西南交通大学土木工程学院,四川 成都 610031
陈巍(1991—),男,博士研究生。主要从事桥梁防灾减灾研究。E-mail:782851112@qq.com
沈锐利(1963—),男,教授,博导,博士。主要从事大跨桥梁结构分析理论与工程实践研究。E-mail:rlshen@swjtu.edu.cn
纸质出版:2021-10-15
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陈巍,沈锐利,龚旺等.H型钢混组合梁耐火极限时间研究∗[J].防灾减灾工程学报,2021,41(05):960-967.
CHEN Wei,SHEN Ruili,GONG Wang,et al.Study on Fire Resistance of H⁃shaped Steel⁃concrete Composite Beams[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(05):960-967.
陈巍,沈锐利,龚旺等.H型钢混组合梁耐火极限时间研究∗[J].防灾减灾工程学报,2021,41(05):960-967. DOI: 10.13409/j.cnki.jdpme.201905055.
CHEN Wei,SHEN Ruili,GONG Wang,et al.Study on Fire Resistance of H⁃shaped Steel⁃concrete Composite Beams[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(05):960-967. DOI: 10.13409/j.cnki.jdpme.201905055.
为探究H型钢混组合梁的耐火极限时间,采用ANSYS软件建立H型钢混组合梁的热-结构耦合计算模型,分析了火源类型、外荷载大小、腹板厚度、受火区长度对H型钢混组合梁耐火极限时间的影响。结果表明:在设定的火灾场景下,油罐车燃烧时H型钢混组合梁的耐火极限时间为36 min,而小汽车的燃烧不会造成H型钢混组合梁的下挠破坏;外荷载越大、腹板越薄、受火区越长,H型钢混组合梁的耐火极限时间越短,其耐火极限时间最多分别缩短了11、8、8 min。在此基础上提出了提升H型钢混组合梁耐火极限时间的建议。
In order to explore the ultimate fire endurance time of H-shaped steel composite beams, the thermal-structural coupling model of the H-shaped steel composite beam was established in this paper by using ANSYS software. The influence of fire source type, load size, web thickness and fire zone length on the fire-resistance performance of H-shaped steel composite beam was analyzed in this paper. The results show that under the set fire scenario, the fire endurance time of the H-shaped steel composite beam is 36 min when the tank truck burns, while the combustion of the car will not cause the down-warping damage of the H-shaped steel composite beam. The load size, web thickness and length of fire zone are key factors affecting the fire endurancee time of H-shaped steel composite beams. The greater the load, the thinner the web, and the longer the fire zone, the shorter the fire endurance time of an H-shaped steel composite beam. The fire endurance time of the H-shaped steel composite beam bridge is shortened by 11 min, 8 min and 8 min at most, respectively. On this basis, some suggestions for improving the fire endurance time of H-shaped steel-concrete composite beams are put forward in this paper.
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