基于ABAQUS的钢-混凝土组合桥抗火性能分析  

Finite element analysis on fire performance of steel-concrete composite bridges using ABAQUS

作　　者：杨丹 廖健凯 赵应 YANG Dan;LIAO Jiankai;ZHAO Ying(Department of Transportation and Municipal Engineering, Sichuan College of Architectural Technology, Deyang 618000, China)

机构地区：[1]四川建筑职业技术学院交通与市政工程系,德阳618000

出　　处：《火灾科学》2020年第3期150-161,共12页Fire Safety Science

基　　金：国家自然科学基金(41472265);四川交通科技项目(2018-C10-2)。

摘　　要：采用ABAQUS有限元软件,选取ISO 834和烃类HC火灾曲线,对钢-混凝土组合桥的抗火性能进行了分析,包括截面温度场和耐火极限分析。无防火保护的组合桥火灾下破坏准则为挠度和变形速率共同控制,HC和ISO 834两种火灾曲线下的耐火极限分别仅为5.15 min和13.95 min,钢梁下翼缘和腹板的临界温度为595℃。采取防火保护措施后,组合桥的截面温度明显降低,火灾下变形速率明显减小,破坏准则变为仅由挠度控制,因而达到耐火极限时的允许挠度更大,耐火极限明显增大。在喷涂厚度为20 mm的防火涂料进行防火保护后,HC和ISO 834两种火灾下组合梁的耐火极限分别增大为92.8 min和121.5 min,即发生火灾后将有充足的时间留给消防人员灭火。Fire performance of steel-concrete bridges was analyzed using the software ABAQUS,including a heat transfer model and a fire resistance model.The adopted fire curves were ISO 834 standard fire curve and HC fire curve.It was found that the failure of unprotected composite bridges was controlled by the criteria of mid-span deflection and deflection rate together.The calculated fire resistance under HC fire and ISO 834 fire were 5.15 min and 13.95 min and the critical temperature for bottom flange and web of steel was 595℃.After taking fire protection measures,the cross-section temperatures decreased significantly and the deflection rate also decayed.The failure of protected composite bridges turned to be controlled by deflection only,and thus a larger deflection limit was permitted.After the fire protection of 20 mm proof coating,the fire resistance of steel-concrete composite bridges under HC fire and ISO 834 fire was enhanced obviously to 92.8 min and 121.5 min,respectively,which permits enough time for fire rescue.

关 键 词：钢-混凝土组合桥 有限元 温度场 耐火极限 防火保护 

分 类 号：X932[环境科学与工程—安全科学]