高温和爆炸荷载作用下轻钢柱破坏影响因素分析  

Influencing Factor Analysis on Failure Modes of Light Steel Column under High Temperature and Blast Loading

作　　者：齐宝欣[1,2] 阎石[1,2,3] 刘蕾[2] 辛志强[2] 李鹏[2] 

机构地区：[1]大连理工大学建设工程学部,辽宁大连116024 [2]沈阳建筑大学土木工程学院,辽宁沈阳110168 [3]北京理工大学爆炸科学与技术国家重点实验室,北京100081

出　　处：《沈阳建筑大学学报（自然科学版）》2012年第2期200-207,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(59778036);爆炸科学与技术国家重点实验室2010年度开放基金项目(KFJJ10-14M);2010年度安全生产重大事故防治关键技术重点科技项目(10-023);江苏省土木工程环境灾变与结构可靠性重点实验室2012年开放基金(JSKL2011YB01)

摘　　要：目的研究高温和爆炸荷载作用下轻钢柱破坏影响的主要因素,为进一步建立轻钢柱在高温和爆炸荷载作用下损伤评估方法奠定基础.方法通过有限元软件ANSYS/LS-DYNA进行非线性有限元分析,采用EUROCODE3推荐的不同温度下钢材本构关系,考虑应变率效应及Cowper-Symonds准则,建立轻钢柱的本构模型.结果高温下发生爆炸时轻钢柱破坏要比常温下严重得多,且温度越高影响越大,温度θ>400℃时,轻钢柱失效;相同支座形式下,"比例距离"越小,轻钢柱破坏越严重;支座形式不同轻钢柱破坏模式亦不同.结论典型的破坏包括,两端固接轻钢柱破坏形式为直剪破坏;柱底端固接柱顶端铰接时轻钢柱破坏模式为弯剪破坏;两端铰接时轻钢柱破坏形式为跨中受弯破坏.This paper is to analysis the influence factor on failure modes of light steel column under high temperature and explosion, the numerical analysis methods and results will further provide the basis for proposed damage assessment methodology of the light steel column under high temperature and explosion. The dynamic finite element software ANSYS/LS-DYNA is used for the numerical simulation, according to the EUROCODE3 under different temperatures with steel constitutive relation, considering the strain rate effect and the Cowper-Symonds criterion. The numerical results indicate that the destruction of the light steel column is more serious at the high temperature than that at the normal temperature and the higher temperatures, the greater blast loading. When 0 〉 400 ℃, the column failures. The destruction will be serious with decreasing of the scaled distance of the light steel column under the same support style. For different support styles, the light steel columns have different failure modes. The typical failures include three types. The first one is direct shear failure for the column fixed at both ends. The second is the combination of the shear and flexure failures for the column with a fixed end and a pin end. The third is flexural failure for the column with both pin ends.

关 键 词：火灾爆炸 爆炸荷载 轻钢柱 破坏模式 数值分析 

分 类 号：TU391[建筑科学—结构工程]