A Design Method of Reinforced Floor Chords for Pipe Truss Structures

Abstract

The invention belongs to the technical field of steel structure construction, and in particular relates to a method for designing a reinforced landing chord of a pipe truss structure. The method includes the following steps: 1) Carrying out load-bearing tests on the entire space pipe truss structure under various load conditions Force analysis; 2), analyze the extracted internal force; 3), adopt the method of setting cross stiffeners to strengthen the landing chord; 4), segment the pipe truss, and use the cutting machine to make V-shaped reinforcement section of the landing chord Grooving treatment of the groove; 5) After accurate positioning, fix the end of the cross stiffener to the bottom plate of the column foot through V-groove welding; 6) Insert the notch of the reinforced section of the landing chord into the cross stiffener, and The connection is fixed by penetration welding. Effectively avoid a vicious circle in which the section bending rigidity increases sharply caused by increasing the wall thickness of the chord or increasing the diameter of the pipe, which in turn causes a greater stress on the chord of the reinforced section.

Description

technical field [0001] The invention belongs to the technical field of steel structure buildings, and in particular relates to a design method for a reinforced landing chord of a pipe truss structure. Background technique [0002] The tube truss structure is a unique structural system composed of the superior mechanical performance and beautiful external shape of steel pipes. This system can well meet the latest design concepts of steel structures and is also an important symbol to measure the level of a country's architectural science and technology. one. [0003] In the design of the tube truss structure, it is often encountered that the internal force of the member and the size of the section are difficult to coordinate. When the column foot of the pipe truss adopts the rigid connection design, there will often be a large axial force and bending moment in the chord at the landing section, and the axial force plays a controlling role. Considering the stress characteristi...

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Problems solved by technology

[0004] However, the above two strengthening forms will greatly increase the bending stiffness of the reinforced section while increasing the axial stiffness of the bar section, and the increase in the local bar stiffness in the structure will cause changes in the structural stiffness matrix, resulting in The internal force of the member is redistributed. Due to the large increase in the bending stiffness of the reinforced chord, the bending moment distributed in the chord will increase significantly. Therefore, the actual strengthening effect is not significant

In addition, the increase of the outer diameter of the reinforced section chord will affect the local appearance, and it is difficult to meet the requirements of architectural modeling

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