考虑损伤累积效应的钢框架结构抗震分析与设计
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摘要
为了在强震分析中考虑钢材损伤累积效应的影响,应用塑性应变和能量损耗理论建立了钢材的损伤模型,对一个9层Benchmark结构进行考虑损伤累积效应的地震分析.通过对比分析,表明考虑材料损伤累积效应因素后,结构塑性阶段的动力反应变大,损伤指标增加,损伤程度提高1个等级.针对结构在强震中考虑损伤累积效应的反应特征,通过布置斜撑对薄弱层进行了加强,使首层的动力响应和损伤程度均大大减小,上层的损伤指标虽有所增加但损伤状态变化不大.
To consider damage accumulation effects during the strong seismic analysis,a damage model for steel material was developed on the basis of plastic strain and energy dissipation theory.A seismic analysis of a 9-story benchmark model structure was conducted considering damage accumulation effects.Results of comparative analysis indicate that the dynamic responses of structure during plastic period and damage index increase,and the damage extent increases by one grade after considering the damage accumulation effects.According to the response characteristics of structure under strong earthquakes,the weak story is strengthened by adding braces.The dynamic responses and damage extent of the first story are greatly reduced,and the damage state of the upper structure changes a little.
To consider damage accumulation effects during the strong seismic analysis,a damage model for steel material was developed on the basis of plastic strain and energy dissipation theory.A seismic analysis of a 9-story benchmark model structure was conducted considering damage accumulation effects.Results of comparative analysis indicate that the dynamic responses of structure during plastic period and damage index increase,and the damage extent increases by one grade after considering the damage accumulation effects.According to the response characteristics of structure under strong earthquakes,the weak story is strengthened by adding braces.The dynamic responses and damage extent of the first story are greatly reduced,and the damage state of the upper structure changes a little.
引文
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[2]范峰,沈世钊.单层球壳模拟地震振动台试验及结构减震试验研究[J].哈尔滨建筑大学学报,2000,33(3):18-22.Fan Feng,Shen Shizhao.Study on the shaking table ex-periment and the vibration reducing experiment of singlelayer reticulated shells[J].Journal of Harbin Universityof Civil Engineering and Architecture,2000,33(3):18-22(in Chinese).
[3]李洪泉,贲庆国,于之绰,等.钢框架结构在地震作用下累积损伤分析及试验研究[J].建筑结构学报,2004,25(3):69-74.Li Hongquan,Ben Qingguo,Yu Zhichuo,et al.Analysis and experiment of cumulated damage of steelframe structures under earthquake action[J].Journal ofBuilding Structures,2004,25(3):69-74(in Chi-nese).
[4]丁阳,郭峰,李忠献.地震作用下空间网架结构考虑损伤累积效应的弹塑性分析[J].工程力学,2005,22(1):54-58.Ding Yang,Guo Feng,Li Zhongxian.Elastic-plasticanalysis of spatial trusses under earthquake excitationsconsidering damage accumulation effect[J].EngineeringMechanics,2005,22(1):54-58(in Chinese).
[5]支旭东,范峰,沈世钊.材料损伤累积在网壳强震失效研究中的应用[J].哈尔滨工业大学学报,2008,40(2):169-173.Zhi Xudong,Fan Feng,Shen Shizhao.Application ofmaterial damage cumulation in reticulated shells undersevere earthquakes[J].Journal of Harbin Institute ofTenhnology,2008,40(2):169-173(in Chinese).
[6]支旭东,吴金妹,范峰,等.考虑材料损伤累积单层柱面网壳在强震下的失效研究[J].计算力学学报,2008,25(6):770-775.Zhi Xudong,Wu Jinmei,Fan Feng,et al.Failure ofsingle layer reticulated cylindrical shells subjected toearthquakes[J].Chinese Journal of Computational Me-chanics,2008,25(6):770-775(in Chinese).
[7]杜文风,高博青,董石麟.考虑损伤累积的单层球面网壳弹塑性动力稳定研究[J].空间结构,2009,15(2):35-38.Du Wenfeng,Gao Boqing,Dong Shilin.Elastic-plasticdynamic stability analysis of single layer spherical lat-ticed shells considering damage accumulation effect[J].Spatial Structures,2009,15(2):35-38(in Chinese).
[8]徐龙河,杨冬玲,李忠献.基于应变和比能双控的钢结构损伤模型[J].振动与冲击,2011,30(7):218-222.Xu Longhe,Yang Dongling,Li Zhongxian.Strain andenergy ratio-based damage model of a steel structure[J].Journal of Vibration and Shock,2011,30(7):218-222(in Chinese).
[9]姚谦峰,苏三庆.地震工程[M].西安:陕西科学技术出版社,2001.Yao Qianfeng,Su Sanqing.Earthquake Engineer-ing[M].Xi′an:Shanxi Science and Technology Press,2001(in Chinese).
[10]LS-DYNA.Keyword User's Manual[M].Livermore,California:Livermore Software Technology Corpora-tion,2006.
[11]Ohtori Y,Christenson R E,Spencer B F Jr,et al.Benchmark control problems for seismically excitednonlinear buildings[J].Journal of Engineering Mechan-ics,ASCE,2004,130(4):366-385.
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