CN215948469U - Joint column base structure of double steel columns - Google Patents
Joint column base structure of double steel columns Download PDFInfo
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- CN215948469U CN215948469U CN202121521813.7U CN202121521813U CN215948469U CN 215948469 U CN215948469 U CN 215948469U CN 202121521813 U CN202121521813 U CN 202121521813U CN 215948469 U CN215948469 U CN 215948469U
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Abstract
The utility model discloses a double-steel-column combined column base structure and a construction method thereof. The double-steel-column combined column base structure comprises a bottom plate, a first steel column, a second steel column and a connecting plate, wherein the first steel column and the second steel column are arranged on the bottom plate at intervals, an expansion joint is formed between the first steel column and the second steel column, the connecting plate is connected to one ends, close to the bottom plate, of the first steel column and the second steel column, and the connecting plate is located in the expansion joint. This scheme of adoption, when first steel column and second steel column received the moment of flexure or the shearing force effect of equidirectional, can utilize the rigidity stack effect of first steel column and second steel column, reduced the stress of column base bottom plate and column base crab-bolt to can avoid column base bottom plate and column base crab-bolt because of stress concentration the cracked condition probably appears. When the first steel column and the second steel column are subjected to bending moment or shearing force in opposite directions, the force applied to the first steel column and the second steel column can be reduced through the connecting plate, and the safety of the first steel column and the safety of the second steel column are guaranteed.
Description
Technical Field
The utility model relates to the technical field of steel column base structures, in particular to a double-steel-column combined base structure.
Background
Expansion joints of building structures are often designed into double columns, the expansion joints between the double columns are about 200mm generally, and the column bases of the double columns cannot be independent according to the size and need to be designed into double-column combined column bases. In the related art, the double-column combined column base is mainly formed by directly welding a steel column with a column base bottom plate, and columns above the column base bottom plate are independent. The method can not realize common stress of the double columns and can not exert the advantage of rigidity superposition of the double columns.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model discloses a double-steel-column joint column base structure, which exerts the advantage of double-column rigidity superposition and improves the economy, safety and easy implementation when the double-steel-column base at an expansion joint is designed in a joint mode.
In order to achieve the purpose, the utility model discloses a double-steel-column combined column base structure which comprises
A base plate;
the first steel column is arranged on the bottom plate;
the second steel column is arranged on the bottom plate, and the second steel column and the first steel column are arranged at intervals to form an expansion joint between the second steel column and the first steel column;
the connecting plate is connected to one ends, close to the bottom plate, of the first steel column and the second steel column, and the connecting plate is located in the expansion joint.
As an alternative implementation manner, in an embodiment of the present invention, the number of the connecting plates is two, and the two connecting plates are respectively connected to two sides of the first steel column and the second steel column;
the connecting plate is provided with a connecting surface back to the expansion joint, the first steel column is provided with a first surface, the second steel column is provided with a second surface, the first surface is flush with the second surface, and the connecting surface is flush with the first surface and the second surface.
As an alternative embodiment, in an embodiment of the present invention, a shape of the first steel column, which is cut along a plane perpendicular to a height direction of the first steel column, is a first rectangle having a first long side and a first short side, and a shape of the second steel column, which is cut along a plane perpendicular to a height direction of the second steel column, is a second rectangle having a second long side and a second short side;
the height h of the connecting plate is (1.3-1.7) d1+ (1.0-1.6) d 2;
wherein d1 is the maximum of the first long side, the first short side, the second long side, and the second short side; d2 is the width of the expansion joint.
As an alternative, in the embodiment of the present invention, the top end of the connecting plate is provided with a groove, and the groove is used for dispersing the stress applied to the connecting plate.
As an alternative, in the embodiment of the present invention, the width of the groove is gradually decreased from the top end of the connecting plate to the bottom end of the connecting plate.
As an alternative implementation manner, in an embodiment of the present invention, the double-steel-column combined column base structure further includes an inter-column ring plate, and the inter-column ring plate is sleeved on the peripheries of the first steel column and the second steel column.
As an alternative implementation manner, in an embodiment of the present invention, the inter-column ring plate is sleeved at a position where the peripheries of the first steel column and the second steel column correspond to the top end of the connecting plate, and a projection of an upper edge of the inter-column ring plate on the connecting plate is located below the groove.
As an alternative embodiment, in the embodiment of the present invention, the height of the inter-column ring plate is (0.2-0.3) × d1, and the thickness of the inter-column ring plate is the same as the wall thickness of the first steel column and the second steel column;
wherein the first steel column is shaped as a first rectangle having a first long side and a first short side, the second steel column is shaped as a second rectangle having a second long side and a second short side, the second rectangle being cut along a plane perpendicular to the height direction of the second steel column; d1 is the maximum of the first long side, the first short side, the second long side, and the second short side.
As an optional implementation manner, in an embodiment of the present invention, a plurality of first pegs and a plurality of second pegs are respectively disposed on surfaces of the first steel column and the second steel column facing the expansion joint, the plurality of first pegs are disposed at intervals along a height direction of the first steel column, the plurality of second pegs are disposed at intervals along a height direction of the second steel column, and each first peg is disposed corresponding to each second peg;
first concrete is poured in the expansion joint, the pouring height of the first concrete in the expansion joint is close to or flush with the upper edge of the inter-column ring plate, and the first concrete covers the first studs and the second studs.
As an alternative implementation manner, in an embodiment of the present invention, the first steel column and the second steel column are respectively cast with second concrete and third concrete, and the casting heights of the second concrete and the third concrete in the first steel column and the second steel column are close to or flush with the upper edge of the inter-column ring plate.
Compared with the prior art, the utility model has the beneficial effects that:
according to the double-steel-column combined column base structure provided by the embodiment of the utility model, the connecting plate is arranged in the expansion joint formed between the first steel column and the second steel column, and the connecting plate is used for connecting the first steel column and the second steel column, so that the first steel column and the second steel column can be continuously stressed, and when the first steel column and the second steel column are subjected to bending moment or shearing force in the same direction, the rigidity superposition effect of the first steel column and the second steel column can be utilized, the stress of a column base plate and a column base anchor bolt is reduced, and the situation that the column base plate and the column base anchor bolt are possibly broken due to stress concentration can be avoided. When the first steel column and the second steel column are subjected to bending moment or shearing force in opposite directions, the stress at the roots of the first steel column and the second steel column can be reduced by the connecting plate, and the safety of the first steel column and the second steel column is guaranteed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a three-dimensional effect diagram of a double-steel-column combined column base structure disclosed by an embodiment of the utility model;
FIG. 2 is a plan view of a dual steel column joint column base structure according to an embodiment of the utility model;
FIG. 3 is a sectional view A-A of the combined column base structure of the double steel columns disclosed by the embodiment of the utility model;
FIG. 4 is an enlarged view of the area M in FIG. 2;
FIG. 5 is a bending moment diagram of a web groove;
FIG. 6 is a finite element analysis diagram of a dual steel column shoe structure in the related art;
FIG. 7 is a finite element analysis diagram of a dual-steel-column combined column base structure disclosed by the embodiment of the utility model;
fig. 8 is a flowchart of a construction method of a double-steel-column combined column base structure disclosed by the embodiment of the utility model.
Icon: 10. a double-steel-column combined column base structure; 11. a base plate; 12. a first steel column; 121. a first wall surface; 122. a first surface; 12a, second concrete; 13. a second steel column; 131. a second wall surface; 132. a second surface; 13a, third concrete; 14. a connecting plate; 141. a connecting surface; 14a, a groove; 14b, top end; 14c, bottom end; 15. an expansion joint; 15a, first concrete; 16. a column shoe anchor bolt; 17. an inter-column ring plate; 18. a first stud; 19. a second peg.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "center", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the utility model and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
Furthermore, the terms "first," "second," and the like, are used primarily to distinguish one device, element, or component from another (the specific nature and configuration may be the same or different), and are not used to indicate or imply the relative importance or number of the indicated devices, elements, or components. "plurality" means two or more unless otherwise specified.
In the related art, in order to prevent the building element from expanding with heat and contracting with cold due to the change of the climate and temperature, and causing the structure to crack or be damaged, an expansion joint is arranged at a proper position along the construction joint direction of the building or the building element in the construction process. The expansion joint divides a building element above the foundation, such as a floor slab, into two separate sections, with the floor slab being supported primarily by steel columns. Therefore, the expansion joints of the building structure are often designed as double steel columns to support two building components respectively. However, in this way, each steel column supports the building component independently, and this way cannot realize the common stress of the double steel columns, and cannot exert the advantage of the rigidity superposition of the double steel columns.
Based on this, this application discloses a joint column foot structure of two steel columns. Through set up the connecting plate in the expansion joint that forms between first steel column and second steel column to make the connecting plate couple together first steel column and second steel column, make the atress between first steel column and the second steel column continuous. The advantage of common stress and rigidity superposition of the double steel columns can be realized, and the safety of the first steel column and the second steel column is guaranteed.
The technical solution of the present invention will be further described with reference to the following embodiments and the accompanying drawings.
In a first aspect, referring to fig. 1 to 4 together, the present invention provides a dual-steel-column combined column base structure 10, which includes a bottom plate 11, a first steel column 12, a second steel column 13 and a connecting plate 14. The first steel column 12 is arranged on the bottom plate 11; the second steel column 13 is disposed on the bottom plate 11, and the second steel column 13 and the second steel column 12 are disposed at an interval to form an expansion joint 15 therebetween. The connecting plate 14 is connected to one ends of the first steel column 12 and the second steel column 13 close to the bottom plate 11, and the connecting plate 14 is located in the expansion joint 15.
It can be understood that, since the first steel column 12 and the second steel column 13 are both disposed on the bottom plate 11, the bases of the first steel column 12 and the second steel column 13 are both fixed on the bottom plate 11 by the base anchor 16. Specifically, the column shoe anchor 16 may be plural, and the plural column shoe anchors 16 may be provided at intervals along the outer peripheries of the first steel column 12 and the second steel column 13.
By providing the connecting plate 14 in the expansion joint 15 formed between the first steel column 12 and the second steel column 13 and connecting the first steel column 12 and the second steel column 13 by the connecting plate 14, the stress between the first steel column 12 and the second steel column 13 can be made continuous. When the first steel column 12 and the second steel column 13 are subjected to bending moment or shear force in the same direction, the stress of the bottom plate 11 and the column base anchor bolt 16 can be reduced by utilizing the rigidity superposition effect of the first steel column 12 and the second steel column 13, so that the situation that the bottom plate 11 and the column base anchor bolt 16 are likely to break due to stress concentration can be avoided. When the first steel column 12 and the second steel column 13 are subjected to bending moment or shearing force in opposite directions, due to the connection effect of the connecting plate 14, the first steel column 12, the second steel column 13 and the connecting plate 14 form an integral stress structure, so that stress in opposite directions can be mutually offset, stress at the roots of the first steel column 12 and the second steel column 13 is reduced, and safety of the first steel column 12 and the second steel column 13 is ensured.
That is to say, the joint column base structure 10 with two steel columns provided in this embodiment realizes the common stress and rigidity stacking advantages of the first steel column 12 and the second steel column 13, solves the problem that it is difficult to accurately analyze the actual action condition of the respective stress of the steel columns on the column bases of the steel columns under various working conditions, and improves the safety of the engineering.
In some embodiments, the first steel column 12 and the second steel column 13 are box-shaped steel columns, that is, the first steel column 12 is shaped as a first rectangle along a plane perpendicular to the height direction of the first steel column 12, and the second steel column 13 is shaped as a second rectangle along a plane perpendicular to the height direction of the second steel column 13. The area of the second rectangle may be the same as the area of the first rectangle, that is, the first steel column 12 and the second steel column 13 may be steel columns with the same volume, and the wall thicknesses of the first steel column 12 and the second steel column 13 are the same. It is understood that in other embodiments, the first steel column 12 and the second steel column 13 may also be circular steel columns, H-shaped steel columns, and the like.
Further, when the first steel column 12 and the second steel column 13 are disposed at an interval, the first steel column 12 has a first wall surface 121, the second steel column 13 has a second wall surface 131, the second wall surface 131 and the first wall surface 121 are disposed at an interval to form the expansion joint 15, and the connecting plate 14 can be connected to the first wall surface 121 and the second wall surface 131, so that the first steel column 12 and the second steel column 13 are connected by the connecting plate 14, and the stress of the first steel column 12 and the second steel column 13 can be transmitted through the connecting plate 14.
In some embodiments, the material of the connecting plate 14 is a steel plate, and the connecting plate 14 can be fixed to the first wall 12 and the second wall 13 by welding. It can be understood that the connection reliability of the connection plate 14 and the first steel column 12 and the second steel column 13 can be effectively ensured by adopting a welding fixing mode. It is understood that in other embodiments, the connecting plate 14 can be fixed to the first steel column 12 and the second steel column 13 by screws.
Further, there are two connecting plates 14, and the two connecting plates 14 are connected to both sides of the first steel column 12 and the second steel column 13, respectively. The connecting plate 14 has a connecting surface 141 facing away from the expansion joint 15, the first steel column 12 has a first surface 122, the first surface 122 is adjacent to the first wall 121, the second steel column 13 has a second surface 132, the second surface 132 is adjacent to the second wall 131, the first surface 122 is flush with the second surface 132, and the connecting surface 141 is flush with the first surface 122 and the second surface 132. Through the mode that all is connected with this connecting plate 14 in the both sides of first steel column 12, second steel column 13 respectively, and the connecting surface 141 of connecting plate 14 flushes with first surface 122 and second surface 132, the transmission effect of power is better between first steel column 12 and the second steel column 13, is favorable to guaranteeing the security of first steel column 12 and second steel column 1.
That is, the connecting surface 141 of the connecting plate 14 is flush with the first surface 122 and the second surface 132, and when the first steel column 12 is subjected to an external force, the force can be directly transmitted to the second surface 132 of the second steel column 13 through the connecting plate 14; similarly, when the second steel column 13 is subjected to an external force, the force can be directly transmitted to the first surface 122 of the first steel column 12 through the connecting plate 14. The acting force transmission route is simple and direct. If the connecting plate 14 is disposed in the expansion joint between the first steel column 12 and the second steel column 13 and the connecting surface 141 of the connecting plate 14 is not flush with the first surface 122 and the second surface 132, when the first steel column 12 or the second steel column 13 is subjected to a large stress, the first wall surface 121 or the second wall surface 131 may be bent, which affects the safety of the dual-steel-column combined column foot structure.
In some embodiments, the first steel column 12 is shaped as a first rectangle cut along a plane perpendicular to the height direction of the first steel column 12, the second steel column 13 is shaped as a second rectangle cut along a plane perpendicular to the height direction of the second steel column 13, the first rectangle has a first long side a and a first short side b, the second rectangle has a second long side c and a second short side d, and the height h ═ d (1.3-1.7) of the connecting plate 141+(1.0～1.6)*d2. Wherein d is1Is the maximum value among the first long side a, the first short side b, the second long side c and the second short side d; d2The width of the expansion joint 15.
For example, when the first long side a is the largest among the first long side a, the first short side b, the second long side c and the second short side d, d is1The value of the first long side a; and when the second long side c is the largest among the first long side a, the first short side b, the second long side c and the second short side d, d is1The value of the second long side c. It can be understood that the width d of the expansion joint 152The distance between the first steel column 12 and the second steel column 13 can be determined according to the actual construction process.
Considering that the height of the connecting plate 14 needs to be within a proper range, the connecting effect of the connecting plate 14 on the first steel column 12 and the second steel column 13 can be fully exerted, and the advantages of common stress and rigidity superposition of the first steel column 12 and the second steel column 13 are achieved. For example, if the connecting plate 14, the transmission effect of the force between the first steel column 12 and the second steel column 13 is poor, and when the first steel column 12 and the second steel column 13 are subjected to bending moment or shearing force in the same direction, the rigidity superposition effect between the first steel column 12 and the second steel column 13 is poor; if the height of connecting plate 14 is higher, will cause the waste of material, increase construction cost, because the atress of first steel column 12 and second steel column 13 mainly concentrates on bottom plate 11 and steel column base position, for reducing construction cost, the connecting plate height need not to set up too high. Thus, by d above1、d2The height of the connecting plate 14 is limited, the connecting effect of the connecting plate 14 on the first steel column 12 and the second steel column 13 can be realized on the premise of reasonably utilizing construction materials, and the advantages of common stress and rigidity superposition of the first steel column 12 and the second steel column 13 are exerted.
In some embodiments, the thickness of the connecting plate 14 may be approximately equal to the wall thickness of the first and second steel columns 12, 13. On one hand, when the connecting plate 14 is connected between the first steel column 12 and the second steel column 13, the stress transmitted from the connecting plate 14 to the second steel column 13 of the first steel column 12 is continuous, and the force transmission between the first steel column 12 and the second steel column 13 is facilitated; on one hand, since the thickness of the connecting plate 14 is approximately equal to the wall thickness of the first steel column 12 and the second steel column 13, the connection of the connecting plate 14 is more reliable when the connecting plate 14 is connected to the first steel column 12 and the second steel column 13 by welding.
In some embodiments, the connecting plate 14 extends upward from the ends of the first and second steel columns 12, 13 connected to the bottom plate 11 when connected between the first and second steel columns 12, 13. In other words, the connecting plate 14 has a height direction corresponding to the height direction of the first steel column 12 and the second steel column 13, so that the connecting plate 14 has a top end 14b and a bottom end 14c opposite to each other, the bottom end 14c of the connecting plate 14 can be connected to the bottom plate 11, the first steel column 12 and the second steel column 13 can be connected to two sides of the bottom end 14c of the connecting plate 14, respectively, and the top end 14b of the connecting plate 14 is provided with a groove 14a, and the groove 14a can be used for dispersing the stress applied to the connecting plate 14.
Specifically, referring to fig. 5, when the first steel column 12 and the second steel column 13 are subjected to the horizontal shearing force, the bending moment applied to the portions of the first steel column 12 and the second steel column 13 closer to the root (i.e., the column foot) is larger, and therefore, the groove 14a is formed in the top end 14b of the connecting plate 14, which is equivalent to adding the armpit to the root of the first steel column 12 and the root of the second steel column 13, so that the stress applied to the root is uniformly distributed as much as possible, and the stress concentration at the root is relieved. That is, when the steel column is subjected to shearing force, the bending moment increases toward the root, and the groove 14a formed in the connecting plate 14 corresponds to the addition of a lug at the root. After the root is haunched, the cross section of the connecting plate 14 is larger towards the root, the bending moment of the connecting plate 14 is larger and larger, the bending moment of the steel column is changed correspondingly, the stress on the root is smaller than the stress without haunching, and the purpose of relieving the stress concentration of the root is achieved.
Specifically, the grooves 14a are grooved from both sides of the top end 14b of the connection plate 14, that is, the grooves 14a penetrate both sides of the top end 14b of the connection plate 14, and the width of the grooves 14a gradually decreases from the top end 14b of the connection plate 14 toward the bottom end 14c of the connection plate 14. That is, the width of the groove 14a is larger near the top end 14b of the connection plate 14, and since the groove 14a penetrates both sides of the top end 14b of the connection plate 14, the width of the groove 14a at the top end 14b of the connection plate 14 is substantially equal to the width of the connection plate 14, and the width of the groove is smaller at a position away from the top end 14b of the connection plate 14. It will be appreciated that the width of the groove 14a decreases from the top end 14b of the connector plate 14 toward the bottom end 14c of the connector plate 14, indicating that the cross-sectional area of the groove 14a in a direction perpendicular to the height of the first steel column 12 increases from the top end 14b of the connector plate 14 toward the bottom end 14c of the connector plate 14. Thus, the web 14 experiences an increasing bending moment, which corresponds to a change in the bending moment of the steel columns, which relieves root stress concentrations.
Further, the depth of the groove 14a may be (1.0-1.6) × d2. For example, the depth of the groove 14a may be 1.0d2、1.1d2、1.2d2、1.3d2、1.4d2、1.5d2Or 1.6d2And the like. Wherein d is2The width of the expansion joint 15. It will be appreciated that the depth of the groove 14a is determined by the shape of the groove 14a, and from the foregoing, the width of the groove 14a is determined from the top end 14b of the web 14Gradually decreases in the direction toward the bottom end 14c of the connecting plate 14, that is, the cross-sectional area of the groove 14a in the direction perpendicular to the height direction of the first steel column 12 gradually increases from the top end 14b of the connecting plate 14 toward the bottom end 14c of the connecting plate 14, and the greater the increase in the cross-sectional area of the groove 14a, the shallower the depth of the groove 14 a; the smaller the increase in the cross-sectional area of the groove 14a, the deeper the depth of the groove 14 a. That is, when the variation width of the cross-sectional area of the groove 14a in the direction perpendicular to the height direction of the first steel column 12 gradually increases from the top end 14b of the connecting plate 14 to the bottom end 14c of the connecting plate 14 is larger, the depth of the groove 14a is smaller, the magnitude of the stress applied to the connecting plate 14 from the top end 14b to the bottom end 14c changes faster, and the effect on relieving the stress concentration at the root is smaller; conversely, when the variation width of the cross-sectional area of the groove 14a in the direction perpendicular to the height direction of the first steel column 12 gradually increases from the top end 14b of the connecting plate 14 to the bottom end 14c of the connecting plate 14 is smaller, the depth of the groove 14a is larger, the magnitude of stress applied to the connecting plate 14 from the top end 14b to the bottom end 14c changes more slowly, and the effect of relieving the root stress concentration is more remarkable, but the larger the depth of the groove 14a is, the larger the height of the connecting plate 14 is, the more material is required. Therefore, the present embodiment limits the range of the groove 14a to a suitable range, i.e., (1.0-1.6) × d2The stress relieving effect of the groove 14a on the roots of the first steel column 12 and the second steel column 13 can be effectively ensured.
Alternatively, the shape of the groove 14a taken along a plane parallel to the height direction of the connecting plate 14 may be a right trapezoid, an isosceles trapezoid, a U-shape, a V-shape, or the like, as long as the width of the groove 14a is gradually reduced from the top end 14b of the connecting plate 14 to the bottom end 14c of the connecting plate 14, and this embodiment is not particularly limited.
Referring again to fig. 1 and 3, in some embodiments, the dual-steel-column combined column foot structure 10 further includes an inter-column ring plate 17, and the inter-column ring plate 17 is sleeved on the outer peripheries of the first steel column 12 and the second steel column 13. Specifically, the inter-column ring plate 17 may be welded to the peripheries of the first steel column 12 and the second steel column 13, so that the connection between the inter-column ring plate 17 and the first steel column 12 and the second steel column 13 may be more reliable. The stability of the double-steel-column combined column base structure 10 can be further strengthened by sleeving the inter-column ring plate 17 on the peripheries of the first steel column 12 and the second steel column 13, so that the rigidity superposition advantage of the first steel column 12 and the second steel column 13 can be better realized.
Further, the inter-column ring plate 17 is sleeved on the outer peripheries of the first steel column 12 and the second steel column 13 at a position corresponding to the top end 14b of the connecting plate 14, and the projection of the upper edge of the inter-column ring plate 17 on the connecting plate 14 is located below the groove 14 a. It is understood that the cross-sectional area of the groove 14a in the direction perpendicular to the height direction of the first steel column 12 gradually increases from the top end 14b of the connecting plate 14 toward the bottom end 14c of the connecting plate 14, and the bending moment applied to the groove 14a also gradually increases from the top end 14b of the connecting plate 14 toward the bottom end 14c of the connecting plate 14 in the direction perpendicular to the height direction of the first steel column 12, and at this time, the force applied below the groove 14a is the greatest. Therefore, the upper edge of the inter-column ring plate 17 is sleeved at the lower positions of the first steel column 12 and the second steel column 13 corresponding to the grooves 14a, which is more beneficial to relieving the bending moment of the first steel column 12 and the second steel column 13 at the root.
As can be seen from the foregoing, the inter-column ring plate 17 is fitted around the outer peripheries of the first and second steel columns 12, 13, and the height direction of the inter-column ring plate 17 coincides with the height direction of the first and second steel columns 12, 13. The height of the inter-column ring plate 17 is (0.2-0.3) × d1E.g. 0.2d1、0.25d1、0.3d1And the like. Wherein d is1Is the maximum value among the first long side a, the first short side b, the second long side c, and the second short side d. For example, when the first long side a is the largest among the first long side a, the first short side b, the second long side c, and the second short side d, d is larger1Is the value of the first long side a; and when the second long side c is the largest among the first long side a, the first short side b, the second long side c and the second short side d, d is1Is the value of the second long side c.
It can be understood that if the height of the inter-column ring plate 17 is lower, the stress area is smaller, and the stress effect of the inter-column ring plate 17 is not good; and the higher the height of the inter-column ring plate 17 is, the larger the stress area is, and the better the stress effect is. However, if the height of the inter-column ring plate 17 exceeds the above-defined height range, the force-receiving effect is not greatly changed, so thatThe inter-post ring plate 17 is too high and causes waste of material. Therefore, in order to ensure good stress and save construction cost, the height of the inter-column ring plate 17 is limited within a certain range, namely the height of the inter-column ring plate 17 is limited to (0.2-0.3) × d1。
Alternatively, the thickness of the inter-column ring plate 17 may be substantially equal to the wall thickness of the first and second steel columns 12, 13. In this way, the stress of the inter-column ring plate 17 is more reasonable. That is, the thickness of the inter-column ring plate 17 is as thick as the column walls of the first and second steel columns 12 and 13, and the section strength of the inter-column ring plate 17 is calculated by the column bottom shear force to be equal to the section strength of the column walls of the first and second steel columns 12 and 13. Therefore, the effect of transferring stress to the inter-column ring plate 17 by the first steel column 12 and the second steel column 13 is better, so that the stress of the double-steel-column combined column base structure 10 is more reasonable.
In some embodiments, the inter-column ring plate 17 is made of a steel plate, and the inter-column ring plate 17 is fixed by welding. It can be understood that the fixing manner by welding can effectively ensure the connection reliability of the inter-column ring plate 17 with the first steel column 12 and the second steel column 13. It is understood that in other embodiments, the inter-column ring plate 17 may be fixed to the first and second steel columns 12 and 13 by means of screws.
In some embodiments, the first steel column 12 and the second steel column 13 are respectively provided with a plurality of first pegs 18 and a plurality of second pegs 19 on the surfaces facing the expansion joint 15, that is, the first wall surface 121 and the second wall surface 131 are respectively provided with a plurality of first pegs 18 and a plurality of second pegs 19. Wherein, a plurality of first pegs 18 are arranged along the height direction of the first steel column 12 at intervals, a plurality of second pegs 19 are arranged along the height direction of the second steel column 13 at intervals, and each first peg 18 is arranged corresponding to each second peg 19. Specifically, the distance between the first peg 18 and the second peg 19 in the vertical direction (i.e. the height direction of the first steel column 12 and the second steel column 13) is 170 and 230mm, for example, the distance between the first peg 18 and the second peg 19 in the vertical direction may be 170mm, 180mm, 190mm, 200mm, 210mm, 220mm, 230mm, etc.; the first peg 18 and the second peg 19 may be spaced apart by 50-500mm in the horizontal direction, for example, the first peg 18 and the second peg 19 may be spaced apart by 50mm, 100mm, 200mm, 300mm, 400mm, 500mm, etc. in the horizontal direction. Since the pegs serve to transmit the force, the greater the number of pegs, the better the force transmission. If the arrangement distance of the studs is too large, the effect of the studs on force transmission is not good; if the stud setting interval is less, although the transmission effect of power is better, because of the stud quantity is too much, can cause the material waste. Therefore, in some embodiments, the arrangement distance of the studs is limited, so that the stud consumption is reduced while the force transmission effect is satisfied, and the construction cost is reduced.
Further, a first concrete 15a is poured in the expansion joint 15, and the pouring height of the first concrete 15a in the expansion joint 15 is close to or flush with the upper edge of the inter-column annular plate 17.
It will be appreciated that the function of the peg is to transmit forces. That is, when the first steel column 12 and the second steel column 13 are under pressure, the first steel column 12 and the second steel column 13 can transmit the force to the first concrete 15a poured in the expansion joint 15 through the studs; when the first concrete 15a poured in the expansion joint 15 is subjected to a tensile force, the first concrete 15a poured in the expansion joint 15 can transmit the force to the first steel column 12 and the second steel column 13 through the studs. Therefore, the tension performance of the first steel column 12 and the second steel column 13 and the compression performance of the first concrete 15a poured in the expansion joint 15 can be fully exerted, and the safety of the double-steel-column combined column base structure 10 is guaranteed.
As can be seen from the foregoing, the bending moment at the bottom end 14c of the groove 14a is the largest, and thus the bending moment at the upper edge of the inter-column annular plate 17 is the largest, so that the stress at the roots of the first steel column 12 and the second steel column 13 can be reduced by setting the casting height of the concrete in the expansion joint 15 to be close to or flush with the upper edge of the inter-column annular plate 17.
Wherein the first concrete 15a poured in the expansion joint 15 covers all the first pegs 18 and all the second pegs 19. It can be understood that the first concrete 15a and the stud poured in the expansion joint 15 need to cooperate with each other to exert the self-force and the transmission force. That is, without the first concrete 15a, the force experienced by the peg transmitting the first and second steel columns 12, 13 would not be a transmission carrier. Therefore, the first concrete 15a poured in the expansion joint 15 needs to cover all the first pegs 18 and all the second pegs 19. In other words, the first and second pegs 18 and 19 are disposed on the first and second steel columns 12 and 13, respectively, at a height approximately adjacent to or flush with the upper edge of the inter-column ring plate 17.
In some embodiments, the first steel column 12 and the second steel column 13 have second concrete 12a and third concrete 13a cast therein. Wherein the casting height of the second concrete 12a and the third concrete 13a in the first steel column 12 and the second steel column 13 is adjacent to or flush with the upper edge of the inter-column ring plate 17. As can be seen from the foregoing, the bending moment at the upper edge of the inter-column ring plate 17 is the largest, and the force applied to the first steel column 12 and the second steel column 13 at the upper edge of the inter-column ring plate 17 is the largest, so that the casting height of the second concrete 12a and the third concrete 13a in the first steel column 12 and the second steel column 13 is close to or flush with the upper edge of the inter-column ring plate 17, and the stress at the root of the double-steel-column combined column foot structure 10 can be reduced as a whole. That is, the second concrete 12a and the third concrete 13a poured into the first steel column 12 and the second steel column 13 can distribute the compressive stress applied to the first steel column 12 and the second steel column 13, so that the double-steel-column combined column foot structure 10 is more stable.
Finite element analysis will be performed on the dual-steel-column combined column base structure 10 provided by the embodiment in combination with experimental data.
Specifically, the thickness of the connecting plate 14 is 30mm, the height is 1800mm, and the depth of the groove 14a is 400 mm; the height of the inter-column ring plate 17 is 400mm, and the thickness is 30mm as an example.
The first form: referring to fig. 6, in the absence of any reinforcing structure (corresponding to the related art, the first steel column 12 and the second steel column 13 are independent from each other), the root of the joint column foot structure of the two steel columns is subjected to a tensile stress of 59.5103MPa and a compressive stress of-73.5059 MPa under the action of a set axial force and a set bending moment. As shown in fig. 6, the steel column in fig. 6 is at the root position, and is subjected to large tensile stress and compressive stress,
the second form: under the condition that the connecting plate 14 is arranged at the expansion joint 15 between the first steel column 12 and the second steel column 13, under the action of set axial force and bending moment, the tensile stress borne by the root of the double-steel-column combined column base structure is 27.5183MPa, and the compressive stress is-62.7350 MPa. The tensile stress applied to the double-steel-column combined column base structure adopting the second form is 47% of that applied to the double-steel-column combined column base structure adopting the first form, and the compressive stress applied to the double-steel-column combined column base structure adopting the second form is 85% of that applied to the double-steel-column combined column base structure adopting the first form.
That is, the connecting plate 14 is arranged between the first steel column 12 and the second steel column 13, and by limiting the height of the connecting plate 14, the thickness of the connecting plate 14 and the arrangement of the groove 14a on the connecting plate 14, the tensile stress and the compressive stress applied to the column base of the first steel column 12 and the second steel column 13 can be effectively reduced.
The third form: under the conditions that the connecting plate 14 is arranged between the first steel column 12 and the second steel column 13 and the inter-column annular plate 17 is sleeved on the peripheries of the first steel column 12 and the second steel column 13, under the action of set axial force and bending moment, the root of the joint column foot structure of the double steel columns is subjected to tensile stress of 23.1024MPa and compressive stress of-57.9243 MPa. The tensile stress experienced by the type three double-steel-column combined column base structure is 39% of the tensile stress experienced by the type one double-steel-column combined column base structure, and the compressive stress experienced by the type three double-steel-column combined column base structure is 79% of the compressive stress experienced by the type one double-steel-column combined column base structure.
That is, in addition to the above-described arrangement of the connecting plates 14, an inter-column ring plate 17 is additionally provided between the first steel column 12 and the second steel column 13, so that the tensile stress and the compressive stress applied to the column bases of the first steel column 12 and the second steel column 13 can be further effectively relieved.
Form four: referring to fig. 7, under the conditions that a connecting plate 14 is arranged between a first steel column 12 and a second steel column 13, an inter-column annular plate 17 is sleeved on the peripheries of the first steel column 12 and the second steel column 13, an inter-column expansion joint is formed between the first steel column 12 and the second steel column 13, and concrete is poured into the first steel column 12 and the second steel column 13, the tensile stress applied to the root of the joint column foot structure of the two steel columns is 22.8531MPa and the compressive stress is-56.3452 MPa under the action of set axial force and bending moment. The tensile stress experienced by the type-four double-steel-column combined column base structure is 38% of the tensile stress experienced by the type-one double-steel-column combined column base structure, and the compressive stress experienced by the type-four double-steel-column combined column base structure is 77% of the compressive stress experienced by the type-one double-steel-column combined column base structure.
That is, in addition to the arrangement of the connecting plates 14 and the inter-column ring plates 17, the arrangement of the first concrete 15a, the second concrete 12a, the third concrete 13a, the first pegs 18 and the second pegs 19 is added between the first steel column 12 and the second steel column 13, so that the effect of relieving the tensile stress and the compressive stress applied to the column bases of the first steel column 12 and the second steel column 13 is better.
Specifically, as shown in table 1 below, in table 1, the magnitudes of the tensile stress and the compressive stress applied to the root of the joint column base structure of the double-steel-column in different forms under the action of the set axial force and the set bending moment are shown.
TABLE 1
As can be seen from table 1, under the same external force applied to the first steel column 12 and the second steel column 13, compared with the dual-steel-column combined column base structure in which the first steel column 12 and the second steel column 13 are independent of each other in the related art, by using the dual-steel-column combined column base structure 10 of the embodiment, the tensile stress and the compressive stress applied to the root of the dual-steel-column combined column base structure 10 can be significantly reduced, and the safety of the dual-steel-column combined column base structure 10 is ensured.
The utility model discloses double steel post joint column base structure 10, through set up connecting plate 14 in the expansion joint that forms between first steel post 12 and the second steel post 13 that the interval set up for connecting plate 14 connects in the one end that first steel post 12 and second steel post 13 are close to bottom plate 11, realizes the common atress of double-column and the superimposed advantage of rigidity. In addition, an inter-column ring plate 17 is sleeved on the peripheries of the first steel column 12 and the second steel column 13, a stud is arranged in the expansion joint 15, and concrete is poured in the expansion joint 15, the first steel column 12 and the second steel column 13. By adopting the double-steel-column joint column base structure 10 of the embodiment, when the first steel column 12 and the second steel column 13 are subjected to bending moment or shear force in the same direction, the stress of the bottom plate 11 and the column base anchor bolt 16 can be reduced by utilizing the rigidity superposition effect of the first steel column 12 and the second steel column 13, so that the situation that the bottom plate 11 and the column base anchor bolt 16 are likely to break due to stress concentration can be avoided. When the first steel column 12 and the second steel column 13 are subjected to bending moment or shearing force in opposite directions, due to the combined action of the connecting plate 14, the inter-column ring plate 17 and the expansion joint 15, and the concrete poured in the first steel column 12 and the second steel column 13, the first steel column 12, the second steel column 13, the connecting plate 14, the inter-column ring plate 17 and the expansion joint 15, and the concrete poured in the first steel column 12 and the second steel column 13 form an integral stress structure, so that the stress in opposite directions can be mutually offset, the stress at the roots of the first steel column 12 and the second steel column 13 is further reduced, and the safety of the first steel column 12 and the second steel column 13 is ensured. In addition, the double-steel-column combined column base structure 10 disclosed by the embodiment is simple in structure and easy to construct, and the construction economy is guaranteed.
In a second aspect, referring to fig. 1 and 8, the construction method of the double-steel-column combined column base structure according to the present invention includes the following steps:
step 201: a plurality of first pegs and a plurality of second pegs are respectively disposed on mutually facing surfaces of the first steel column and the second steel column.
Specifically, it is considered that the first steel column and the second steel column in the double-steel-column combined column base structure need to be arranged on the bottom plate at intervals. Because the interval between first steel column and the second steel column is less, the space of installation peg is little, and the installation is difficult. The purpose of this step is to facilitate the installation of the stud, and if the first steel column and the second steel column are fixed first, the difficulty of the installation of the stud is increased, and even the stud cannot be installed.
The first studs are arranged at intervals along the height direction of the first steel column, the second studs are arranged at intervals along the height direction of the second steel column, and the distance between the first studs and the second studs in the vertical direction is 170mm and 230 mm; each first pin and each second pin are arranged correspondingly, and the distance between the first pin and the second pin in the horizontal direction is 50-500 mm.
Further, the first bolt and the second bolt are respectively arranged to preset positions along the height direction of the first steel column and the height direction of the second steel column.
Step 202: and fixing the first steel column and the second steel column on the bottom plate at intervals so as to form the expansion joint between the first steel column and the second steel column.
Pouring openings are reserved in the first steel column and the second steel column, and concrete can be poured into the first steel column and the second steel column from the rear side.
Step 203: and connecting the connecting plate to one ends, close to the bottom plate, of the first steel column and the second steel column so as to enable the connecting plate to be located in the expansion joint.
Specifically, the connecting plate accessible welded mode welds between first steel column and second steel column to, the extending height direction of connecting plate in the expansion joint is unanimous with the height direction of first steel column and second steel column. The connecting plate has the connection surface back to the expansion joint, and first steel column has the first surface, and the second steel column has the second surface, and the first surface flushes with the second surface, and the connection surface flushes in first surface and second surface.
It will be appreciated that prior to mounting the connection plate, one end of the mounting plate may be provided with a groove, which may be right trapezoid, isosceles trapezoid, U-shaped, V-shaped, or the like.
When this connecting plate is installed in reality, should regard as the top of connecting plate with the one end that is provided with this recess of connecting plate, and the one end that does not set up the recess of connecting plate is as the bottom of connecting plate to connect the bottom of connecting plate on the bottom plate, the both sides of the bottom of connecting plate are connected respectively in first steel column and second steel column simultaneously.
Step 204: sleeving an inter-column ring plate at the peripheries of the first steel column and the second steel column in a manner of corresponding to the top end of the connecting plate, wherein the projection of the upper edge of the inter-column ring plate on the connecting plate is positioned below the groove.
The upper edge of the inter-column ring plate is flush with the preset position, and the inter-column ring plate can be welded on the peripheries of the first steel column and the second steel column in a welding mode.
Step 205: and respectively pouring first concrete, second concrete and third concrete into the expansion joint, the first steel column and the second steel column.
And the pouring heights of the first concrete, the second concrete and the third concrete are all close to or flush with the upper edge of the inter-column ring plate.
Therefore, the construction method of the double-steel-column combined column base structure is simple, easy to operate and low in cost, and has the advantages of being easy to construct. In addition, the double-steel-column combined column base structure obtained by the construction method has all the technical effects of the double-steel-column combined column base structure in the first aspect, and the technical effects of the double-steel-column combined column base structure are fully explained in the first aspect, so that the details are not repeated.
The double-steel-column combined column base structure disclosed by the embodiment of the utility model is described in detail, a specific example is applied in the description to explain the principle and the implementation mode of the utility model, and the description of the embodiment is only used for helping to understand the double-steel-column combined column base structure and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A double-steel-column combined column base structure is characterized by comprising
A base plate;
the first steel column is arranged on the bottom plate;
the second steel column is arranged on the bottom plate, and the second steel column and the first steel column are arranged at intervals to form an expansion joint between the second steel column and the first steel column;
the connecting plate is connected to one ends, close to the bottom plate, of the first steel column and the second steel column, and the connecting plate is located in the expansion joint.
2. The double-steel-column combined column foot structure as claimed in claim 1, wherein the number of the connecting plates is two, and the two connecting plates are respectively connected to two sides of the first steel column and the second steel column;
the connecting plate is provided with a connecting surface back to the expansion joint, the first steel column is provided with a first surface, the second steel column is provided with a second surface, the first surface is flush with the second surface, and the connecting surface is flush with the first surface and the second surface.
3. The double-steel-column combined column foot structure according to claim 1, wherein the first steel column is shaped as a first rectangle having a first long side and a first short side, taken along a plane perpendicular to the height direction of the first steel column, and the second steel column is shaped as a second rectangle having a second long side and a second short side, taken along a plane perpendicular to the height direction of the second steel column;
the height h of the connecting plate is (1.3-1.7) d1+(1.0～1.6)*d2；
Wherein d is1The maximum value of the first long edge, the first short edge, the second long edge and the second short edge is obtained; d2Is the width of the expansion joint.
4. The double steel column united column base structure as claimed in claim 1, wherein the top ends of the connecting plates are provided with grooves for dispersing stress applied to the connecting plates.
5. The dual-steel-column joint column foot structure according to claim 4, wherein the width of the groove gradually decreases from the top end of the connecting plate to the bottom end of the connecting plate.
6. The dual-steel-column combined column foot structure according to claim 4, further comprising an inter-column ring plate sleeved on the peripheries of the first steel column and the second steel column.
7. The double-steel-column combined column foot structure according to claim 6, wherein the inter-column ring plate is sleeved at a position, corresponding to the top end of the connecting plate, of the peripheries of the first steel column and the second steel column, and a projection of an upper edge of the inter-column ring plate on the connecting plate is located below the groove.
8. The dual-steel-column combined column foot structure according to claim 6, wherein the height of the inter-column ring plate is (0.2-0.3) × d1The thickness of the inter-column ring plate is the same as the wall thickness of the first steel column and the second steel column;
wherein the first steel column is shaped as a first rectangle having a first long side and a first short side, the second steel column is shaped as a second rectangle having a second long side and a second short side, the second rectangle being cut along a plane perpendicular to the height direction of the second steel column; d1Is the maximum of the first long side, the first short side, the second long side, and the second short side.
9. The double-steel-column combined column foot structure according to claim 6, wherein a plurality of first pegs and a plurality of second pegs are respectively arranged on the surfaces, facing the expansion joints, of the first steel column and the second steel column, the plurality of first pegs are arranged at intervals along the height direction of the first steel column, the plurality of second pegs are arranged at intervals along the height direction of the second steel column, and each first peg is arranged corresponding to each second peg;
first concrete is poured in the expansion joint, the pouring height of the first concrete in the expansion joint is close to or flush with the upper edge of the inter-column ring plate, and the first concrete covers the first studs and the second studs.
10. The double-steel-column combined column foot structure according to any one of claims 6 to 9, wherein second concrete and third concrete are poured into the first steel column and the second steel column respectively, and the pouring heights of the second concrete and the third concrete in the first steel column and the second steel column are close to or flush with the upper edge of the inter-column ring plate.
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| CN202121521813.7U CN215948469U (en) | 2021-07-05 | 2021-07-05 | Joint column base structure of double steel columns |
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