CN103558099B - Bending torsion test loading device for steel tube concrete pile - Google Patents

Abstract

The invention discloses a loading device for a bending and torsion test of a steel pipe concrete column, which solves the two problems that the boundary condition of the bending moment in the bending and torsion test is not ideal simply supported and the steel pipe concrete column is not ideally rotated when torque is applied. It includes a tension jack, a tension sensor, a connector, a wire rope, a grooved disc, a fixed hinge support, a sliding hinge support, a reaction pier and a rotating support. The fixed hinge support and the sliding hinge support are respectively equipped with rotating supports, and the two tension jacks are respectively installed on the outside of the two reaction piers, located on the opposite side of the groove discs at both ends of the steel tube concrete column, and the top of the tension jack Equipped with a tension sensor, the tension sensor is connected with the wire rope wound on the grooved disc through the connector. After adopting the invention, the bending and torsion test results of the steel tube concrete column are in good agreement with the finite element analysis results, and the invention also has the characteristics of convenient assembly and recyclable use.

Description

A loading device for bending and torsion test of concrete filled steel tube column

technical field

The invention relates to the technical field of civil engineering building structure tests, in particular to a loading device for bending and torsion tests of steel tube concrete columns.

Background technique

In civil engineering, steel pipe concrete is used as frame corner columns of buildings, piers of curved bridges and skew bridges of expressways, columns of offshore oil production platforms, directional towers of airports and central columns of spiral stairs, etc., under wind load Under the action of earthquake and earthquake, in addition to the axial pressure and bending moment, there is also the joint action of torque. Although the simultaneous bending and torsion of CFST is rare in actual engineering, the study of the working performance of bending-torsion members will help to understand the performance of compression-bending-torsion members and compression-bending-torsion-shear members. There is a need for in-depth research.

At present, there are few experiments to study the bending and torsion of CFST columns. The main reason is that the loading device is difficult to realize. When the bending moment is applied, the friction between the CFST column and the CFST column is relatively large, which affects the rotation. There is a large gap between the test results and the finite element analysis results, which cannot guide engineering practice well.

Contents of the invention

The object of the present invention is to solve the problem that the above-mentioned test loading device is difficult to realize, and to provide a bending-torsion test loading device for concrete filled steel tube columns with simple overall structure, convenient assembly, recyclable use, and especially accurate test data.

The purpose of the present invention is achieved like this. The loading device for the bending and torsion test of the steel tube concrete column includes a tension jack, a tension sensor, a connector, a steel wire rope, a grooved disc, a fixed hinge support, a sliding hinge support, a reaction pier and a rotating support. It is characterized in that: two reaction piers are fixed on the ground, the fixed hinge support and the sliding hinge support are respectively fixed on the two reaction piers, the fixed hinge support and the sliding hinge support are respectively equipped with rotating supports, The two tension jacks are respectively installed on the outside of the two reaction piers, and are located on the opposite side of the groove disc at both ends of the steel tube concrete column. The tension sensor is installed on the top of the tension jack, and the tension sensor is wound on the groove disc through the connector. Connected by wire rope.

The invention fills up the blank of the loading device for the bending and torsion test of the steel pipe concrete column, and solves the two problems that the boundary condition of the bending moment in the bending and torsion test is not ideal simply supported and the steel pipe concrete column is not ideally rotated when the torque is applied. After adopting the invention, the steel pipe The concrete column bending and torsion test results are in good agreement with the finite element analysis results, and the invention also has the characteristics of convenient assembly and recyclable use.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention.

Figure 2 is a front view of a grooved disc of the present invention.

Fig. 3 is a left side view of Fig. 2 .

Fig. 4 is a schematic structural view of the circular column rotating support of the present invention.

Fig. 5 is a schematic structural view of the rectangular column rotating support of the present invention.

Detailed ways

Example 1:

During the actual application of the present invention, at first two reaction piers 8 are fixed on the ground according to the distance required for the test, and the fixed hinge support 6 and the sliding hinge support 7 equipped with the rotating support 9 are fixed on the reaction piers 8 Above, the fixed hinge support 6 and the sliding hinge support 7 can ensure the boundary conditions of the concrete-filled steel tube column 10 being bent, and realize an ideal simply-supported state, and the rotating support 9 can ensure the flexible rotation of the steel-filled steel tube concrete column 10 . Both ends of the concrete-filled steel tube column 10 are connected together with the grooved disc 5 by bolts and placed on two rotating supports 9. The tension jack 1 for applying bending moment and torque is installed on the outside of the reaction pier 8, located on the concrete-filled steel tube column. On the opposite side of the grooved disk 5 at both ends of the column 10, the tension sensor 2 is fixed on the top of the tension jack 1, and is connected with the steel wire rope 4 wound on the grooved disk 5 through the connector 3. When working, the bending moment and torque load are applied by the tension jack 1 through the steel wire rope 4 pulling the grooved discs 5 fixed at both ends of the steel tube concrete column 10 to ensure that the bending moment and torque change law is constant throughout the loading process. The load value is collected by the tension sensor 2, and then the bending moment and torque are calculated through the action arm to obtain the test data.

Example 2:

The present invention can replace the arc-shaped seat bracket 11 with the rectangular seat bracket 12 when carrying out the bending and torsion test of the rectangular steel tube concrete column, and the same is true for columns with other cross-sectional shapes.

Claims (1)

1. A steel tube concrete column bending and torsion test loading device, it comprises tension jack, tension sensor, connector, steel wire rope, groove disc, fixed hinge support, sliding hinge support, reaction pier and rotating support, its The feature is that two reaction piers (8) are fixed on the ground, the fixed hinge support (6) and the sliding hinge support (7) are respectively fixed on the two reaction piers (8), and the steel pipe concrete column (10) The two ends are connected with the grooved disc (5) by bolts and placed on two rotating supports (9), and the fixed hinge support (6) and the sliding hinge support (7) are respectively equipped with rotating supports (9), two tension jacks (1) are respectively installed on the outer sides of the two reaction piers (8), on the opposite side of the groove disc (5) at both ends of the steel tube concrete column (10), the tension jacks (1) The top of the top is equipped with a tension sensor (2), and the tension sensor (2) is connected to the steel wire rope (4) wound on the grooved disc (5) through the connector (3).