A method for strengthening the steel frame structure against progressive collapse

Abstract

The invention provides a strengthening method for resisting progressive collapse through a steel frame structure. Through the design method for resisting progressive collapse in the standard, the position of a key pillar is determined. After the key pillar is chosen and determined, the key pillar is assumed as a destroyed steel pillar, and single oblique ribs or double oblique ribs are additionally arranged on joist steel of the two sides of the destroyed steel pillar. The pressure arching effect of the key pillar position is reinforced, and the redundancy degree and the progressive collapse resistance property of a newly-built building are improved. Or after a weak pillar or a destroyed pillar is known through exploration and observation, the weak pillar or the destroyed pillar is assumed as the destroyed steel pillar. According to the arrangement conditions of building components and site conditions of construction, the single oblique ribs or the double oblique ribs are chosen for strengthening, and strengthening for progressive collapse resistance is achieved. The strengthening method for resisting progressive collapse through the steel frame structure is simple in design and mounting and good in economic benefits. Oblique ribs and regular stress components are not superimposed, so that the strengthening method for resisting progressive collapse through the steel frame structure is applied to a newly-built structure, strengthening reconstruction of an existing structure, a full welding beam pillar joint point, and an end plate connecting beam pillar joint point.

Description

technical field [0001] The invention belongs to the technical field of building structures, and in particular relates to a steel frame structure anti-continuous collapse reinforcement method. Background technique [0002] The steel structure has the advantages of light weight, fast construction and superior seismic performance. Compared with concrete structure and masonry structure, it has better deformation capacity and hysteresis performance, and has more superior performance under earthquake and impact. However, compared with the concrete frame structure, the fire resistance of the steel frame structure is poor, and the safety reserve under the action of special loads is low. The loss of the carrying capacity of key nodes leads to progressive collapse. In the anti-progressive collapse design of structures, when the vertical load-bearing components are damaged, whether it is the "alternative path method" that focuses on the overall performance or the "tie strength method...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a steel frame structure anti-progressive collapse reinforcement method to solve the steel frame structure can not form "arch effect", improve the existing traditional anti-progressive collapse reinforcement measures to control the structural deformation of the initial damage structure of the structural column The problem

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