CN2743450Y

CN2743450Y - Steel pipe concrete column

Info

Publication number: CN2743450Y
Application number: CN 200420069032
Authority: CN
Inventors: 毛小勇; 何文辉; 肖岩; 单波; 郭玉荣
Original assignee: Hunan University
Current assignee: Hunan University
Priority date: 2004-10-28
Filing date: 2004-10-28
Publication date: 2005-11-30
Anticipated expiration: 2014-10-28

Abstract

The utility model discloses a steel pipe concrete column, comprising a steel pipe for filling with concrete. A steel loop or a steel plate used for laterally restraining is respectively sheathed with the connecting between the bottom and the end of the steel pipe and the beam. A gap determined by design calculation is reserved among the bottom and the end of the connecting between the steel loop or the steel plate and the column and the beam, and a gap is reserved to have a control constraint effect between the steel loop or the steel plate and the steel pipe. The utility model is a steel pipe concrete column with low engineering cost, convenient operation and lateral restraint, so it can enhance the aseismic capability and the ductility of the structure.

Description

A kind of steel core concrete column

Technical field

The utility model relates to a kind of fabric structure member, refers in particular to the steel core concrete column of the lateral restrain in a kind of structure design construction that can be applicable to the many high-rise frames in antidetonation area and bridge construction post or arch.

Background technology

The concrete filled steel tube combined member that penetration concrete can form in steel pipe, its essence belongs to hoop concrete.It is generally acknowledged in the concrete filled steel tube combined member, steel pipe not only bears longitudinal stress, simultaneously core concrete is applied horizontal restrain, makes it be in the stress state of three dimension stress, delay the generation and the development of its vertical microcrack, thereby improve its compressive strength and compression deformation ability.And outer steel pipe has prevented the cripling of thin-wall steel tube to a certain extent owing to the existence of core concrete, strengthens the geometrical stability of steel pipe walls, changes the unstability mode of empty steel pipe, thereby improves its supporting capacity.So it is a kind of quite reasonable form of structure that this steel tube-concrete composite structure is used for pressurized, it has made full use of the advantage of steel and two kinds of materials of concrete.At present, research gos deep into and uses that two kinds of form of structure, i.e. encased structures and sleeve pipe concrete structure are arranged more widely in the steel tube-concrete composite structure.

In recent years, structure is good because of intensity height, light weight, the plasticity with general hoop concrete for concrete filled steel tube (Concrete Fi1led Tube, be called for short CFT), endurance, superior mechanical property such as shock-resistant have obtained increasing application in multi-rise building and arch bridge.Concrete filled steel tube is again the effective and the most most economical form of structure of using high-strength concrete in highrise building and Longspan Bridge, this be because of: (1) steel pipe can effectively overcome the fragility of high-strength concrete to the effect of contraction of core concrete; (2) no-reinforcing-bar skeleton in the steel pipe is convenient to water high-strength concrete, and because of there being steel pipe to separate, does not disturb mutually with the outer ordinary concrete of pipe, does not have the trouble of staggered pouring; (3) steel pipe does not have concrete cover outward, can give full play to the supporting capacity of high-strength concrete.

But encased structures also has the deficiency of himself, specifically has:

(1), in traditional steel core concrete column, steel pipe had both born axial stress also will play the horizontal restrain effect to core concrete, because steel is an isotropic material, when steel pipe after surrender under the axial stress effect that axle power or moment of flexure produce, its horizontal restrain effect (particularly aspect rigidity) greatly reduces.

(2), recently the domestic and international research result shows, under the course under cyclic loading of seismic forces, plasticity easily takes place the steel pipe styletable buckles and follows inner concrete fragmentation and cause floor height to lower, thus the damage of aggravation non-structural element and make structure be difficult to repair.This failure mode will cause the hysteresis supporting capacity instability of structure equally, and particularly for the post under the high axial compression ratio effect, situation is more obvious.

The utility model content

The technical problems to be solved in the utility model just is: at the technical problem that prior art exists, provide a kind of anti-seismic performance that can strengthen structure, improve structure ductility and engineering cost is lower, the steel core concrete column of the lateral restrain of easy construction.

For solving the problems of the technologies described above, the solution that the utility model proposes is: a kind of steel core concrete column, it comprises and is used for the concrete steel pipe of filling, it is characterized in that: be arranged with steel loop or steel plate in order to play the horizontal restrain effect at the bottom of the post of the end of steel pipe and beam junction and steel core concrete column respectively.

The utility model can be further remains with the gap between at the bottom of the post of the end of described steel loop or steel plate and post and beam junction and steel core concrete column.

The utility model can further remain with the gap between described steel loop or steel plate and steel pipe.

Compare with conventional steel concrete column structure in the prior art, advantage of the present utility model is:

(1), in steel core concrete column of the present utility model, elongated steel pipe (identical) and separated the coming of function of having added the steel plate or the steel loop of cuff effect with the conventional steel concrete column.The former mainly resists the longitudinal stress that is produced by axial load and moment of flexure, and the shearing at post middle part; Steel loop or steel plate then mainly strengthen the zone that plastic hinge may occur; Steel loop or steel plate can prevent or postpone steel pipe elongated in the steel core concrete column effectively in areas of plasticity hinge generation cripling, have improved the load-carrying properties and the ductility of structure, thereby have improved anti-seismic performance;

(2), steel loop or steel plate can more efficiently constraint post in the concrete of areas of plasticity hinge, therefore, the ductility of post can be guaranteed;

(3), the working stress state of steel pipe is to bear axial compressive stress and horizontal tensile stress simultaneously in the conventional steel concrete column, but under the effect of contraction of steel loop or steel plate, the steel pipe of pressure zone will be in the three dimension stress state, this is the more efficiently duty of steel just, can delay the steel pipe partial flexing, thereby improved the ductility of member, improved the anti-seismic performance of structure;

(4), the conventional steel concrete column often adopts thicker steel pipe to prevent areas of plasticity hinge generation flexing, the thickness of steel pipe is constant along the post height, particularly rectangular section column.And in confined concrete filled tubular columns, only elongated steel pipe is considered to the longitudinal reinforcement that bears a power and moment of flexure during design, laterally strengthen by additional steel loop or steel plate at the plastic hinge position then.Second effect of elongated steel pipe is the shearing in the opposing post, and obviously, the thickness of elongated steel pipe can satisfy this requirement.Thereby although need add steel loop or steel plate at the areas of plasticity hinge confined concrete filled tubular columns, its steel using amount still will be lower than the structure of same use steel core concrete column.Because only the position that plastic hinge may occur is applied additional steel loop or steel plate, confined concrete filled tubular columns still is consistent with traditional steel pipe Xtah Crude Clay structure aspect structural system.Therefore can continue to use many existing encased structures methods for designing, reduce the difficulty of promoting.

Description of drawings

Fig. 1 is that the master of the steel core concrete column of the utility model embodiment 1 looks schematic diagram;

Fig. 2 is the schematic cross-section of the steel core concrete column of the utility model embodiment 1;

Fig. 3 is that the master of the steel core concrete column of the utility model embodiment 2 looks schematic diagram;

Fig. 4 is the schematic cross-section of the steel core concrete column of the utility model embodiment 2.

Fig. 5 is that the master of the steel core concrete column of the utility model embodiment 3 looks schematic diagram;

Fig. 6 is the schematic cross-section of the steel core concrete column of the utility model embodiment 3;

Fig. 7 is that the master of the steel core concrete column of the utility model embodiment 4 looks schematic diagram;

Fig. 8 is the schematic cross-section of the steel core concrete column of the utility model embodiment 4.

Marginal data

1, steel pipe 2, end

3, at the bottom of the post 4, steel loop

5, steel plate 6, gap

7, gap 8, beam

The specific embodiment

Below with reference to accompanying drawing the utility model is described in further details.

Embodiment 1: as depicted in figs. 1 and 2, be used for the concrete steel pipe 1 of filling and still keep consistent with the conventional steel concrete system, along the elongated layout of structure height direction, and at the bottom of the end 2 of beam 8 and steel pipe 1 junction and post, 3 be arranged with horizontal restrain respectively, this horizontal restrain can be steel loop 4 at the steel core concrete column of circular cross-section, remain with the gap of determining by designing and calculating 6 between the end 2 of steel loop 4 and beam 8 and steel pipe 1 junction and the bottom 3 of steel pipe 1, transmit longitudinal stress to avoid it; 1 of steel loop 4 and steel pipe keep certain clearance 7 according to cross section property, participate in the time of horizontal restrain to postpone steel loop 4, thereby avoid or reduce unnecessary bearing capacity and improve.

Embodiment 2: as shown in Figure 3 and Figure 4, be used for the concrete steel pipe 1 of filling and still keep the same with the conventional steel concrete system, along the elongated layout of structure height direction, and at the bottom of the end 2 of beam 8 and steel pipe 1 junction and post, 3 be arranged with horizontal restrain respectively, this horizontal restrain can be steel plate 5 at the steel core concrete column of square-section, remain with the gap of determining by designing and calculating 6 between the end 2 of steel plate 5 and beam 8 and steel pipe 1 junction and the bottom 3 of steel pipe 1, transmit longitudinal stress to avoid it; 1 of steel plate 5 and steel pipe keep certain clearance 7 according to cross section property, participate in the time of horizontal restrain to postpone steel plate 5, thereby avoid or reduce unnecessary bearing capacity and improve.

Above embodiment 1 and 2 working procedures are as follows:

1, builds substructure beam 8 and maintenance to the length of time;

2, prefabricated steel loop 4 or steel plate 5 are inserted in from steel pipe 1 upper end, steel loop 4 or steel plate 5 respectively at the bottom of post 3 ends that are connected with Liang Yuzhu 2 remain with gap 6, simultaneously 1 of steel loop 4 or steel plate 5 and steel pipe only impose spot welding at select location and are located according to designing preset clearance 7.(after steel loop or steel plate be inserted in, whether should also have individual step to be exactly down concrete, fill steel pipe and position, gap)

Embodiment 3: as shown in Figure 5 and Figure 6, be used for the concrete steel pipe 1 of filling and still keep consistent with the conventional steel concrete system, along the elongated layout of structure height direction, and at the bottom of the end 2 of beam 8 and steel pipe 1 junction and post, 3 be arranged with horizontal restrain respectively, this horizontal restrain can be steel loop 4 at the steel core concrete column of circular cross-section, steel loop 4 directly contacts with the beam 8 and end 2 of steel pipe 1 junction and the bottom 3 of steel pipe 1, can transmit longitudinal stress; Steel loop 4 directly contacts with steel pipe 1, to reach the purpose that improves bearing capacity.

Embodiment 4: as shown in Figure 7 and Figure 8, be used for the concrete steel pipe 1 of filling and still keep the same with the conventional steel concrete system, along the elongated layout of structure height direction, and at the bottom of the end 2 of beam 8 and steel pipe 1 junction and post, 3 be arranged with horizontal restrain respectively, this horizontal restrain can be steel plate 5 at the steel core concrete column of square-section, steel plate 5 directly contacts with the beam 8 and end 2 of steel pipe 1 junction and the bottom 3 of steel pipe 1, can transmit longitudinal stress; Steel plate 5 directly contacts with steel pipe 1, to reach the purpose that improves bearing capacity.

Above embodiment 3 and 4 working procedures are as follows:

1, builds substructure beam 8 and maintenance to the length of time;

2, prefabricated steel loop 4 or steel plate 5 are inserted in from steel pipe 1 upper end, impose spot welding at select location and located.(after steel loop or steel plate be inserted in, whether should also have individual step to be exactly down concrete, fill steel pipe)

Claims

1, a kind of steel core concrete column, it comprises and is used for the concrete steel pipe of filling, it is characterized in that: be arranged with steel loop or steel plate in order to play the horizontal restrain effect at the bottom of the post of the end of steel pipe and beam junction and steel core concrete column respectively.

2, steel core concrete column according to claim 1 is characterized in that: remain with the gap between at the bottom of the end of described steel loop or steel plate and post and beam junction and the post of steel core concrete column.

3, steel core concrete column according to claim 1 and 2 is characterized in that: remain with the gap between described steel loop or steel plate and the steel pipe.