Methods for Improving Local Bending Capacity of Staggered Truss Chords

Abstract

The invention relates to a method for improving the local flexural bearing capacity of the chord of a staggered truss, comprising the following steps: 1) calculating the design value M1 of the flexural bearing capacity of the chord; 2) analyzing and calculating the structural force of the truss, and obtaining The maximum bending moment M2 of the internode chord near the column on both sides of the truss, when M2>M1, the flexural bearing capacity of the internodes on both sides is insufficient, and the steel plate needs to be welded; 3), determine the length a of the steel plate; 4), calculate The thickness t of the steel plate; 5), determine the thickness T of the steel plate that needs to be welded in the end; 6), determine the width b of the steel plate; 7) weld the internodes on both sides of the truss, with the mid-span as the center, and the length area as a The steel plate, the steel plate and the lower flange of the chord are centered, and the steel plate and the chord are welded with fillet welds in the length and width directions of the chord. In the present invention, without changing the height of the chord, a steel plate is welded to the bottom of the lower flange of the chord in the range where the bending moment of the chord is locally too large, so as to improve the bending resistance of the part.

Description

[0001] 【Technical field】 [0002] The invention relates to a manufacturing method of a building component, in particular to a method for improving the local bending bearing capacity of a chord bar of a staggered truss, and belongs to the technical field of building engineering. [0003] 【Background technique】 [0004] In the staggered truss structure system, the trusses are arranged in the height direction of the structure and the longitudinal span of the structure. The upper and lower chords of the truss can be H-shaped steel members with unequal flanges with narrow upper flanges and wider lower flanges ( figure 1 ), the floor is laid on the lower flange of the unequal flange chord, and the thickness of the floor exceeds the height of the chord, making the entire floor very flat. In the staggered truss, the truss and the column are often connected by hinge nodes, which leads to the internodes ( figure 2 ) is larger than that of other internodes. When the longitudinal column ...

AI Technical Summary

Problems solved by technology

In order to make the flexural bearing capacity of the truss chord sufficient, the conventional method is to increase the section height of the chord. However, increasing the section height of the chord may cause the upper flange of the chord to exceed the upper plane of the floor, affecting the building quality. use

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