爆炸与火荷载联合作用下钢梁耐火极限的数值分析  

Numerical simulation of fire resistance of steel beams subjected to blast and fire

作　　者：方秦[1] 赵建魁[1] 陈力[1] 

机构地区：[1]解放军理工大学

出　　处：《土木工程学报》2010年第S2期62-68,共7页China Civil Engineering Journal

基　　金：国家自然科学基金创新研究群体科学基金(51021001);国家重点基础研究发展计划(2009CB724608);江苏省攀登学者支撑计划(BK2008002)

摘　　要：为了弄清爆炸和火荷载对钢结构的联合作用机理及效果,以分层Timoshenko梁非线性动力有限元方法为基础,在材料本构模型中考虑材料应变速率效应和温度效应,建立爆炸和火荷载联合作用下钢梁的有限元数值分析方法,并编制相应程序FRAME-BF,利用该程序定量分析了爆炸荷载作用对钢梁耐火极限的影响规律。研究结果表明:爆炸荷载作用将降低梁的耐火能力;梁长度越长,爆炸荷载对梁耐火极限的影响程度越显著。A new numerical approach was proposed to investigate deformation and failure of steel beams subjected to combined actions of explosion and fire,based on the layered Timoshenko beam nonlinear dynamic finite element method.The rate-sensitivity and temperature effects on the material were included in the material model,and a finite element program named FRAME-BF was compiled according to the proposed approach.The response of steel beams subjected to the combined actions of explosion and fire was investigated by FRAME-BF quantificationally.It is demonstrated that fire resistance of steel beams was reduced by the action of explosion,and the more reduction was observed in longer steel beams.

关 键 词：爆炸荷载 火荷载 联合作用 钢梁 耐火极限 数值分析 

分 类 号：TU391[建筑科学—结构工程]