|Table of Contents|

Study on Net Section Tension Bearing Capacity of Bolted Q690 Angle Steel After Fire(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2022年05期
Page:
132-141
Research Field:
结构工程
Publishing date:

Info

Title:
Study on Net Section Tension Bearing Capacity of Bolted Q690 Angle Steel After Fire
Author(s):
LIU Yan-zhi1;  HU Yuan-tao1;  KE Ke2
(1. College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China; 2. School of Civil Engineering, Chongqing University, Chongqing 400045, China)
Keywords:
after fire;  high strength steel;  tension bearing capacity;  effective section coefficient;  reliability analysis
PACS:
TU391
DOI:
10.19815/j.jace.2021.05053
Abstract:
The net section tension bearing capacity of bolted Q690 angle steel after fire was investigated. The finite element model of bolted Q690 angle steel was established by ABAQUS with reference to the material property test results of high strength steel Q690 after fire. The effects of out-of-plane eccentricity, bolt connection length and fire temperature on the tension bearing capacity of the net section of bolted Q690 angle steel after fire were analyzed. The calculation results of existing research related formulas and code formulas were compared with the tensile limit load of angle steel support obtained by simulation. Based on the least square method, the effective section coefficient formula of the net section tension bearing capacity of Q690 angle steel was proposed, and the numerical results were compared with the experimental results in other literatures. Based on the numerical simulation database, the reliability analysis was carried out. The results show that the effective section coefficient increases with the increase of bolt connection length and decreases with the increase of out-of-plane eccentricity. The fire temperature has little effect on the effective section coefficient. The net section bearing capacity of Q690 angle steel after different fire temperatures calculated by the formula in AISC 360-16 are unconservative, and the prediction result of the current Chinese Standard for Design of Steel Structures are in discrete distribution. The proposed calculation formula can well predict the net section tension bearing capacity of bolted Q690 angle steel under different fire temperatures. It is recommended that resistance factor of the proposed equation for calculating the net section tension bearing capacity of bolted Q690 angle steel after fire is 1.061.

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Last Update: 2022-09-30