爆炸荷载作用下钢框架动力响应有限元分析  

Fea dynamic analysis of steel frame under explosive load

作　　者：姜宏[1] 刘鹏[1] 

机构地区：[1]桂林理工大学土木与建筑工程学院,广西桂林541004

出　　处：《湖南科技大学学报（自然科学版）》2010年第2期55-58,共4页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：广西自治区自然科学基金项目(0832018)

摘　　要：选用了具有强大显式动力分析功能的ANSYA/LS-DYNA程序,并采用Solid164显式单元进行数值模拟.分析了在爆炸荷载作用下,2层钢框架在没有考虑混凝土楼板和有混凝土楼板参与时,梁、柱截面细微的动力响应和变化规律,试图找出其破坏的薄弱环节.分析发现:爆炸冲击荷载直接作用时间极其短暂,结构动力响应复杂,且成周期性变化;梁、柱相交节点区域应力最大,柱相关单元首先会进入塑性,且单元失效也先出现在该区域的柱上;当施工阶段无楼板参与时,梁单元基本处于弹性工作状态;有楼板参与作用时,梁单元于跨中和与柱相交的节点区域首先进入塑性,梁单元在竖向荷载设计值作用下,扭曲现象明显.The two-storied steel frames were modeled with and without considering concrete slabs for capturing the dynamic responses under the blast loads by using ANSYS/LS-DYNA finite element analysis software,in which the Solid 164 element was borrowed.The following results are obtained,the materials near an explosion center are subjected to high hydrostatic-pressure,and experience high strain rate deformation,even those away from the explosion center are also in a complex stress rate.Columns are easier to fail than beams and may fail by shear yielding rather than by flexural deformation.There is also a possibility of local buckling of steel sections due to high-strain rates,which increase the effective yield strength of materials while the modulus of elasticity remains almost unchanged.

关 键 词：爆炸 钢框架 塑性 时程曲线 局部屈曲 LS-DYNA 

分 类 号：TD31[矿业工程—矿井建设]