摘要
针对低周往返地震作用下的应力释放和应力调整规律,引入动态接触单元,采用El Centro地震动时程分析法,研究了接触非线性问题的高耸结构动态接触分析方法。对比分析弹性连接和动态接触方法的差异性,针对进水塔相互作用体系动力特性及响应影响规律进行讨论,将该模拟方法应用到5·12汶川地震作用下的紫坪铺1#泄洪塔工程。分析认为:考虑动态接触更符合地震作用下进水塔的实际受力情况;振动位移、速度、加速度更多地取决于地基特性,受上部结构刚度变化的影响不大;该塔体的整体稳定性可以保证,与震后复核结果相符。采用动态接触研究进水塔-岩体联合动力相互作用是十分必要的。
According to the rules of stress release and stress adjustment of structure under low- frequency cyclic earthquake action, this paper introduces dynamic contact element and adopts ground motion time histroy of E1 Centro to study contact nonlinear problem about dynamic con- tact analysis method for towering structure , comparatively analyzes the difference between etastic contact and dynamic contact methods, discusses dynamic behavior and response influence rule of intake tower interaction system. This method was used for Zipingpu 1 # intake tower under ac- tion of ＂5.12＂ Wenchuan earthquake loads. Results show that considering the dynamic contact is more consistent with the actual condition of intake tower under earthquake loads, the displace- ment ,velocity and acceleration depend more on the character of the foundation, and have little effect from the change of superstructure stiffness, the overall stability of tower can be guaranteed which accords with field check results after earthquake. Therefore, using dynamic contact method to research intake tower -rock mass combined dynamic interaction is very necessary.
出处
《防灾减灾工程学报》
CSCD
北大核心
2014年第1期58-66,共9页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金项目(51179153)
国家自然科学基金创新群体项目(40821001)资助
关键词
进水塔
时程分析
岩石力学
动态接触
地震响应
： intake tower
time-history analysis
rock mechanics
dynamic contact
seismic response
