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

卷:

39卷

期数:

2022年02期

页码:

11-18

栏目:

防灾减灾工程

出版日期:

2022-03-30

文章信息/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

文章编号:

1673-2049(2022)02-0011-08

作者:

陈 伟^1,2,刘 琨^1,2,叶继红^1,2,姜 健^1,2,高 亮¹,刘 彬³

(1. 中国矿业大学 江苏省土木工程环境灾变与结构可靠性重点实验室,江苏 徐州 221116; 2. 中国矿业大学 徐州市工程结构火安全重点实验室,江苏 徐州 221116; 3. 浙江建筑职业技术学院 建筑工程学院,浙江 杭州 311231)

Author(s):

CHEN Wei^1,2, LIU Kun^1,2, YE Ji-hong^1,2, JIANG Jian^1,2, 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)

关键词:

轻钢复合墙体;  耐火极限;  温升增量表达式;  均质防护层;  等效热物理参数

Keywords:

light steel composite wall;  fire resistance limit;  temperature rise increment expression;  homogeneous protective layer;  equivalent thermophysical parameter

分类号:

TU392.5

DOI:

10.19815/j.jace.2021.07037

文献标志码:

A

摘要:

提出以蒸压加气混凝土(ALC)板与玻特(CS)板作为覆板组合、以钢蒙皮和钢带作为墙板拼缝保护措施的新型轻钢复合墙体构造,开展了ALC板-CS板覆面的新型构造轻钢复合墙体足尺模型承重抗火试验。将轻钢复合墙体受火侧由不同覆板组合而成的防火构造简化为一层均质防护层,提出均质防护层的等效热物理参数(包括厚度、比热容、密度和导热系数)简化计算方法。根据能量守恒原理以及有限差分方法,提出ALC板-CS板覆面轻钢复合墙体的墙柱热翼缘受火温升简化增量表达式。结果表明:ALC板-CS板覆面轻钢复合墙体在0.27荷载比率条件下发生高温承载力失效的耐火极限达到197 min,表现出优异的耐火性能; 提出的温升简化增量表达式预测结果与有限元模拟结果吻合良好,可以用于确定轻钢复合墙体的耐火极限。

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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备注/Memo

备注/Memo:

收稿日期:2021-07-09
基金项目:江苏省自然科学基金项目(BK20201347); 徐州市科技计划项目(KC20175)
作者简介:陈 伟(1985-),男,山东莱阳人,副教授,工学博士,E-mail:chenweiseu@163.com。

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更新日期/Last Update: 2022-03-20