CN116480059A - Ultra-high performance concrete wavy thin arch shell structure and preparation method thereof - Google Patents
Ultra-high performance concrete wavy thin arch shell structure and preparation method thereof Download PDFInfo
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- CN116480059A CN116480059A CN202310502379.5A CN202310502379A CN116480059A CN 116480059 A CN116480059 A CN 116480059A CN 202310502379 A CN202310502379 A CN 202310502379A CN 116480059 A CN116480059 A CN 116480059A
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 238000000034 method Methods 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 239000004567 concrete Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 abstract description 8
- 238000005452 bending Methods 0.000 abstract description 7
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract description 6
- 238000013461 design Methods 0.000 description 7
- 238000004458 analytical method Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 6
- 238000009415 formwork Methods 0.000 description 4
- 238000005034 decoration Methods 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B7/00—Roofs; Roof construction with regard to insulation
- E04B7/08—Vaulted roofs
- E04B7/10—Shell structures, e.g. of hyperbolic-parabolic shape; Grid-like formations acting as shell structures; Folded structures
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention provides an ultra-high performance concrete wavy thin arch shell structure and a preparation method thereof, wherein the ultra-high performance concrete wavy thin arch shell structure comprises the following components: a structural body; any cross section of the structure body is arched, and the contour line of any longitudinal section of the structure body adopts a wavy curve; the profile line of the longitudinal section is provided with a first section and a second section, the first section is outwards protruded along the radial direction of the structural body, the second section is inwards recessed along the radial direction of the structural body, and the first section and the second section are alternately connected in sequence; the radial distance from the vertex of the first section to the end point of the first section is f1, and the projection length of the first section on the axial direction of the structural body is L1, so that f1/L1 is more than or equal to 0.125. So configured, the cross section of the structural body is arched, and under the action of vertical load, the structural body is mainly subjected to bending stress; meanwhile, the contour line of the longitudinal section of the structural body adopts a wavy curve, so that bending moment of inertia is improved, and the tensile stress under the action of vertical load is further reduced, so that the whole structure does not need to be provided with reinforcing steel bars.
Description
Technical Field
The invention relates to the field of building structures, in particular to an ultra-high-performance concrete wavy thin arch shell structure and a preparation method thereof.
Background
The traditional arch shell structure is built by adopting common reinforced concrete, the shell is thick and heavy, the formwork is difficult to support, the steel bar binding work is complicated and the efficiency is low, after the reinforced concrete shell is poured, the surface of the shell is generally required to be subjected to construction of a decorative surface layer, and the procedures are complex and the efficiency is low.
Disclosure of Invention
The invention aims to provide an ultra-high-performance concrete wavy thin arch shell structure and a preparation method thereof, which are used for solving the problems of thick shell, difficult formwork supporting, complex working procedure and low efficiency of the existing arch shell structure.
In order to achieve the above object, the present invention provides an ultra-high performance concrete wavy thin arch shell structure, comprising: a structural body;
any cross section of the structure body is arched, and the contour line of any longitudinal section of the structure body is wavy;
the profile line of the vertical section is provided with a first section and a second section which are alternately connected, the first section is outwards protruded along the radial direction of the structural body, and the second section is inwards recessed along the radial direction of the structural body;
the radial distance from the vertex to the end point of the first section is f1, the projection length of the first section along the axial direction of the structural body is L1, and f1/L1 is more than or equal to 0.125.
Optionally, the radial distance from the vertex to the end point of the second section is f2, the projection length of the second section along the axial direction of the structural body is L2, and f2/L2 is more than or equal to 0.125.
Alternatively, f1=f2.
Alternatively, l1=l2.
Optionally, the structural body is made of ultra-high performance concrete.
Optionally, the span of the cross section of the structural body is 10 m-14 m.
Optionally, the length of the structural body in the radial direction is 40 mm-60 mm.
In order to achieve the above purpose, the invention also provides a preparation method of the ultra-high performance concrete wavy thin arch shell structure, which comprises the following steps:
manufacturing a die based on the size of the ultra-high performance concrete wavy thin arch shell structure;
and preparing the ultra-high performance concrete wavy thin arch shell structure by using the die.
Alternatively, the mold is manufactured using digital molding techniques.
Optionally, the ultra-high performance concrete wavy thin arch shell structure is prepared by adopting a concrete spraying process.
In summary, in the ultra-high performance concrete wavy thin arch shell structure and the preparation method thereof provided by the invention, any cross section of the structure body is arched, so that the structure is mainly subjected to bending stress under the action of vertical load, the contour line of any longitudinal section of the structure body adopts a wavy curve, the bending moment of inertia of the structure body is improved, the tensile stress of the structure under the action of vertical load is further reduced, and the whole structure is free from being provided with reinforcing steel bars; the profile line of the vertical section is provided with a first section and a second section, the first section is outwards protruded along the radial direction of the structural body, the second section is inwards recessed along the radial direction of the structural body, and the first section and the second section are alternately connected in sequence; the radial distance from the vertex of the first section to the end point of the first section is f1, the projection length of the first section in the axial direction of the structural body is L1, the requirement that f1/L1 is more than or equal to 0.125 is met, the whole structure integrates the geometric modeling aesthetic and structural mechanics of the building, and a large-space building is built by combining an arch modeling and a wavy line modeling, so that structural decoration integration is realized.
Drawings
FIG. 1 is a schematic view of a structural body according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of the structural body of FIG. 1;
FIG. 3 is a schematic vertical section of the structural body of FIG. 1;
FIG. 4 is a graph showing the relationship between the peak stress and the sagittal ratio of the first segment according to the present invention;
FIG. 5 is a graph showing the relationship between the peak stress and the sagittal ratio of the second segment according to the present invention;
FIG. 6 is a graph showing the relationship between buckling factor and sagittal ratio of a structure according to an embodiment of the present invention.
Wherein, the explanation of each reference sign is as follows:
1-a structural body; 2-a first stage; 3-second stage.
Detailed Description
The invention will be described in further detail with reference to the drawings and the specific embodiments thereof in order to make the objects, advantages and features of the invention more apparent. It should be noted that the drawings are in a very simplified form and are not drawn to scale, merely for convenience and clarity in aiding in the description of embodiments of the invention. Furthermore, the structures shown in the drawings are often part of actual structures. In particular, the drawings are shown with different emphasis instead being placed upon illustrating the various embodiments.
As used in this specification, the singular forms "a," "an," and "the" include plural referents, the term "or" is generally used in the sense of comprising "and/or" and the term "several" is generally used in the sense of comprising "at least one," the term "at least two" is generally used in the sense of comprising "two or more," and the term "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance or number of technical features indicated. Thus, a feature defining "first," "second," "third," or "third" may explicitly or implicitly include one or at least two such features, with "one end" and "another end" and "proximal end" and "distal end" generally referring to the respective two portions, including not only the endpoints, but also the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, e.g., as being either a fixed connection, a removable connection, or as being integral therewith; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. Furthermore, as used in this specification, an element disposed on another element generally only means that there is a connection, coupling, cooperation or transmission between the two elements, and the connection, coupling, cooperation or transmission between the two elements may be direct or indirect through intermediate elements, and should not be construed as indicating or implying any spatial positional relationship between the two elements, i.e., an element may be in any orientation, such as inside, outside, above, below or on one side of the other element unless the context clearly indicates otherwise. The terms "upper", "lower", "top" and "bottom" are generally relative positional relationships arranged in the direction of gravity; the term "vertical, vertical direction" generally refers to a direction along the force of gravity that is generally perpendicular to the ground, and "horizontal, horizontal direction" generally refers to a direction parallel to the ground; the specific meaning of the above terms in this specification will be understood by those of ordinary skill in the art in view of the specific circumstances.
The invention aims to provide an arch shell structure and a preparation method thereof, which are used for solving the problems of heavy shell, difficult formwork supporting, complex process and low efficiency of the existing arch shell structure.
The following description refers to the accompanying drawings.
Referring to fig. 1 to 3, the present invention provides an ultra-high performance concrete wavy thin arch shell structure, comprising: a structural body 1; any cross section of the structure body 1 is arched, and the contour line of any longitudinal section of the structure body 1 is wavy; the profile line of the longitudinal section is provided with a first section 2 and a second section 3, the first section 2 is outwards protruded along the radial direction of the structural body 1, the second section 3 is inwards recessed along the radial direction of the structural body 1, and the first section 2 and the second section 3 are alternately connected in sequence; the radial distance from the vertex of the first section 2 to the end point of the first section 2 is f1, and the projection length of the first section 2 in the axial direction of the structural body 1 is L1, so that f1/L1 is more than or equal to 0.125. The cross section of the structural body 1 is a cross section perpendicular to the axial direction of the structural body 1, in fig. 1, a cross section in the A-A direction, and the longitudinal section of the structural body 1 is a cross section parallel to the axial direction of the structural body 1, in fig. 1, a cross section in the B-B direction; the axial direction of the structural body 1 extends in the horizontal direction in fig. 3, and the radial direction of the structural body 1 extends in the vertical direction in fig. 3; since the first segment 2 is outwardly convex in the radial direction of the structural body 1, the first segment 2 exhibits a parabolic shape with a downward opening, and thus the vertex of the first segment 2 is the highest point of the first segment 2 in the radial direction of the structural body 1 (the highest point in the vertical direction in fig. 3).
As a preferred embodiment, the distribution density of the first segment 2 and the second segment 3 is expressed by using a "sagittal ratio" as a parameter, and when the sagittal ratio (f 1/L1) is close to 0, that is, when the contour line of the longitudinal section of the structure is relatively flat, the stress of the wavy structure is rapidly reduced along with the increase of the sagittal ratio, and after the sagittal ratio reaches a certain value, the sagittal ratio has less stress influence on the arch shell.
Referring to fig. 4, in an alternative embodiment, taking as an example a wavy shell with a shell thickness of 50mm with a cross-sectional span lt=12m, ft=6m; analyzing the stress influence of the radial distance f1 from the vertex of the first section 2 to the end point of the first section 2 and the ratio f1/L1 of the projection length L1 of the first section 2 on the axial direction of the structural body 1 on the shell, and calculating that when f1/L1 is more than or equal to 0.125, the influence of the change of the sagittal ratio (f 1/L1) on the stress of the shell is small, and the stress of the shell under the combined action of design loads is smaller than the tensile strength of the ultra-high-performance concrete; referring to fig. 6, the influence of the radial distance f1 from the vertex of the first section 2 to the end point of the first section 2 and the ratio f1/L1 of the projection length L1 of the first section 2 on the axial direction of the structural body 1 on the stability of the shell is analyzed, and when f1/L1 is less than 0.125, the buckling factor of the first-order mode of the shell increases with the increase of f1/L1, and when f1/L1 is greater than or equal to 0.125, the buckling factor of the first-order mode of the shell and the curve of f1/L1 gradually decrease; when f1/L1=0.125, the buckling factor of the wavy thin arch shell is 150, the load factor considering geometric nonlinearity, material nonlinearity and initial defects is 11.5, and the stability of the wavy thin arch shell meets the design requirement; based on the conclusion of structural mechanical parameter analysis, the geometric modeling of the building design considers the aesthetic requirement of the building and simultaneously meets the condition that f1/L1 is more than or equal to 0.125, so that the thin arch shell structure without reinforcing steel bars can be realized.
It can be understood by those skilled in the art that the cross section of the structure in this embodiment adopts an arch structure with bending stress as the main component, and the contour line of the vertical section of the structure adopts a wavy line shape to improve the bending moment of inertia of the structure, so that the cross section of the structure is mainly compressive stress and tensile stress is smaller than the tensile strength of the ultra-high performance concrete under the action of vertical load, thereby eliminating the shell steel bar and further realizing the ultra-high performance concrete thin arch shell structure without reinforcement. The structural system combines the geometric modeling aesthetic and structural mechanics of the building, utilizes the arch modeling and the wave modeling to build a large-space building, and realizes the structural decoration integration. In addition, the structure does not need to be provided with reinforcing steel bars, so that the time cost is saved, the manufacturing cost is reduced, and the construction efficiency is improved.
Further, the radial distance from the vertex of the second section 3 to the end point of the second section 3 is f2, and the projection length of the second section 3 in the axial direction of the structural body 1 is L2, so that f2/L2 is more than or equal to 0.125. It should be noted that, since the second section 3 is concave along the radial direction of the structural body 1, the second section 3 presents a parabolic shape with an upward opening, so that the vertex of the second section 3 is the lowest point of the second section 3 in the axial direction of the structural body 1 (the lowest point in the vertical direction in fig. 3). As an alternative embodiment, please refer to fig. 5, still taking a wave-shaped shell with a shell thickness of 50mm as an example, with a cross-sectional span lt=12m, ft=6m; the stress influence of the second section 3 to the shell and the influence of the second section 3 to the stability of the shell are sequentially analyzed, namely, the analysis result similar to the first section 2 is obtained, namely, based on the conclusion of structural mechanical parameter analysis, the geometric modeling of the building design considers the aesthetic requirement of the building and simultaneously meets the condition that f2/L2 is more than or equal to 0.125, and then the thin arch shell structure without reinforcing steel bars can be realized. It will be appreciated by those skilled in the art that if different cross-sectional parameters and parameters of the shell thickness are used, there may be a certain difference in the threshold value of the resulting sagittal ratio, and those skilled in the art may calculate the threshold value of the sagittal ratio according to the parameter configuration of the specific structural body 1, which is not limited in this embodiment.
Referring to fig. 3, in an alternative embodiment, f1=f2; l1=l2. In the example shown in fig. 3, the contour line of the longitudinal section of the structural body 1 has three first sections 2 and three second sections 3, and the parameters of the first sections 2 and the second sections 3 are equal and are alternately connected in sequence. It will be appreciated by those skilled in the art that, based on analysis of structural mechanical parameters and analysis of architectural geometry aesthetics, the profile of the longitudinal section of the structural body 1 has a morphology that is symmetrical along the axial direction of the structural body 1, and in some other embodiments, the number of first segments 2 and second segments 3 may be fewer or greater, and the profile of the longitudinal section may be not completely symmetrical with respect to the axial direction of the structural body 1, depending on the span of the structural body 1 and the configuration of the parameters of the respective sections, which may be flexibly configured by those skilled in the art.
As an alternative embodiment, the structural body 1 is made of ultra-high performance concrete. As can be appreciated by those skilled in the art, the ultra-high performance concrete (UHPC) has stronger durability and higher mechanical properties than the normal concrete (NSC), and can reduce the cost of post-maintenance reinforcement while guaranteeing the strength of the structural body 1, and at the same time, the thickness of the structural body 1 can be further reduced relative to the normal concrete shell due to the influence of the high mechanical properties of the ultra-high performance concrete (UHPC), so that the construction cost is reduced, and the defect of heavy and difficult formwork supporting of the traditional arch shell structural shell is overcome. In other embodiments, the person skilled in the art may also use other materials with high mechanical properties to prepare the structural body 1 to reduce the thickness of the shell according to the actual situation, which is not limited in this embodiment.
As an alternative embodiment, the cross section of the structural body 1 spans 10 m-14 m. In the examples shown in fig. 1 to 2, the cross section of the structural body 1 is A-A section, the cross section of the structural body 1 has a span Lt, and those skilled in the art will understand that, considering the stability of the building structure and the aesthetic of geometric modeling of the building, the thin arch shell structure is usually formed by spraying concrete on site, and is particularly applied to a space structure with a span of about 10m, such as a rest post in a small exhibition hall or park.
In some alternative embodiments, the thickness of the structural body 1 in the radial direction thereof is 40mm to 60mm. In the process of analyzing the structural mechanics of the geometric parameters of the structural body 1, the structural body 1 is subjected to building modeling design within the range of structural preferable parameters, for example, the span of the structural body 1 is 10-14 m, the thickness of the structural body 1 is 40-60 mm, so that the ultra-high performance concrete wavy thin arch shell structure with unified building modeling aesthetic and structural mechanics is realized, the stress of the structure is smaller than the strength of the ultra-high performance concrete under the design load, and the stability of the thin arch shell meets the design requirement.
In order to achieve the above purpose, the present invention further provides a method for preparing an ultra-high performance concrete wavy thin arch shell structure, which is used for preparing the ultra-high performance concrete wavy thin arch shell structure, and is characterized in that the method for preparing the ultra-high performance concrete wavy thin arch shell structure comprises:
step S1: manufacturing a die based on the size of the ultra-high performance concrete wavy thin arch shell structure;
step S2: the ultra-high performance concrete wavy thin arch shell structure is prepared by using an injection process based on a die.
In the process of preparing the ultra-high performance concrete wavy thin arch shell structure, a person skilled in the art needs to determine a structure preferable parameter range according to the result of mechanical parameter analysis, determine the structure parameters of the wavy arch shell structure in the structure preferable parameter range according to the actual situation, and manufacture a corresponding mold; meanwhile, in the process of manufacturing the mould, the loss of concrete during manufacturing and the difference between the concrete before and after curing are considered.
As a preferred embodiment, the mold is manufactured using digital molding techniques. The digital molding technology is to control the mold processing by using digital information, so that the manufacturing quality and precision of the mold can be improved, and the method is suitable for manufacturing the complex-modeling curved surface building mold. When concrete is sprayed, a mold is needed to make the size and profile of the arch shell structure more accurate.
In an alternative embodiment, the ultra-high performance concrete wavy thin dome structure is prepared using a concrete spraying process. As can be appreciated by those skilled in the art, compared with the ordinary concrete construction process, the concrete spraying process has the advantages of high construction speed, flexibility and variability in construction operation modes, capability of manufacturing structures with thin walls or complex shapes in any direction in high altitude, deep pits or narrow working areas, small occupied area, flexibility and mobility, and convenience in manufacturing irregular members as in the embodiment. As an alternative embodiment, a single-sided mold spray concrete may be used to produce ultra-high performance concrete wavy thin dome structures.
In summary, in the ultra-high performance concrete wavy thin arch shell structure and the preparation method thereof provided by the embodiment of the invention, the ultra-high performance concrete wavy thin arch shell structure comprises: a structural body; any cross section of the structure body is arched, and the contour line of any longitudinal section of the structure body adopts a wavy curve; the profile line of the vertical section is provided with a first section and a second section, the first section is outwards protruded along the radial direction of the structural body, the second section is inwards recessed along the radial direction of the structural body, and the first section and the second section are alternately connected in sequence; the radial distance from the vertex of the first section to the end point of the first section is f1, and the projection length of the first section in the axial direction of the structural body is L1, so that f1/L1 is more than or equal to 0.125.
The cross section of the structure body is arched, so that the structure is mainly stressed by buckling under the action of vertical load; meanwhile, the contour line of the longitudinal section of the structure body adopts a wave-shaped curve, so that the bending moment of inertia of the structure body is improved, the tensile stress of the structure under the action of vertical load is further reduced, and the whole structure does not need to be provided with reinforcing steel bars; in addition, the whole structure integrates the geometric modeling aesthetic and structural mechanics of the building, and combines the arch modeling and the wavy line modeling to build a large-space building, thereby realizing structural decoration integration.
The above description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.
Claims (10)
1. An ultra-high performance concrete wavy thin arch shell structure, comprising: a structural body;
any cross section of the structure body is arched, and the contour line of any longitudinal section of the structure body is wavy;
the profile line of the vertical section is provided with a first section and a second section which are alternately connected, the first section is outwards protruded along the radial direction of the structural body, and the second section is inwards recessed along the radial direction of the structural body;
the radial distance from the vertex to the end point of the first section is f1, the projection length of the first section in the axial direction of the structural body is L1, and f1/L1 is more than or equal to 0.125.
2. An ultra-high performance concrete wavy thin arch shell structure according to claim 1, wherein the radial distance from the vertex to the end point of the second section is f2, the projection length of the second section in the axial direction of the structural body is L2, and f2/L2 is not less than 0.125.
3. A waved thin shell structure of ultra-high performance concrete according to claim 2, wherein f1=f2.
4. An ultra-high performance concrete wavy thin arch shell structure according to claim 2, wherein l1=l2.
5. An ultra-high performance concrete wavy thin arch shell structure according to claim 1, wherein the structural body is made of ultra-high performance concrete.
6. An ultra-high performance concrete wavy thin arch shell structure according to claim 1, wherein the cross section of the structural body spans 10 m-14 m.
7. An ultra-high performance concrete wavy thin arch shell structure according to claim 1, wherein the length of the structural body in the radial direction thereof is 40 mm-60 mm.
8. A method of making an ultra-high performance concrete wavy thin arch shell structure as defined in any one of claims 1 to 7, comprising:
manufacturing a die based on the size of the ultra-high performance concrete wavy thin arch shell structure;
and preparing the ultra-high performance concrete wavy thin arch shell structure by using the die.
9. A method of manufacturing a corrugated thin arch shell structure of ultra-high performance concrete as recited in claim 8, wherein said mold is manufactured using digital molding techniques.
10. A method of manufacturing an ultra-high performance concrete wavy thin dome structure in accordance with claim 8, wherein the ultra-high performance concrete wavy thin dome structure is manufactured using a concrete spraying process.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310502379.5A CN116480059A (en) | 2023-05-06 | 2023-05-06 | Ultra-high performance concrete wavy thin arch shell structure and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310502379.5A CN116480059A (en) | 2023-05-06 | 2023-05-06 | Ultra-high performance concrete wavy thin arch shell structure and preparation method thereof |
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| CN116480059A true CN116480059A (en) | 2023-07-25 |
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| CN202310502379.5A Pending CN116480059A (en) | 2023-05-06 | 2023-05-06 | Ultra-high performance concrete wavy thin arch shell structure and preparation method thereof |
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