Frame beam column fire-resistant node with catenary effect and construction method thereof

Abstract

The invention relates to a frame beam column fire-resistant node which is formed by increasing a trapezoidal connecting key at the end part of a steel beam, carrying out high-strength bolt anchoring on an upper flange at the beam end and simultaneously carrying out limited anchoring on a lower flange at the beam end, wherein the lower flange at the beam end has the limited telescopic capacity under the environment of a fire disaster. The implementation of the frame beam column fire-resistant node is as follows: cutting the steel beam with the flanges and a web plate and the trapezoidal connecting key, and then respectively assembling a column, the steel beam, the trapezoidal connecting key, a stiffening plate, an end plate and a steel plate through high-strength bolts, ordinary bolts and welding seams. The frame beam column fire-resistant node is applicable to the industry with higher requirements on the fire-resistant performance and the anti-collapse capacity of the structure and a civil steel frame structure. The frame beam column fire-resistant node has the advantages of simple structure, convenient construction and low cost of required materials, and can avoid the local buckling of the beam under the high-temperature environment, form the catenary effect and have the good fire-resistant performance and the anti-collapse capacity.

Description

(1) Technical field [0001] The invention relates to a structural member, in particular to a frame beam-column fire-resistant node. (2) Background technology [0002] With the development of the economy, frequent building fires will damage or collapse the structure. The purpose of structural fire protection and fire resistance design is to prevent the structure from collapsing within a certain period of time after the fire occurs, so as to ensure the safe evacuation of people in the building. and firefighters have sufficient time to extinguish the fire. However, the current domestic and foreign codes ensure the safety of the overall structure by ensuring the stability of individual components under fire. Since the stress state and constraint conditions of individual components are very different from those in the actual structure, the fire response of individual components It cannot represent the response of the overall structure. Some fire resistance tests of the overall st...

AI Technical Summary

Problems solved by technology

However, the current domestic and foreign codes ensure the safety of the overall structure by ensuring the stability of individual components under fire. Since the stress state and constraint conditions of individual components are very different from those in the actual structure, the fire response of individual components It cannot represent the response of the overall structure. Some fire resistance tests of the overall structure and actual collapsed structures show that the inner steel beams in the overall structure will show a certain catenary effect in severe fires, which will change the mechanical mechanism of the structure and improve The fire-resistant performance of the structure is improved, and at the same time, the steel columns of the steel columns and steel beam flanges at the joints have local buckling, which is detrimental to the collapse resistance of the structure.

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