摘要
钢结构受碰撞冲击的过程是一个复杂的非线性过程。采用Abaqus/Standard模拟H型钢压弯柱的平衡状态,再以此为初始状态在Abaqus/Explicit模块中执行横向撞击的数值模拟,通过考察系统能量转化关系和沙漏能占比验证有限元模型的合理性,研究了压弯柱受横向撞击的破坏模式并进行了动态响应的参数分析。结果表明:压弯H型钢柱受横向撞击的破坏是翼缘局部失稳引起的整体失稳破坏,是否破坏主要取决于撞击动能;撞击动能、撞击质量、撞击速度、撞击位置距固端约束的距离和轴压力的增加都会加剧H型钢柱的动态响应;存在减弱压弯柱动态响应的轴压力-弯矩荷载组合,但随着叠加弯矩值的增大,柱的变形开始加剧直至失稳破坏。
The dynamic behavior and failure of steel structure subjected to impact is a complex nonlinear process.The equilibrium state of H-steel beam-column is firstly obtained by using Abaqus/Standard,and then imported to the Abaqus/Explicit as the initial state of simulation of the impact problem. By investigating the conversion of the system energy and the proportion of the hourglass energy,the rationality of finite element model is verified. The failure modes are analyzed and parameters studies are performed. The results show that： the failure mode of H-steel beam-column under transverse impact is global plastic buckling caused by local buckling of the flange of H-steel beam-column,the failure of beam-column mainly depends on the kinetic energy of the impact; the increase of impact energy（ including impact mass and impact velocity）,impact position and axial pressure will intensify dynamic response of the beam-column; when the moment is imposed on the column being axially compressed,the combined axial pressure and moment at the beam-column end exists,which can reduce the dynamic response of the beam-column,but with the increase of the moment,the deformation of the column increases until it is damaged.
作者
陈洪均
付朝江
Chen Hongjun Fu Chaojiang(College of Civil Engineering, Fujian University of Technology, Fuzhou 350180, China Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering, Fuzhou 350108, China)
出处
《建筑科学》
CSCD
北大核心
2017年第7期104-113,共10页
Building Science
基金
国家自然科学基金项目(51378124)
关键词
横向撞击
压弯H型钢柱
累积损伤失效模型
动态响应
破坏模式
transverse impact
H-steel beam-column
progressive damage and failure model
dynamic behavior
failure model
