摘要
对重大工程结构进行强地震作用下的连续倒塌全过程分析并建立相应的设计与控制方法,已成为当前地震工程领域的发展趋势。目前,由于数值求解方面的困难,绝大多数针对极端作用下的结构连续倒塌的研究止步于数值临界状态的界定,在分析过程中不能实时地对结构构件的损伤状态进行监测并根据构件的损伤状态对分析模型进行修改。为了实现连续倒塌过程中构件的逐步失效,在OpenSees程序中,基于Beam with Hinges Element构建了端部带附属节点的Beam with Hinges Element,并根据构件失效情况对附属节点的多点约束进行控制。采用三次静力凝聚方法和Newmark-beta法,给出了对此改进建模技术可信的理论背景,方法的准确性通过一个简单框架算例得到了验证。
It has been a tendency in the field of earthquake engineering to perform progressive collapse analysis of infrastructures under strong earthquake and to establish corresponding design and control methods. Currently,due to numerical challenges,most investigations associated with progressive collapse analysis of structures applied with abnormal load are terminated at numerically defined critical state of the structures. Therefore,real-time damage status of structural components cannot be monitored throughout analysis and numerical model cannot be modified according to damage status. For the purpose of reflecting gradual failure of structural components during progressive collapse,the element Beam with Hinges Element in OpenSees program was constructed with master-slave nodes at each end of components. Multiple constraints can be controlled with transient failure status of structural components. Application of the Triple Static Condensation method together with the Newmark-beta method presents credibly theoretical background for the proposed modeling technique,whose accuracy was verified by a simple reinforced concrete frame.
出处
《防灾减灾工程学报》
CSCD
北大核心
2014年第5期632-636,共5页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金项目(90915005
51161120359)
教育部新世纪优秀人才项目(NCET-08-0096)资助
关键词
OPENSEES
连续倒塌
建模技术
静力凝聚
动态内力重分布
OpenSees
progressive collapse
modeling technique
static condensation
dynamic redistribution of internal forces
