MPa. The specific calculation results are shown in table 1 below.
TABLE 1
| Is not preparedRibs | Reinforcing bar | |
| Axial force N/kN | 4.67 | 32.36 |
As can be seen from Table 1, the combined concrete column adopting the section bar without reinforcement can reach the axial bearing capacity of 4.67kN, and after reinforcement, the combined concrete column can reach the bearing capacity of 32.36kN, and the selection is carried out according to the requirement of the bearing capacity.
Example 5
As shown in fig. 3, a cement-based section sample 2# with a rounded rectangular cross section is set according to the stress characteristics of the composite concrete column. The cement-based profile sample No. 2 was cast using ECC fiber cement-based material as the raw material. As shown in fig. 3a, cement-based profile sample # 2 can be used directly according to the calculation requirements. If special stiffness and stability requirements are met, cement-based stiffeners may be provided on the basis of the cement-based profile, as shown in fig. 3 b. If the bearing capacity requirement of the combined concrete column is larger, as shown in fig. 3c, a reinforcing steel bar is arranged in the main body of the cement-based profile as a longitudinal bar, so that the tensile bearing capacity of the cement-based profile is increased. As shown in fig. 3d, the cement-based stiffeners and the profile reinforcing bars can be provided simultaneously.
As shown in fig. 4, a cement-based profile sample 2# having a rounded rectangular cross-section was used to construct a fabricated concrete column, and was constructed according to the prefabricated form method of example 2, which was mixed, formed, and cured to meet the standard conditions for prefabricated cement-based material members in the existing specifications, with dimensional errors controlled to be within 2mm, and with no surface defects. When the combined concrete column is in specific construction, a cement-based section sample No. 2 is directly used as a main stress member to arrange a template, and then post-pouring cement-based material is injected, wherein the post-pouring cement-based material is seawater and sea sand concrete, so that the safety requirement is met, the ocean resources can be fully and reasonably applied, and the problem of lack of river sand and fresh water resources at present is solved.
According to structural arrangementsCalculating to obtain the compressive bearing capacity N of the member in the combined concrete columncuThe combined concrete column adopts a round corner rectangular column, the height of the column is 3500mm, and the length and the width of the section are 400 mm. Therefore, a 400mm rectangular section with rounded corners is selected, the thickness t is 40mm, and the height l of the section is equal to the thickness t0＝3500mm。l0And the/a is more than 8, stiffening ribs need to be arranged, the width d of each stiffening rib is 150mm, the height T of each stiffening rib is 160mm, the dimensional requirements are met, the stiffening ribs are uniformly arranged around the circular cross section, the compressive strength of the selected ECC is 50MPa, and the strength of the selected post-cast cement-based material seawater sea sand concrete is 30 MPa. Formula (9) is used: n is a radical ofcu＝fcs·Acs+fc·(A-Acs)+As·fsThe reinforcing bars adopt 6 reinforcing bars with the diameter of 14mm, and the compressive strength is 300 MPa. The specific calculation results are shown in table 2 below.
TABLE 2
| Without reinforcement | Reinforcing bar | |
| Axial force N/kN | 5.95 | 33.65 |
As can be seen from Table 2, the combined concrete column adopting the section bar without reinforcement can reach the axial bearing capacity of 5.95kN, and after reinforcement, the combined concrete column can reach the bearing capacity of 33.65kN, and the selection is carried out according to the requirement of the bearing capacity.
Example 6
As shown in FIG. 5, a sample No. 3 of the cement-based section with an I-shaped section is set according to the stress characteristics of the combined concrete column. The cement-based profile sample No. 3 was cast using ECC fiber cement-based material as the raw material.
As shown in fig. 6, a cement-based profile sample 3# having an i-shaped cross-section is used to construct a composite concrete column and is constructed according to the prefabricated form method of example 2, and the mixing, forming and curing thereof should meet the standard conditions for prefabricated cement-based material members in the existing specifications, with a dimensional error controlled within 2mm and a surface free of defects. When the combined concrete column is in specific construction, the combined concrete column is combined with a cement-based profile sample 1# with a circular section for use, the cement-based profile sample 1# is used as an outer-wrapping template, a cement-based profile sample 3# is placed in the outer-wrapping template, and then a post-pouring cement-based material is poured into the outer-wrapping template. The post-cast cement-based material is foam concrete, so that the bearing capacity is met, and the energy consumption performance of the column is improved.
Calculating the normal section compression bearing capacity N of the members in the combined concrete column according to the structural arrangementuThe eccentricity is 100mm, the combined concrete column adopts a cylinder, the height of the column is 2000mm, and the diameter is 400 mm. Therefore, a section with a circular section and a thickness t of 400mm is selected, the thickness t of the section is 40mm, and the height l of the section is equal to or less than 400mm0＝2000mm。l0And D is less than 7, no stiffening rib is needed, the compressive strength of ECC is 30MPa, the tensile strength is 10MPa, the tensile limit strain is more than or equal to 10%, the I-shaped section a is 240mm, t is 20mm, and the strength of the selected post-cast cement base material foam concrete is 20 MPa. Using equation (10): n is a radical ofu＝α1fcbx+f′yA′s+N'cs-σsAs-NcsFormula (11):
the reinforcing bars adopt 6 reinforcing steel bars with the diameter of 14mm, and the compressive strength is 300 MPa. The specific calculation results are shown in table 3 below.
TABLE 3
| Without reinforcement | Reinforcing bar | |
| Axial force N/kN | 3.56 | 20.32 |
As can be seen from Table 3, the combined concrete column adopting the section bar without reinforcement can reach an eccentric pressure of 3.56kN, and after reinforcement, the bearing capacity of 20.32kN can be achieved, and the selection is carried out according to the requirement of the bearing capacity.
Example 7
As shown in FIG. 7, a cement-based profile sample 4# with a cross-shaped cross section is set according to the stress characteristics of the composite concrete column. The cement-based profile sample No. 4 was cast using ECC fiber cement-based material as the raw material.
As shown in fig. 8, a cement-based profile sample No. 4 having a cross-shaped cross-section was used to construct a fabricated concrete column, and was constructed according to the prefabricated form method of example 2, which was mixed, formed, and cured to meet the standard conditions for prefabricated cement-based material members in the existing specifications, with a dimensional error controlled within 2mm, and without defects on the surface. When the combined concrete column is in specific construction, the combined concrete column is combined with a cement-based profile sample 1# with a circular section for use, the cement-based profile sample 1# is used as an outer-wrapping template, a cement-based profile sample 4# is placed in the outer-wrapping template, and then a post-pouring cement-based material is poured into the outer-wrapping template. The post-cast cement-based material is common concrete, and the mechanical property of the concrete column can be optimized.
Calculating the elements in a composite concrete column according to the structural arrangementNormal section compressive bearing capacity NuThe eccentricity is 100mm, the combined concrete column adopts a cylinder, the height of the column is 2000mm, and the diameter is 400 mm. Therefore, a section with a circular section and a thickness t of 400mm is selected, the thickness t of the section is 40mm, and the height l of the section is equal to or less than 400mm0＝2000mm。l0the/D is less than 7, no stiffening rib is needed, the compressive strength of ECC is 30MPa, the tensile strength is 10MPa, the tensile ultimate strain is more than or equal to 10%, the cross-shaped section a is 240mm, t is 20mm, and the strength of the selected post-cast cement-based material ordinary concrete is 30 MPa. Using equation (10): n is a radical ofu＝α1fcbx+f′yA′s+N'cs-σsAs-NcsFormula (11):
the reinforcing bars adopt 6 reinforcing steel bars with the diameter of 14mm, and the compressive strength is 300 MPa. The specific calculation results are shown in Table 4 below.
TABLE 4
| Without reinforcement | Reinforcing bar | |
| Axial force N/kN | 3.26 | 19.56 |
As can be seen from Table 4, the combined concrete column adopting the section bar without reinforcement can reach an eccentric pressure of 3.26kN, and after reinforcement, the bearing capacity of 19.56kN can be achieved, and the selection is carried out according to the requirement of the bearing capacity.
Example 8
The cement-based profile samples 1#, 2#, 3#, and 4# in examples 4, 5, 6, and 7 were constructed according to the 3D printing method in example 2. The 3D printing method saves other materials such as steel and the like, can naturally form a rough wave surface on the section bar, and is beneficial to the interface bonding performance between cement-based materials. 3D prints and should utilize the 3D printer to carry out the shaping in the mill, encircles the layering and prints, prints the back of accomplishing, and the inside interlayer of section bar is not allowed to take place to slide, and size error control is within 2 mm.
Example 9
Compared with the section bars made of other materials, such as steel section bars, FRP section bars, common concrete prefabricated parts and the like, the cement-based column section bar for the combined concrete column provided by the invention has obvious advantages, and the specific conditions are shown in Table 5.
TABLE 5 comparative advantages of cement-based profiles for use in composite concrete columns provided by the present invention
When the non-reinforced section bar is adopted, the ultimate failure strength of the combined concrete column prepared by using the fiber cement-based column section bar can reach more than 90 percent of that of a common reinforced concrete column; when the reinforced section bar is adopted, a transverse steel bar does not need to be prepared, and the bearing capacity of the reinforced section bar can meet the bearing capacity requirement of a common reinforced concrete column. The combined column shows plastic damage, and the ductility of the combined column is 1.1-1.2 times that of a common concrete column.
In conclusion, the cement-based profile for the combined concrete column and the construction method thereof provided by the invention can be used for quickly constructing the combined concrete column and can be used as a template in construction, so that the construction speed is accelerated, meanwhile, the reasonable selection and combination of the fiber cement-based materials can realize a rib-free structure, are favorable for adopting 3D printing construction, are quick and convenient, and have wide application prospects. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (8)
1. The combined concrete column is characterized by comprising a first section component and a second section component which are in contact, wherein the first section component comprises a plurality of profile main bodies, stiffening ribs and reinforcing bars are arranged in the profile main bodies, the sections of the profile main bodies are an outer covering section and an inner core section, the second section component is a post-cast cement-based material, the first section component is positioned at the outer side and the center of the combined concrete column, and the second section component is positioned between the outer side and the center of the combined concrete column;
the wrapping section is selected from one of a circular section or a round-corner rectangular section;
the profile body having an outer envelope cross-section comprises any one or more of the following conditions:
A1) the profile body with a circular cross-section has dimensions according to formula (1),
the formula (1) is: t is more than or equal to D/20 and less than or equal to D/10,
wherein D is the outer diameter, mm; t is the wall thickness of the profile main body, mm;
A2) the dimension of the profile body with the round-corner rectangular section is calculated according to the formula (2),
the formula (2) is: max { a/20, b/20} < t ≦ max { a/10, b/10},
wherein a is the section length, mm; b is the section width, mm; t is the wall thickness of the profile main body, mm;
A3) when the section of the profile main body is a round-corner rectangular section and the size of the profile main body meets the formula (3), a stiffening rib is arranged on the round-corner rectangular section of the profile main body; when the section of the profile main body is a circular section and the size of the profile main body conforms to the formula (4), the circular section of the profile main body is provided with a stiffening rib,
the formula (3) is: l0/min{a,b}＞8，
Equation (4) is: l0/D＞7，
Wherein l0Is the height of the profile main body, mm; d is the outer diameter, mm; a is the section length, mm; b is the section width, mm;
A4) when the round-corner rectangular cross section of the profile main body is provided with the stiffening rib, the rib width dimension of the stiffening rib accords with a formula (5); when the circular section of the profile main body is provided with the stiffening rib, the width dimension of the stiffening rib accords with the formula (6),
equation (5) is: max { a/8, b/8} < d ≦ max { a/4, b/4},
equation (6) is: 1/8D is not less than D not more than 1/4D,
wherein a is the section length, mm; b is the section width, mm; d is the outer diameter, mm; d is rib width mm;
A5) when the round-angle rectangular section or the round section of the section main body is provided with the stiffening rib, the rib height dimension of the section main body accords with the formula (7), and the formula (7) is as follows: t is more than or equal to 4T and less than or equal to 8T
Wherein T is rib height mm; t is the wall thickness of the profile body, mm.
2. The composite concrete column according to claim 1, wherein the core section is selected from one of an i-section or a cross-section.
3. Composite concrete column according to claim 2, characterised in that said section bar body with core section has dimensions according to formula (8),
equation (8) is: max { a/20, b/20} < t ≦ max { a/10, b/10},
wherein a is the section length, mm; b is the section width, mm; t is the wall thickness of the profile body, mm.
4. Combined concrete column according to claim 2, characterized in that the compressive bearing capacity N of the members in the combined concrete column is for the axial compression conditioncuNot less than the compression of concrete columnBearing capacity N, and the compressive bearing capacity N of the membercuIn accordance with the formula (9),
the formula (9) is: n is a radical ofcu＝fcs·Acs+fc·(A-Acs)+As·fs，
Wherein, N is the compressive bearing capacity of the concrete column calculated according to the arrangement mode of the column, and N; n is a radical ofcuThe compressive bearing capacity of a member in the combined concrete column is N; f. ofcsIs the compressive strength, MPa, of the first segment member; a. thecsIs the cross-sectional area of the first section member, mm2；fcIs the compressive strength, MPa, of the second segment member; a is the total sectional area of the combined concrete column, mm2；AsThe cross-sectional area, mm, of the reinforcing bars in the first section member2；fsThe compressive strength, MPa, of the reinforcing bars in the first segment members;
aiming at the bias working condition, the normal section compressive bearing capacity N of the member in the combined concrete columnuNot less than the compressive bearing capacity N of the concrete column, and the normal section compressive bearing capacity N of the memberuAccording to the formulas (10) and (11),
equation (10) is: n is a radical ofu＝α1fcbx+f′yA′s+N′cs-σsAs-Ncs，
The formula (11) is:
wherein, N is the compressive bearing capacity of the concrete column calculated according to the arrangement mode of the column, and N; n is a radical ofuThe normal section compressive bearing capacity N of a member in the combined concrete column is shown; alpha is alpha1Or a dimensionless reduction factor; f. ofcIs the compressive strength, MPa, of the second segment member; b is the section width of the combined concrete column, mm; x is the height of the cross section compression area of the combined concrete column, and is mm; f'yThe compressive strength of the reinforcement in the section compression area of the combined concrete column in the first section member is MPa; a'sSection for reinforcing bars in section compression zone of combined concrete column in first section memberVolume, mm2；NcsProviding axial tension, N, for the first section member in a tension area of the section of the combined concrete column; sigmasDistributing the tensile stress of the reinforcement in the section tension area of the combined concrete column in the first section member, wherein the tensile stress is MPa; a. thesThe cross section of the reinforcing bars in the tension area of the cross section of the combined concrete column in the first section member is mm2；N′csProviding axial pressure, N, for the first section member in the compression zone of the combined concrete section; e is the eccentricity of the axial force borne by the combined concrete column, mmh0The height of the section of the combined concrete column is mm; a'sThe distance between the edge of the compression area of the section of the combined concrete column and the center of a reinforcement of the compression area is mm; mcsA bending moment, N mm, provided to the first segment member.
5. A cement-based profile for a composite concrete column, wherein the cement-based profile is used as a first section member of the composite concrete column according to any one of claims 1 to 4, and comprises a profile body and a stiffening rib and a reinforcing bar in the profile body, and the section of the profile body is selected from one of an outer-wrapping section and an inner-core section.
6. Use of a cement-based profile according to claim 5 on a composite concrete column.
7. A method of constructing a cement-based profile as claimed in claim 5, selected from one of a prefabricated formwork method or a 3D printing method.
8. A method of constructing a composite concrete column according to any one of claims 1 to 4, comprising the steps of:
A) using the profile with an outer-wrapped section prepared by the method for constructing a cement-based profile according to claim 7 as an outer-wrapped formwork;
B) placing the section with the inner core section prepared by the construction method of the cement-based section according to claim 7 into an outer coating template;
C) and pouring the post-poured cement-based material on the outer coating template, and then forming and maintaining to obtain the combined concrete column.
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