强震作用网架结构动力稳定分析的数值方法  

A Numerical Method for Dynamic Stability Analysis of Space Truss Structures Under Strong Earthquake Action

作　　者：魏文晖[1] 赵启元 方希兵 乐风江[2] WEI Wen-hui;ZHAO Qi-yuan;FANG Xi-bing;YUE Feng-jiang(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;School of Civil Engineering,Xinjiang University,Urumqi 830047,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,武汉430070 [2]新疆大学建筑工程学院,乌鲁木齐830047

出　　处：《武汉理工大学学报》2023年第11期71-78,共8页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(51678462);三亚崖州湾科技城海南专项博士科研基金(HSPHDSRF-2022-03-008)

摘　　要：探讨了网架结构动力稳定分析的数值方法,阐明了网架结构模态分析和动力稳定分析中的单元选用应采用多段梁单元的原因。通过采用不同形函数的不分段与分段的梁单元(多段梁单元)对简支梁和考虑下部框架的网架结构进行模态分析,并将多段梁单元应用于网架结构动力稳定性分析。结果表明:采用高阶形函数的不分段梁单元,能得到较为准确的自振频率,但无法直接反映杆件失稳;采用多段梁单元,可以模拟得到较为准确的自振频率,且可以模拟杆件失稳。强震作用下网架结构稳定分析采用分段的高阶形函数梁单元,数值分析结果更为准确可靠,可以得到合理的失效模式和破坏荷载。A numerical method for dynamic stability analysis of space truss structures was proposed.This research explained the reasons for using multi-segment beams when selecting elements for modal analysis and dynamic stability analysis of space truss structures.Unsegmented and segmented beams(multi-segment beams)with different shape functions were used to perform modal analysis on the simply-supported beam and space truss structure with its lower framework.In addition,multi-segment beams were also applied in the dynamic stability analysis of space truss structures.Comparative analysis showed that relatively accurate natural vibration frequencies could be obtained when using unsegmented beams with a high-order shape function,while this failed to reflect member buckling.When using multi-segment beams,relatively accurate natural vibration frequency could be simulated,as well as member buckling.The results indicate that numerical analysis results are more accurate and reliable and reasonable failure modes and failure loads can be obtained when using segmented beams with high-order shape functions in stability analysis of space truss structures under strong earthquake action.

关 键 词：网架结构 强震作用 多段梁单元 杆件失稳 动力稳定 

分 类 号：TU356[建筑科学—结构工程]