阅读说明：本技术 一种钢管内侧加t形加劲型肋钢管混凝土柱 (Steel pipe concrete column with T-shaped stiffening rib on inner side of steel pipe ) 是由 黄宏 胡文斌 曾建涛 戴雨祺 于 2021-08-07 设计创作，主要内容包括：本发明公开了一种钢管内侧加T形加劲型肋钢管混凝土柱,钢管内侧加T形加劲型肋钢管混凝土柱包括：钢管,钢管为方钢管,钢管内部填充混凝土；T形加劲型肋,T形加劲型肋嵌设于方钢管内部并沿钢管的高度方向延伸。本发明在钢管管壁内侧沿每边设置纵向T形加劲型肋,形成带劲肋方钢管混凝土柱,延缓管壁局部屈曲,增强管壁对混凝土的约束,提高了构件承载力和变形性能,有利于发挥钢-混凝土两种材料性能。(The invention discloses a steel pipe concrete column with a T-shaped stiffening rib on the inner side of a steel pipe, which comprises the following components: the steel pipe is a square steel pipe, and concrete is filled in the steel pipe; and the T-shaped stiffening rib is embedded in the square steel pipe and extends along the height direction of the steel pipe. According to the invention, the longitudinal T-shaped stiffening ribs are arranged along each edge on the inner side of the pipe wall of the steel pipe to form the square steel pipe concrete column with the ribs, so that the local buckling of the pipe wall is delayed, the restraint of the pipe wall on concrete is enhanced, the bearing capacity and the deformation performance of the member are improved, and the performance of two materials of steel and concrete is favorably exerted.)

1. A steel pipe concrete column with a T-shaped stiffening rib on the inner side of a steel pipe is characterized by comprising the steel pipe, columnar concrete filled in the steel pipe and the T-shaped stiffening rib.

2. The outer wall of the columnar concrete is attached to the inner wall of the steel pipe, and the sections of the columnar concrete and the steel pipe are square.

3. The square steel pipe with the T-shaped stiffening rib is formed by welding 4 wall plates and 4 longitudinal T-shaped rib plates.

4. The column of claim 1, wherein the material grade of the concrete column is C50.

5. The column of claim 1, wherein said wall is made of Q345 steel.

6. The column as claimed in claim 1, wherein the longitudinal T-shaped ribs are made of the same material as the wall panels of the steel duct.

7. The column as claimed in claim 1, wherein the longitudinal T-shaped rib is thin and thick as the wall plates constituting the steel tube.

8. The column of claim 1, wherein the longitudinal T-shaped stiffener is 1/3 mm long and located in the middle of the steel tube.

9. The column as claimed in claim 1, wherein the steel plates are welded together in a form of a penetration fillet.

10. The steel tube concrete column with the T-shaped stiffening rib on the inner side of the steel tube as claimed in claim 1, wherein the ratio of the side length of the square steel tube section, the length of the web of the T-shaped stiffening rib and the length of the flange of the T-shaped stiffening rib is 10: 3: 2.

Technical Field

The invention relates to a steel pipe concrete column with a T-shaped stiffening rib on the inner side of a steel pipe, belonging to the technical field of building structures.

Background

Concrete filled steel tubes are a composite structure formed by pouring concrete into steel tubes and tamping the concrete. It is well known that concrete has high compressive strength but weak bending resistance; the steel has strong bending resistance and good elastic plasticity, but is easy to lose stability and axial compression resistance when being pressed. Through the combination of the steel pipe and the concrete, the respective defects of the two materials are made up, and the advantages of the two materials are fully exerted, so that the effect of 1+1>2 is achieved.

The steel pipes wrapped in the steel pipe concrete can directly bear external loads, and can also provide lateral restraint for the internally filled concrete, so that the deformation capacity of the concrete is improved. The inner filling concrete can also provide lateral support for the steel pipe, enhance the local stability of the steel pipe, avoid or delay the local buckling of the steel pipe and give full play to the performance of the steel pipe.

The square steel tube concrete restraint action is mainly concentrated on the corner and the core part of the concrete section. Resulting in slightly less constraint of the member. Particularly, the square steel tube concrete member with a large width-thickness ratio (B/t) has the pipe wall which is easy to generate outward local buckling under the action of pressure, so that the bearing capacity of the member is further reduced. So square steel pipe concrete structure's bearing capacity, ductility are lower, and the pipe wall easily takes place local buckling for the intensity of steel and concrete can not make full use of.

Therefore, longitudinal T-shaped stiffening ribs are required to be arranged on the inner side of the pipe wall of the steel pipe along each edge to form the ribbed square steel pipe concrete column, so that the local buckling of the pipe wall is delayed, the restraint of the pipe wall on concrete is enhanced, the bearing capacity and the deformation performance of a member are improved, and the performance of two materials of steel and concrete is favorably exerted.

Disclosure of Invention

The invention aims to prevent or delay the premature buckling of a steel pipe in a square steel pipe concrete structure and improve the constraint effect of the steel pipe on concrete, so that the constraint of the steel pipe on core concrete can be improved by additionally arranging a T-shaped stiffening rib steel plate on the inner wall of the square steel pipe, the buckling of the pipe wall of the T-shaped stiffening rib is subjected to double constraints of internal concrete and the T-shaped stiffening rib, on one hand, the pipe wall of the T-shaped stiffening rib can only be subjected to outward local buckling due to the effect of internally filled concrete, and on the other hand, the longitudinal T-shaped stiffening rib provides a supporting point for the steel pipe and limits the outward buckling of the pipe wall due to the fact that the T-shaped stiffening rib is embedded in the concrete. The buckling of the pipe wall can be effectively delayed, the contact area and mutual engaging force between the pipe wall of the steel pipe and concrete are increased, the stress performance of the steel pipe column is improved, the steel-concrete combined effect is enhanced, and the performance of the two materials can be fully exerted.

The specific embodiment of the invention is as follows: a steel pipe concrete column with T-shaped stiffening ribs on the inner side of a steel pipe comprises the steel pipe, columnar concrete filled in the steel pipe and the T-shaped stiffening ribs. The outer wall of the columnar concrete is attached to the inner wall of the steel pipe, and the cross sections of the columnar concrete and the steel pipe are square. The square steel pipe with the T-shaped stiffening rib is formed by welding 4 wall plates and 4 longitudinal T-shaped rib plates.

Preferably, the longitudinal T-shaped rib and the steel pipe of the steel pipe concrete-filled steel pipe column with the T-shaped stiffening rib on the inner side of the steel pipe are both made of Q345 steel.

Preferably, the thickness of the flange web of the T-shaped rib of the steel pipe concrete column with the T-shaped stiffening rib on the inner side of the steel pipe is the same as that of the steel pipe and is 3 mm.

Preferably, the length of the T-shaped stiffening rib in the longitudinal direction of the steel pipe concrete filled steel pipe column with the T-shaped stiffening rib on the inner side of the steel pipe is 1/3 times of the length of the steel pipe and is positioned in the middle of the steel pipe.

Preferably, the steel pipe concrete column with the T-shaped stiffening rib on the inner side of the steel pipe adopts a form of a penetration fillet weld when the steel plates are welded.

Preferably, the length of the cross section of the square steel tube of the steel tube concrete column with the T-shaped stiffening rib on the inner side of the steel tube, and the ratio of the length of the web plate of the T-shaped stiffening rib to the length of the flange of the T-shaped stiffening rib are 10: 3: 2.

the invention has the advantages that: after the square steel tube is filled with concrete, the buckling mode of the steel tube is different from that of a hollow steel tube due to the existence of the internal concrete, the steel tube is prevented from being bent inwards due to the existence of the internal concrete of the steel tube, and therefore the tube wall of the square steel tube concrete column can only be bent outwards locally under the action of axial pressure. For the steel pipe concrete column with the T-shaped stiffening rib on the inner side of the steel pipe, the buckling of the pipe wall is different from that of the common square steel pipe concrete column due to the existence of the longitudinal rib. The buckling of the pipe wall of the T-shaped stiffening rib is restrained by the internal concrete and the T-shaped stiffening rib, on one hand, the pipe wall of the T-shaped stiffening rib can only be partially buckled outwards under the action of the internal concrete, and on the other hand, the T-shaped stiffening rib is embedded and fixed in the concrete, and the longitudinal T-shaped stiffening rib provides a supporting point for the steel pipe and limits the outward buckling of the pipe wall.

The T-shaped stiffening ribs can obviously improve the bearing capacity of the square steel tube concrete, the core concrete can be more effectively restrained, the local bulging of the steel tube wall can be delayed, the material strength is fully utilized, and the bearing capacity of a test piece is improved; the axial compression stability coefficient of the medium-length column affected by the slenderness ratio is improved, so that the bearing capacity of the medium-length column is also improved.

Under normal use state, reduce steel pipe thickness and do not influence its constraint effect to core concrete, and in the conflagration, high temperature causes component material intensity to reduce, and under the condition that steel pipe thickness reduces, the steel pipe surface easily produces local bulging and buckling to reduce the steel pipe to the constraint ability of concrete, if set up reinforcing bar T shape stiffening type rib at the steel pipe inner wall, through retraining steel pipe displacement outside the plane, furthest's reduction component is because of the mechanical properties loss that the high temperature caused, extension component fire endurance. In addition, the ductility of the member can be improved by adding the T-shaped stiffening ribs, the building is prevented from collapsing suddenly under fire, precious time is saved for fire extinguishing and disaster relief, or the repair difficulty of the structure is reduced in the later period.

Drawings

FIG. 1 is a schematic cross-sectional view of a steel pipe concrete column with T-shaped stiffening ribs on the inner side of the steel pipe.

FIG. 2 is a schematic view of the vertical surface of a steel pipe concrete column with T-shaped stiffening ribs on the inner side of the steel pipe.

In fig. 1 and 2, 1 is concrete, 2 is T-shaped rib, 3 is square steel pipe.

Detailed Description

The invention provides a steel pipe concrete column with a T-shaped stiffening rib on the inner side of a steel pipe, and the invention is further explained by the description of the attached drawings and the specific embodiment.

When manufacturing a square steel pipe with T-shaped stiffening ribs, four steel plates for manufacturing the pipe wall are cut according to the preset size, then the T-shaped stiffening ribs are welded at the preset positions along the longitudinal direction, and then the steel pipe is formed by welding. Because the steel plate is thinner, the steel plate adopts a form of a penetration fillet weld when in tailor welding. All welding works in the test piece manufacturing process are welded by using carbon dioxide arc welding, and the quality of a welding seam is ensured, so that the influence of welding residual stress and residual deformation on a test result is reduced. Processing two square steel plates with the plate thickness of 10mm as cover plates of the test piece, connecting the cover plates and the square steel pipes by adopting fillet welds, polishing and flattening two ends of each hollow steel pipe, centering geometric centers of the cover plates and the hollow steel pipes, welding the cover plates at one end of each hollow steel pipe, pouring concrete at the other end of each hollow steel pipe, and then welding.

The concrete is prepared by adopting manual stirring, the square steel tube is erected during pouring, the concrete is poured into the square steel tube from the top in a layered mode, an insertion type vibrating rod is used for vibrating or knocking on the surface of the steel tube (the square steel tube is stretched into the steel tube to be completely vibrated, and the vibrating rod is used for laterally vibrating the outside of the steel tube at the bottom of a test piece to enable the test piece to be compact). The test piece maintenance method comprises the steps of natural maintenance, chiseling floating slurry on the surface of concrete after two weeks, then trowelling the surface of the concrete and the surface of the steel pipe by using high-strength epoxy mortar, polishing the concrete and the surface of the steel pipe after the concrete is hardened, and then welding an upper cover plate to ensure that the steel pipe and the core concrete can bear force together at the initial loading stage.

Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the detailed description is made with reference to the embodiments of the present invention, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the protection scope of the claims of the present invention.