三维地震动作用下双层球面网壳的破坏机理研究（英文）  

Research on Failure Mechanism of Double-Layer Spherical Reticulated Shells under Three-Dimensional Earthquake Excitation

作　　者：冯雪[1] 李会军[1] 李明富[1] 李广德[1] 

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100

出　　处：《建筑钢结构进展》2016年第1期8-22,共15页Progress in Steel Building Structures

基　　金：National Natural Science Foundation(51408490);Fundamental Research Funds for the Central Universities(QN2012027,2452015372);Doctoral Scientific Research Fund of Northwest A&F University(2012BSJJ002);Training Programs of Innovation and Entrepreneurship for Undergraduates in 2014(1201410712113)

摘　　要：系统地研究了双层凯威特型球面网壳在三维地震动激励下的失效机理及破坏过程。将4种矢跨比的网壳作为分析对象,以其变形能力、屈服杆件数、应变能和应变等作为考察网壳结构动力特性的指标,选取了Taft,Kobe和El Centro这3条地震记录,深入研究了网壳结构在地震动作用下的破坏过程,给出了各矢跨比网壳杆件失效的先后次序,研究了4种网壳结构失效机理的异同之处。计算表明:尽管临界峰值加速度不同,但4个球面网壳的动力响应在一些方面表现出了共性,如网壳均经历了较深的塑性发展与损伤累积,最后均发生了强度破坏;网壳的失效机理与破坏过程却截然不同;进行抗震计算时,应根据网壳的动力特性与地震波的频谱特性合理地选择所需输入的地震波。研究结论可为双层球面网壳的设计提供借鉴与参考。In this paper,the failure mechanism of double-layer spherical reticulated shells is systematically studied.Reticulated shells with four different height-to-span ratios are selected as numerical models.Several parameters,including maximum deformation,number of yielding members,strain energy and strains,are compared to evaluate the dynamic characteristics of these four reticulated shells.Three seismic waves,Taft,Kobe and El Centro,are selected as earthquake excitations.The yielding sequence and different failure mechanism of four reticulated shells under earthquake excitation are also obtained.The results of numerical study indicate the dynamic response of reticulated shells is similar,although the values of critical peak acceleration of earthquakes are different.Four reticulated shells undergo sufficient development of plasticity and damage,and strength failure occurs during the earthquake excitation.Failure mechanism and damage process of four reticulated shells are clearly different.Earthquake motion should be rationally selected based on the dynamic characteristics of reticulated shells and frequency spectrum.The study presented herein can provide a reference for structural design of double-layer spherical reticulated shells.

关 键 词：双层球面网壳 三维地震动 失效机理 动力特性 峰值加速度 

分 类 号：TU318[建筑科学—结构工程]