1.清华大学土木工程系,北京 100084
2.北京科技大学土木与资源工程学院,北京 100083
孙楚津(1996-),男,博士研究生。主要从事城市防灾减灾研究。Email: scj18@mails.tsinghua.edu.cn
陆新征(1978-),男,教授,博士。主要从事结构非线性仿真及防灾减灾研究。Email: luxz@tsinghua.edu.cn
收稿:2018-08-29,
修回:2018-11-07,
纸质出版:2020-10-15
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孙楚津,陆新征,程庆乐等.多层钢框架结构的区域震害模拟多自由度模型[J].防灾减灾工程学报,2020,40(05):749-756.
SUN Chujin,LU Xinzheng,CHENG Qingle,et al.A Multi⁃Degree⁃of⁃Freedom Model for Regional Seismic Damage Simulation of Multi⁃Story Steel Frame Structures[J].Journal of Disaster Prevention and Mitigation Engineering,2020,40(05):749-756.
孙楚津,陆新征,程庆乐等.多层钢框架结构的区域震害模拟多自由度模型[J].防灾减灾工程学报,2020,40(05):749-756. DOI: 10.13409/j.cnki.jdpme.2020.05.009.
SUN Chujin,LU Xinzheng,CHENG Qingle,et al.A Multi⁃Degree⁃of⁃Freedom Model for Regional Seismic Damage Simulation of Multi⁃Story Steel Frame Structures[J].Journal of Disaster Prevention and Mitigation Engineering,2020,40(05):749-756. DOI: 10.13409/j.cnki.jdpme.2020.05.009.
传统的易损性分析方法难以满足城市区域震害预测的需求。基于非线性多自由度层模型和动力时程分析的城市抗震弹塑性分析方法近年来得到快速发展。为了进一步丰富区域震害模拟的可模拟结构类型,基于城市抗震弹塑性分析方法的流程框架,建立了多层钢框架结构的多自由度剪切模型。通过统计规范中的公式参数和文献中的钢框架推覆结果,对模型的周期、阻尼比、骨架线参数和滞回曲线参数进行了标定,并根据文献和美国HAZUS报告给出了多层钢框架结构的损伤判别准则。最后,分别使用文献中的试验结果和文献中设计实例的推覆分析结果对模型进行了验证。结果表明:(1)建立了多层钢框架结构的多自由度剪切模型并进行了参数标定,为区域震害模拟提供了可用模型;(2) 对多层钢框架结构的损伤判别准则进行了标定,可以根据区域震害模拟结果评价其破坏状态;(3)在考虑骨架线参数不确定性的情况下,模型精度满足区域震害模拟的要求。
Urban seismic damage is difficult to predict using traditional vulnerability analysis method. The cityscape nonlinear time-history analysis of urban buildings based on nonlinear multi-degree-of-freedom (MDOF) models and the time-history analysis have been developed rapidly in recent years. In order to include more structural types in the simulation using the regional seismic damage simulation method, the MDOF shear model of multi-story steel frame structures is established based on the simulation framework of the cityscape nonlinear time-history analysis. In this work, formulas and parameters in the design code are investigated, and the pushover results of steel frames in literatures are collected. Subsequently, the period, damping ratio, backbone curve parameters and hysteretic curve parameters are determined. Furthermore, the damage criteria of multi-story steel frame structures aredetermined according to literatures and the HAZUS report. Finally, the model is validated through experiment results in literatures and the pushover analysis results of the designs in literatures, respectively. The main conclusions are as follows: (1) The MDOF shear model of multi-story steel frame structures is established and the parameters are determined, which provides a useful model for regional seismic damage simulation of steel frame structures. (2) The damage criteria of multi-story steel frame structures are determined, and the damage state can be evaluated according to the simulation results subsequently. (3)The validation result shows that the model can satisfy the accuracy demand of regional seismic damage simulation considering the uncertainty of backbone curve parameters.
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