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CN-117627277-B - Steel reinforcement framework reinforced special-shaped section concrete filled steel tube embedded column foot node

CN117627277BCN 117627277 BCN117627277 BCN 117627277BCN-117627277-B

Abstract

The invention provides a reinforcement cage reinforced special-shaped section steel tube concrete embedded column foot node, which comprises a special-shaped section steel tube concrete column, wherein the periphery of the lower part of the special-shaped section steel tube concrete column is provided with a reinforcement cage, and the reinforcement cage comprises an uplink reinforcement and a sinking reinforcement embedded in a foundation. According to the invention, the reinforcing steel bar skeleton is additionally arranged on the periphery of the special-shaped section steel tube concrete column, and the ascending steel bars and the sinking steel bars of the reinforcing steel bar skeleton are embedded into the foundation, so that the connection capability of column foot nodes and foundation concrete around the column foot nodes can be effectively enhanced, the anti-shearing capability and the anti-seismic capability of the column foot nodes are improved, and the aim of reducing the embedding depth of the embedded column foot is fulfilled.

Inventors

  • LIU YONG
  • LI ZHUOFEI
  • GUO LANHUI
  • WANG JINGFENG
  • YE FAN

Assignees

  • 合肥工业大学

Dates

Publication Date
20260505
Application Date
20231220

Claims (7)

  1. 1. The utility model provides a special-shaped cross section steel tube concrete embedded column foot node that framework of reinforcement strengthens, its characterized in that includes special-shaped cross section steel tube concrete column (1), the lower part of special-shaped cross section steel tube concrete column (1) is equipped with reinforcing steel bar skeleton (5) all around, reinforcing steel bar skeleton (5) are including ascending reinforcing steel bar (51) and the sunken reinforcing steel bar (52) of burying in basis (8), special-shaped cross section steel tube concrete column (1) include special-shaped cross section multicavity steel tube (11), the bottom welding of special-shaped cross section multicavity steel tube (11) has column foot bottom plate (6), be provided with a plurality of groups PBL connecting plate (2) between column foot bottom plate (6) and the steel tube outer wall side of special-shaped cross section multicavity steel tube (11), every group PBL connecting plate (2)'s side is equipped with the hole, installs ascending reinforcing steel bar (51) and sunken reinforcing steel bar (52) through the hole dislocation, form X shape alternately from top to bottom between ascending reinforcing steel bar (51) and the sunken reinforcing steel bar (52) to bottom, and become horizontal and be connected with longitudinal bar (7) in basis (8) after stretching out a section.
  2. 2. The steel reinforcement cage reinforced special-shaped section steel tube concrete embedded column foot node according to claim 1, wherein concrete (12) is poured in the steel tube inner cavity of the special-shaped section multi-cavity steel tube (11).
  3. 3. The reinforced skeleton reinforced special-shaped section steel tube concrete embedded column foot node according to claim 2, wherein holes are formed in positions, corresponding to the inner cavities of the steel tubes of the special-shaped section multi-cavity steel tubes (11), of the column foot bottom plate (6), a plurality of holes are formed in set positions on the outer ring of the column foot bottom plate (6), and anchor bolts (4) are installed through the matching of the positions of the holes and the anchor nuts (3).
  4. 4. The reinforced-frame reinforced special-section concrete-filled steel tube embedded column foot node according to claim 1, wherein the ascending steel bar (51) and the sinking steel bar (52) are prestressed bars.
  5. 5. The reinforced steel bar skeleton reinforced special-shaped section concrete filled steel tube embedded column foot node of claim 4, wherein the anti-punching capability is determined according to mechanical property analysis, when the column is subjected to axial pressure, the ascending steel bar (51) is subjected to tensile force to resist downward punching of the column foot, the sinking steel bar (52) is subjected to shearing and is jointly subjected to punching with the basic concrete, and the actual bearing capacity formula of the sinking steel bar (52) and the ascending steel bar (51) is as follows: Wherein: The method comprises the steps of configuring the actual shearing force value of the bent reinforcing steel bar, wherein f yv is the shearing strength design value of the bent common reinforcing steel bar, and f py is the tensile strength design value of the bent prestressed reinforcing steel bar; -design values of the shear bearing capacity of the concrete and stirrups on the inclined section of the member; -a design value of the shear load capacity of the component enhanced by the pre-applied force; And Can be calculated according to the formula in the concrete structure design Specification GB 50010-2010; 、 The cross section areas of the bent common steel bars and the bent prestressed tendons in the same plane are respectively; 、 -respectively bending up the common reinforcing steel bars and bending up the tangent line of the prestressed reinforcing steel bars and the included angle of the longitudinal axis of the member; The impact-resistant bearing capacity additionally provided by the node is formed by adopting common reinforcing steel bars The calculation is performed such that, when prestressed reinforcement is used Calculating; As for the earthquake resistance of the column foot node, according to mechanical analysis, when the column is inclined, tensile force generated in the ascending steel bar in at least one direction and the sinking steel bar opposite to the ascending steel bar acts on the PBL plate, so that the tensile force is transmitted to the steel tube concrete column, and bending moment generated by resisting earthquake is generated; Bending moment generated by tensile force: ; Horizontal resultant force generated by the pulling force: ; Wherein: 、 -the cross-sectional areas of the ascending steel bars and the sinking steel bars in the same plane respectively; 、 -the included angles between the tangent line of the ascending steel bar and the sinking steel bar and the longitudinal axis of the component are respectively; 、 The vertical distance between the combined force acting point of the ascending steel bar and the sinking steel bar and the middle point of the embedded part is respectively; f u is the design value of the tensile strength of the uplink reinforcing steel bar; f d is the design value of the tensile strength of the sinking reinforcing steel bar; according to the system of equations: The calculation formula of the concrete bearing stress of the embedded column base can be deduced: Wherein: column foot shearing force; -the distance of the post kick point to the base top surface; -depth of column foot burial; -column foot cross-sectional width; x-distance from column base bottom plate to neutral axis; further, the calculation formula of the embedding depth of the common embedded column base is as follows: the effect of the special-shaped section concrete filled steel tube embedded column foot node with the same principle of reinforcing steel bar framework enhancement is that the embedded depth formula is as follows: It follows that the lower limit of the depth of the buried layer can be effectively reduced.
  6. 6. The reinforced skeleton reinforced special-shaped section steel pipe concrete embedded column base node according to claim 1, wherein the section of the special-shaped section multi-cavity steel pipe (11) is cross-shaped, and the column base bottom plate (6) is cross-shaped.
  7. 7. The steel reinforcement cage reinforced special-shaped section concrete filled steel tube embedded column foot node according to claim 1, wherein the foundation (8) is a foundation slab or a bearing platform.

Description

Steel reinforcement framework reinforced special-shaped section concrete filled steel tube embedded column foot node Technical Field The invention relates to the technical field of engineering structures, in particular to a steel bar framework reinforced special-shaped section concrete filled steel tube embedded column foot node. Background The special-shaped section steel pipe concrete structure column can enable the steel pipe to have a synergistic effect with core concrete in the steel pipe, provides larger bearing capacity and stronger stability, and can effectively solve the problem of protruding columns due to the design of the special-shaped section, so that the wall surface is smooth and attractive, more building space is saved, and overall attractiveness and comfort level are improved. The column foot is an important node for connecting the superstructure and the foundation, and is a more important aspect in the anti-seismic design. However, according to the calculation of the formula in the existing specifications, the minimum requirement of the embedded depth of the embedded column foot is 2 to 3 times of the section width (radius), the design depth is too large for the column foot with the special-shaped section, the foundation size is too large, the excavation depth of the foundation pit is increased, the construction of the column foot is complex, the construction period is prolonged, and the final construction cost is increased. Disclosure of Invention In order to solve the problems, the invention aims to provide the reinforced skeleton reinforced special-shaped section concrete filled steel tube embedded column base node, and the joint capacity of the column base node and the surrounding basic concrete is effectively enhanced through the additionally arranged reinforced skeleton, so that the anti-shearing capacity and the anti-seismic capacity of the column base node are improved, and the aim of reducing the embedded depth of the embedded column base is fulfilled. In order to achieve the above purpose, the technical scheme of the invention is realized as follows: The reinforced steel bar framework reinforced special-shaped section steel tube concrete embedded column foot node comprises a special-shaped section steel tube concrete column, wherein the periphery of the lower part of the special-shaped section steel tube concrete column is provided with a reinforced steel bar framework, and the reinforced steel bar framework comprises an uplink steel bar and a sinking steel bar which are embedded into a foundation. Further, the special-shaped section steel tube concrete column comprises a special-shaped section multi-cavity steel tube, and concrete is poured in the inner cavity of the steel tube of the special-shaped section multi-cavity steel tube. Further, the bottom welding of dysmorphism cross-section multicavity steel pipe has the column foot bottom plate, the column foot bottom plate corresponds the position trompil with the steel pipe inner chamber of dysmorphism cross-section multicavity steel pipe, and a plurality of trompils have been seted up to the settlement position on the outer ring of column foot bottom plate, install the crab-bolt through trompil position cooperation anchor nut. Further, a plurality of groups of PBL connecting plates are arranged between the column base bottom plate and the side edges of the outer wall of the steel pipe of the special-shaped section multi-cavity steel pipe, holes are formed in the side faces of each group of PBL connecting plates, and uplink steel bars and sinking steel bars are installed in a staggered mode through the holes. Furthermore, the ascending steel bars and the sinking steel bars are staggered up and down to form X-shaped intersections, and the intersections become horizontal after a certain distance is extended and are connected with the longitudinal bars in the foundation. Furthermore, the ascending steel bars and the sinking steel bars are prestressed bars. Further, as for the punching resistance, according to the analysis of mechanical properties, when the column is subjected to axial pressure, the upward reinforcement is subjected to tensile force to resist downward punching of the column foot, the sinking reinforcement is subjected to shearing and is subjected to punching together with the basic concrete, and the actual bearing capacity formula of the sinking reinforcement and the upward reinforcement is as follows: V≤Vcs+Vp+0.8fyvAsbsinαs+0.8fpyApbsinαp Wherein: V, configuring the actual shearing force value of the bent steel bar; V cs -the design value of the shear bearing capacity of the concrete and stirrups on the inclined section of the component; V p —the design value of the shear load capacity of the component enhanced by the pre-applied force; V cs and V p can be calculated according to the formula in the concrete structure design Specification GB 50010-2010; A sb、Apb -the cross section area of the bent common steel bar