CN110714576A - Corrugated steel pipe restricts steel core concrete column that UHPC component is strengthened - Google Patents

Abstract

The present invention provides a concrete-filled steel tube column reinforced by corrugated steel pipes constrained by UHPC (ultra-strong high-performance fiber reinforced concrete) components, comprising outer-layer steel pipes, distributed concrete, corrugated steel pipes and reinforced concrete, and more than one corrugated steel pipes are distributed and arranged in the outer layer of steel pipes. Inside the section, the reinforced concrete is filled in the section of each corrugated steel pipe, and the interlayer gap between the corrugated steel pipe and the outer steel pipe is filled with distributed concrete. The invention adopts the corrugated steel pipe to constrain the UHPC as the core component, and performs key reinforcement of the steel pipe concrete, and improves the bearing capacity and comprehensive performance of the steel pipe concrete on the basis of maintaining the original characteristics of the steel pipe concrete. The invention makes full use of the restraining effect of the corrugated steel pipe placed in the UHPC, can improve the bearing capacity of the steel pipe concrete, integrates the advantages of various materials, and is simple in operation, convenient in construction and cost saving.

Description

A concrete-filled steel tubular column reinforced by corrugated steel pipes restrained by UHPC components

technical field

The invention belongs to the field of civil engineering, and relates to a reinforced concrete-filled steel tubular column member, in particular to a reinforced concrete-filled steel tubular column of a corrugated steel tube restrained UHPC member.

Background technique

Due to its high bearing capacity, good plasticity and toughness, and convenient construction, CFST columns are widely used in industrial plants, subways, high-rise buildings and arch bridges at home and abroad, and have achieved good economic benefits and construction. Effect. However, when the CFST bears a large load, a larger section is still required, and the steel pipe is simultaneously subjected to longitudinal pressure and hoop tension, and the longitudinal pressure will greatly reduce the restraint effect of the steel pipe on the concrete.

The existing reinforcement methods for CFST columns mainly include built-in reinforcement method, hollow sandwich method, double steel pipe method and so on. For example, Chinese patent CN205077729U discloses a concrete-filled steel tubular member in which I-shaped stiffeners are arranged around the inner side of an outer steel pipe, and the I-shaped stiffeners and the outer steel pipe are connected by high-strength bolts. Although this method increases the flexural rigidity of the component through the I-beam, the I-shaped stiffener has no restraint effect on the concrete and cannot improve the integrity of the structure; for example, Chinese patent CN2765965Y discloses a hollow concrete-filled steel tube column, including The steel pipe column set as the outer layer is provided with a concrete column with a cavity in the middle and tightly integrated with the inner wall of the steel pipe column. The existence of the internal steel pipe improves the bending stiffness of the component, saves materials and reduces the cost, but the internal steel pipe cannot produce axial deformation, and cannot cooperate with the concrete to deform during the stress process, thus making the structural integrity during the stress process. For another example, Chinese patent CN109235778A discloses a concrete-filled steel tubular column, which includes an outer steel pipe body, an inner steel pipe body is arranged at the axis of the outer steel pipe body, and a plurality of connecting plates are arranged between the inner steel pipe body and the outer steel pipe body. , the space between the inner steel pipe body and the outer steel pipe body is filled with concrete. This method effectively improves the bearing capacity of the CFST column, but the function of the inner steel pipe body is limited, and the amount of steel and the weight of the structure are increased for no reason, which is not conducive to cost saving.

Therefore, the existing reinforcement methods for concrete filled steel tubular columns have poor structural integrity or poor structural integrity, or the deformation is asynchronous during the stress process, or involves many components, or the effect of internal steel is low, or the material consumption is large and the cost increases. economical inadequacies.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a corrugated steel pipe constrained UHPC (Ultra Strong High Performance Fiber Concrete) member reinforced concrete-filled steel column column. The corrugated steel pipe can make the UHPC in it in a three-dimensional complex stress state during the compression process to improve its strength and ductility; the setting of corrugated folds and the existence of UHPC and external distributed concrete can avoid local buckling of the corrugated steel pipe. In addition, the characteristic of the corrugated steel pipe itself being able to produce axial deformation can cooperate with the concrete to produce axial deformation during the compression process, avoiding the relative deformation between the two, and the two can form a good combination. And the interior of each corrugated steel pipe can be set longitudinally along the longitudinal direction according to the needs, and the reinforcement concrete fills and wraps the longitudinal reinforcement, and the longitudinal reinforcement further enhances the flexural bearing capacity. longitudinal buckling. Placing this combination in an ordinary CFST column can greatly improve the bearing capacity and bending resistance of the CFST column, save materials, reduce costs, and simplify the construction process.

Technical scheme of the present invention: The present invention provides a concrete-filled steel tube column reinforced by corrugated steel pipes for restraining UHPC components, including outer-layer steel pipes, distributed concrete, corrugated steel pipes and reinforced concrete, and more than one corrugated steel pipes are distributed and arranged inside the section of the outer-layer steel pipes , the corrugated steel pipe and the outer steel pipe are hollow, and the reinforced concrete is filled inside the section of each corrugated steel pipe. The compressive strength of the corrugated steel pipe is greater than 120MPa, the corrugated steel pipe is continuously or intermittently arranged with multiple corrugated folds along its longitudinal axis, the surface of the outer steel pipe is smooth and smooth without corrugated folds, and the outer steel pipe, distributed concrete, corrugated steel pipe and reinforced concrete are poured through concrete Bonded to form a unitary member.

The interior of each corrugated steel pipe is provided with longitudinal steel bars along the longitudinal direction, and the reinforced concrete fills and wraps the longitudinal steel bars.

The total area of each corrugated steel pipe is not more than 30% of the area occupied by the outer steel pipe.

The outer layer steel pipe is circular, rectangular, oval, equilateral polygon or special-shaped, and the corrugated steel pipe is circular, rectangular, oval, and equilateral polygon. The shape of the outer layer steel pipe and the corrugated steel pipe can be the same or different.

The corrugated steel pipes are discretely distributed at intervals inside the section of the outer steel pipe, and there are gaps between the multiple corrugated steel pipes, and the distributed concrete fills the gaps.

A plurality of corrugated steel pipes are closely arranged to form a corrugated steel pipe bundle, and more than one corrugated steel pipe bundle is arranged inside the section of the outer steel pipe.

The corrugated steel pipes are uniformly distributed or non-uniformly distributed in the section of the outer steel pipe. When they are uniformly distributed, the corrugated steel pipes have the same spacing in the outer steel pipe section. .

Reinforced concrete is cement-based fiber concrete, which is high-performance concrete and is mainly composed of materials such as silica fume, cement, water reducing agent, fine aggregate and steel fiber.

The outer steel pipe has the same height as the corrugated steel pipe.

Ordinary steel tube concrete has low strength. If all UHPC is used as the filling concrete in the steel tube, the cost will be high. Even so, the restraint effect of the steel tube is low. On the basis of the original characteristics, the bearing capacity and comprehensive performance of CFST are improved without increasing the cost too much. The invention can improve the bearing capacity of the steel tube concrete, integrate the advantages of various materials, and at the same time, the operation is simple, the construction is convenient, and the construction cost is saved. Compared with other reinforced concrete-filled steel tubular members, it has the following advantages:

1. The corrugated steel pipe can put the UHPC in it in a three-way complex stress state during the compression process to improve its strength and ductility; the setting of corrugated folds and the existence of UHPC and external distributed concrete can avoid local buckling of the corrugated steel pipe.

2. The interior of the corrugated steel pipe can be provided with longitudinal steel bars along the longitudinal direction according to the needs, and the reinforcement concrete fills and wraps the longitudinal steel bars, and the longitudinal steel bars further enhance the flexural bearing capacity. longitudinal buckling.

3. The characteristic of corrugated steel pipe itself being able to produce axial deformation can be combined with concrete to produce axial deformation during the compression process, avoiding the relative deformation between the two, and the two can form a good combination to achieve a corrugated steel pipe restraint UHPC Concrete-filled steel tubular structure as the core member.

4. Move the outer steel pipe of ordinary CFST to the inside to form a more efficient built-in corrugated steel pipe, which can reduce the steel consumption of the structure while achieving the same performance.

5. The corrugated steel pipe restrains UHPC as the core component, which enhances the bearing capacity of the CFST and improves the comprehensive performance of the CFST. The distributed concrete, the corrugated steel pipe and the reinforced concrete are bonded by concrete pouring to form an integral component. Rebar in reinforced concrete.

6. Control the total area of each corrugated steel pipe to be no more than 30% of the area occupied by the outer layer of steel pipe, which will not increase the cost while improving the comprehensive performance of CFST.

The corrugated steel pipe restrained UHPC component-reinforced concrete-filled steel column proposed by the invention has good restraint effect, strong integrity and comprehensive performance, and has strong application value.

Description of drawings:

Fig. 1 is a kind of corrugated steel pipe restraint UHPC member reinforced concrete-filled steel tubular column, and the circular corrugated steel pipe is evenly distributed in the section of the circular outer layer of steel pipe in the form of a single root when the three-dimensional details show schematic diagram;

Fig. 2 is a kind of corrugated steel pipe restraint UHPC member reinforced concrete-filled steel tubular column, and the cross-sectional schematic diagram of the circular corrugated steel pipe is uniformly distributed in the section of the circular outer layer steel pipe along the circumference in a single form;

Fig. 3 is a concrete-filled steel tubular column reinforced by corrugated steel pipes restrained by UHPC components, and the three-dimensional details of the circular corrugated steel pipes are evenly distributed in the cross-section of the circular outer steel pipes in the form of a bundle of corrugated steel pipes;

Fig. 4 is a kind of corrugated steel pipe constrained UHPC member reinforced concrete-filled steel tubular column, and the cross-sectional schematic diagram of the circular corrugated steel pipe is evenly distributed in the cross-section of the circular outer steel pipe in the form of a bundle of corrugated steel pipes;

Fig. 5 is a concrete-filled steel tubular column reinforced by corrugated steel pipes constrained by UHPC components, and a schematic diagram showing three-dimensional details when circular corrugated steel pipes are non-uniformly distributed in the cross-section of circular outer steel pipes in a single form;

Fig. 6 is a kind of corrugated steel pipe constraining UHPC member-reinforced concrete-filled steel tubular column, and the cross-sectional schematic diagram of the circular corrugated steel pipe is unevenly distributed in the cross-section of the circular outer layer steel pipe in the form of a single piece;

Fig. 7 is a concrete-filled steel tubular column reinforced by corrugated steel pipes restraining UHPC components, and the three-dimensional detail display schematic diagram when circular corrugated steel pipes are non-uniformly distributed in the cross-section of circular outer steel pipes in the form of corrugated steel pipes;

8 is a cross-sectional schematic diagram of a corrugated steel pipe constrained UHPC member-reinforced concrete-filled steel tubular column, and the circular corrugated steel pipe is unevenly distributed in the cross-section of the circular outer steel pipe in the form of a bundle of corrugated steel pipes;

Figure 9 is a cross-sectional schematic diagram of a corrugated steel pipe constrained UHPC member-reinforced concrete-filled steel tubular column, and the circular corrugated steel pipe is uniformly distributed in the cross-section of the rectangular outer steel pipe in a single form;

Figure 10 is a cross-sectional schematic diagram of a corrugated steel pipe constraining a UHPC member-reinforced concrete-filled steel pipe column, and the rectangular corrugated steel pipe is uniformly distributed in the cross-section of the rectangular outer layer steel pipe in a single form;

Figure 11 is a cross-sectional schematic diagram of a corrugated steel pipe constrained UHPC member-reinforced concrete-filled steel tubular column, and the rectangular corrugated steel pipe is evenly distributed in the cross-section of the circular outer steel pipe in a single form;

In the drawings, 1 is the outer layer steel pipe; 2 is the distribution concrete; 3 is the corrugated steel pipe; 4 is the reinforced concrete; 31 is the corrugated fold; 300 is the corrugated steel pipe bundle.

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

Example 1:

As shown in Figures 1-2, a CFST column reinforced by corrugated steel pipes constrained by UHPC components includes outer steel pipes 1, distributed concrete 2, corrugated steel pipes 3 and reinforced concrete 4, and more than one corrugated steel pipes 3 are distributed and arranged in Inside the section of the outer layer steel pipe 1, one corrugated steel pipe 3 is concentrically distributed with the outer layer steel pipe 1, and the remaining 6 corrugated steel pipes 3 are evenly distributed inside the section of the outer layer steel pipe 1 in the form of a single root, and the reinforced concrete 4 is filled with each corrugated pipe. Inside the section of the steel pipe 3, the gap between the corrugated steel pipe 3 and the outer steel pipe 1 is filled with the full distribution concrete 2, the compressive strength of the distributed concrete 2 is not greater than 80MPa, and the compressive strength of the reinforced concrete 4 is greater than 120MPa. A plurality of corrugated folds 31 are arranged continuously or at intervals in the longitudinal axis direction. The surface of the outer layer steel pipe 1 is smooth and smooth without corrugated folds. .

Example 2:

As shown in Figures 3-4, a CFST column reinforced by corrugated steel pipes constrained by UHPC components includes outer steel pipes 1, distributed concrete 2, corrugated steel pipes 3 and reinforced concrete 4, 12 corrugated steel pipes 3 and 4 corrugated steel pipes. The form of the bundles 300 is evenly distributed inside the section of the outer steel pipe 1. Each corrugated steel pipe bundle 300 is formed by three corrugated steel pipes 3 closely arranged. The compressive strength of the distributed concrete 2 is not greater than 80MPa, the compressive strength of the reinforced concrete 4 is greater than 120MPa, and the corrugated steel pipe 3 is continuously or spaced along its longitudinal axis with a plurality of corrugated folds 31. The surface of the outer steel pipe 1 is smooth and smooth. Without corrugated folds, the outer steel pipe 1, the distribution concrete 2, the corrugated steel pipe 3 and the reinforced concrete 4 are bonded by concrete pouring to form an integral component.

Example 3:

As shown in Figures 5-6, a CFST column reinforced by corrugated steel pipes constrained by UHPC components includes outer steel pipes 1, distributed concrete 2, corrugated steel pipes 3 and reinforced concrete 4. Five corrugated steel pipes 3 are in the form of a single root It is non-uniformly distributed inside the section of the outer layer steel pipe 1, the reinforced concrete 4 is filled in the section of each corrugated steel pipe 3, and the gap between the corrugated steel pipe 3 and the outer layer steel pipe 1 is poured and filled with the distributed concrete 2, and the distribution concrete 2 is exposed. The compressive strength is not greater than 80MPa, and the compressive strength of the reinforced concrete 4 is greater than 120MPa. The corrugated steel pipe 3 is provided with a plurality of corrugated folds 31 continuously or at intervals along its longitudinal axis. 1. The distributed concrete 2, the corrugated steel pipe 3 and the reinforced concrete 4 are bonded by concrete pouring to form an integral component.

Example 4:

As shown in Figures 7-8, a CFST column reinforced by corrugated steel pipes constrained by UHPC components includes outer steel pipes 1, distributed concrete 2, corrugated steel pipes 3 and reinforced concrete 4, 9 corrugated steel pipes 3 to 3 corrugated steel pipes The form of the bundle 300 is non-uniformly distributed and arranged inside the section of the outer steel pipe 1, more than one corrugated steel pipe 3 is distributed and arranged inside the section of the outer steel pipe 1, the reinforced concrete 4 is filled inside the section of each corrugated steel pipe 3, and the corrugated steel pipes are clustered There is a gap between 300 and the outer steel pipe 1, the distribution concrete 2 fills the gap, the compressive strength of the distributed concrete 2 is not greater than 80MPa, the compressive strength of the reinforced concrete 4 is greater than 120MPa, and the corrugated steel pipe 3 is continuous along its longitudinal axis. Or a plurality of corrugated folds 31 are arranged at intervals, the surface of the outer layer steel pipe 1 is smooth and smooth without corrugated folds, and the outer layer steel pipe 1, the distribution concrete 2, the corrugated steel pipe 3 and the reinforced concrete 4 are bonded by concrete pouring to form an integral component.

Example 5:

As shown in FIG. 9 , a CFST column reinforced by corrugated steel pipes constrained by UHPC components includes outer steel pipes 1 , distributed concrete 2 , corrugated steel pipes 3 and reinforced concrete 4 , and more than one corrugated steel pipes 3 are distributed and arranged on outer steel pipes 1 . Inside the section of each corrugated steel pipe 3, the reinforced concrete 4 is filled in the section of each corrugated steel pipe 3, the gap between the corrugated steel pipe 3 and the outer steel pipe 1 is filled with the distributed concrete 2, the compressive strength of the distributed concrete 2 is not more than 80MPa, and the reinforced concrete 4 The compressive strength is greater than 120MPa, the corrugated steel pipe 3 is provided with a plurality of corrugated folds 31 continuously or at intervals along its longitudinal axis direction, the surface of the outer layer steel pipe 1 is smooth and smooth without corrugated folds, the outer layer steel pipe 1, distributed concrete 2, corrugated steel pipe 3 and The reinforced concrete 4 is bonded by concrete pouring to form an integral member. The outer layer steel pipe 1 is rectangular, and the corrugated steel pipe 3 is circular.

Example 6:

As shown in FIG. 10 , a CFST column reinforced by corrugated steel pipes constrained by UHPC components includes outer steel pipes 1 , distributed concrete 2 , corrugated steel pipes 3 and reinforced concrete 4 , and more than one corrugated steel pipes 3 are distributed and arranged on outer steel pipes 1 . Inside the section of each corrugated steel pipe 3, the reinforced concrete 4 is filled in the section of each corrugated steel pipe 3, the gap between the corrugated steel pipe 3 and the outer steel pipe 1 is filled with the distributed concrete 2, the compressive strength of the distributed concrete 2 is not more than 80MPa, and the reinforced concrete 4 The compressive strength is greater than 120MPa, the corrugated steel pipe 3 is provided with a plurality of corrugated folds 31 continuously or at intervals along its longitudinal axis direction, the surface of the outer layer steel pipe 1 is smooth and smooth without corrugated folds, the outer layer steel pipe 1, distributed concrete 2, corrugated steel pipe 3 and The reinforced concrete 4 is bonded by concrete pouring to form an integral member. The outer layer steel pipe 1 is rectangular, and the corrugated steel pipe 3 is rectangular.

Example 7:

As shown in FIG. 11 , a CFST column reinforced by corrugated steel pipes constrained by UHPC components includes outer steel pipes 1 , distributed concrete 2 , corrugated steel pipes 3 and reinforced concrete 4 , and more than one corrugated steel pipes 3 are distributed and arranged on outer steel pipes 1 . Inside the section of each corrugated steel pipe 3, the reinforced concrete upper 4 is filled in the section of each corrugated steel pipe 3, the gap between the corrugated steel pipe 3 and the outer steel pipe 1 is filled with distributed concrete 2, and the compressive strength of the distributed concrete 2 is not more than 80MPa, and the reinforced concrete The compressive strength of 4 is greater than 120MPa, the corrugated steel pipe 3 is provided with a plurality of corrugated folds 31 continuously or at intervals along its longitudinal axis direction, the surface of the outer layer steel pipe 1 is smooth and smooth without corrugated folds, the outer layer steel pipe 1, distributed concrete 2, corrugated steel pipe 3 and reinforced concrete 4 are bonded by concrete pouring to form an integral member. The outer layer steel pipe 1 is circular, and the corrugated steel pipe 3 is rectangular.

In the above embodiment, as required, longitudinal steel bars are arranged inside each corrugated steel pipe 3 along the longitudinal direction, and the reinforced concrete 4 fills and wraps the longitudinal steel bars.

The total area of each corrugated steel pipe 3 is not more than 30% of the area occupied by the outer layer steel pipe 1 .

The reinforced concrete 4 is cement-based fiber concrete.

The outer layer steel pipe 1 and the corrugated steel pipe 3 have the same height.

Claims (9)

1. A concrete-filled steel tube column reinforced by corrugated steel pipes constrains UHPC components, characterized in that it comprises outer layer steel pipes (1), distribution concrete (2), corrugated steel pipes (3) and reinforced concrete (4), and more than 1 corrugated steel pipes ( 3) Distributed and arranged inside the section of the outer layer steel pipe (1), the reinforced concrete (4) is filled inside the section of each corrugated steel pipe (3), and the gap between the corrugated steel pipe (3) and the outer layer steel pipe (1) is filled The compressive strength of the distributed concrete (2), the compressive strength of the distributed concrete (2) is not more than 80MPa, the compressive strength of the reinforced concrete (4) is greater than 120MPa, and the corrugated steel pipe (3) is provided with a plurality of corrugated folds continuously or at intervals along its longitudinal axis direction (31), the surface of the outer layer steel pipe (1) is smooth and smooth without corrugated folds, and the outer layer steel pipe (1), the distribution concrete (2), the corrugated steel pipe (3) and the reinforced concrete (4) are bonded by concrete pouring to form an integral component . 2 . The reinforced concrete-filled steel tubular column as claimed in claim 1 , characterized in that longitudinal steel bars are arranged in the interior of each corrugated steel pipe ( 3 ) along the longitudinal direction, and the reinforced concrete ( 4 ) fills and wraps the longitudinal steel bars. 3 . 3. A corrugated steel pipe constrained UHPC member-reinforced concrete-filled steel tubular column according to claim 1, characterized in that the total area of each corrugated steel pipe (3) is not greater than 30% of the area occupied by the outer steel pipe (1). 4. a kind of corrugated steel pipe as claimed in claim 1 restrains UHPC member reinforcement concrete-filled steel pipe column, it is characterized in that outer layer steel pipe (1) is circle, rectangle, ellipse, equilateral polygon or special shape, corrugated steel pipe (3) ) are circles, rectangles, ellipses, and equilateral polygons. 5. The reinforced concrete-filled steel tubular column of a corrugated steel pipe restraint UHPC member as claimed in claim 1, characterized in that the corrugated steel pipe (3) is discretely distributed at intervals inside the section of the outer steel pipe (1), and a plurality of corrugated steel pipes (3) There are gaps between them, and the distribution concrete (2) fills the gaps. 6. The reinforced concrete-filled steel tubular column of a corrugated steel pipe restraint UHPC member as claimed in claim 1, characterized in that a plurality of corrugated steel pipes (3) are closely arranged to form a corrugated steel pipe bundle (300), and more than one corrugated steel pipe bundle (300) ) is arranged inside the section of the outer layer steel pipe (1), a gap is provided between the corrugated steel pipe bundle (300) and the outer layer steel pipe (1), and the distribution concrete (2) fills the gap. 7 . The reinforced concrete-filled steel tubular column as claimed in claim 1 , characterized in that the corrugated steel pipes ( 3 ) are uniformly distributed or non-uniformly distributed in the section of the outer steel pipe ( 1 ). 8 . 8. The reinforced concrete-filled steel tubular column as claimed in claim 1, characterized in that the reinforced concrete (4) is cement-based fiber concrete. 9. A corrugated steel pipe constrained UHPC member-reinforced concrete-filled steel tubular column according to claim 1, characterized in that the outer layer steel pipe (1) and the corrugated steel pipe (3) have the same height.

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