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Study on Load-bearing Fire Resistance Test of New Light Steel Composite Wall and Simplified Calculation of Temperature Rise at Thermal Flange of Wall Column(PDF)

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

Issue:
2022年02期
Page:
11-18
Research Field:
防灾减灾工程
Publishing date:

Info

Title:
Study on Load-bearing Fire Resistance Test of New Light Steel Composite Wall and Simplified Calculation of Temperature Rise at Thermal Flange of Wall Column
Author(s):
CHEN Wei12 LIU Kun12 YE Ji-hong12 JIANG Jian12 GAO Liang1 LIU Bin3
(1. Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China; 2. Xuzhou Key Laboratory for Fire Safety of Engineering Structures, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China; 3. Department of Construction Engineering, Zhejiang College of Construction, Hangzhou 311231, Zhejiang, China)
Keywords:
light steel composite wall fire resistance limit temperature rise increment expression homogeneous protective layer equivalent thermophysical parameter
PACS:
TU392.5
DOI:
10.19815/j.jace.2021.07037
Abstract:
A new type of light steel composite wall structure was proposed, in which autoclaved aerated concrete(ALC)board and calcium-silicate(CS)board were used as sheathing board, and steel skin and steel strip were used as joint protection measures of wallboard. The full-scale model load bearing and fire resistance test of light steel composite wall with ALC board-CS board was carried out. The fireproof structure composed of different cladding boards on the fire side of light steel composite walls was simplified into a homogeneous protective layer, and a simplified calculation method of equivalent thermophysical parameters(including thickness, specific heat capacity, density and thermal conductivity)was proposed. According to the principle of energy conservation and the finite difference method, a simplified temperature rise increment expression of wall column hot flange of the ALC board-CS board sheathed light steel composite wall was proposed. The results show that the high fire resistance limit of the ALC board-CS board sheathed light steel composite wall with high temperature bearing capacity failure under the condition of 0.27 load ratio reaches 197 min, showing excellent fire resistance. The prediction results of simplified temperature rise increment expression agree well with the finite element simulation results, which can be used to determine the fire resistance limit of light steel composite wall.

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Last Update: 2022-03-20