黏滞阻尼器消能减震结构在多遇地震下附加阻尼比计算方法对比研究
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摘要
确定消能减震结构在多遇地震作用下阻尼器的等效附加阻尼比是消能减震结构设计的关键。较易于应用在工程实践的三种等效附加阻尼比计算方法分别为:规范反应谱法、规范时程法和时程能量比法。本文参考层模型概念给出了规范时程方法中阻尼器耗能和结构应变能的一种计算方法;讨论了能量等效的理论依据和基本假定;评述了三种方法的优缺点。为避免时程分析中地震动的离散性,本文时程分析采用了人工合成地震动。基于自主研发软件,使用上述三种方法计算了某实际消能减震结构的等效附加阻尼比,讨论了三种方法的差异。
The key step of the energy dissipation structure design is to calculate the equivalent additional damping ratio of the damper under frequent earthguake. There are three equivalent additional damping ratio calculation methods: code response spectrum method, code time-history method and time-history energy ratio method, which are easily usded in engineering practice. Base on the concept of structural layer model, a method of calculating the energy dissipation of the damper and structural strain energy in the code time-history method is given in this paper. The theoretical basis and basic assumption of the time history energy equivalent method are discussed. The advantages and disadvantages of the three methods are reviewed. In order to avoid the discreteness of the ground motions, the artifical ground motions are used in time history method. The equivalent additional damping ratios of an energy dissipation structure are calculated by the three methods mentioned above, and the differences are analyzed.
The key step of the energy dissipation structure design is to calculate the equivalent additional damping ratio of the damper under frequent earthguake. There are three equivalent additional damping ratio calculation methods: code response spectrum method, code time-history method and time-history energy ratio method, which are easily usded in engineering practice. Base on the concept of structural layer model, a method of calculating the energy dissipation of the damper and structural strain energy in the code time-history method is given in this paper. The theoretical basis and basic assumption of the time history energy equivalent method are discussed. The advantages and disadvantages of the three methods are reviewed. In order to avoid the discreteness of the ground motions, the artifical ground motions are used in time history method. The equivalent additional damping ratios of an energy dissipation structure are calculated by the three methods mentioned above, and the differences are analyzed.
引文
[1] GB 50011—2010, 建筑抗震设计规范 [S]GB 50011—2010, Code for seismic design of buildings [S] (in Chinese)
[2] JGJ 297—2013, 建筑消能减震技术规程[S]JGJ 297—2013, Technical specification for seismic energy dissipation [S] (in Chinese)
[3] FEMA 273. NEHRP guidelines for the seismic rehabilitation of buildings [S]. Washington DC: Federal Emergency Management Agency, 1997
[4] 巫振弘, 薛彦涛, 王翠坤, 等. 多遇地震作用下消能减震结构附加阻尼比计算方法 [J]. 建筑结构学报, 2013, 34(12): 19-25Wu Zhenhong,Xue Yantao,Wang Cuikun,et al. Research on additional damping ratio calculation methods under frequent earthquake [J]. Journal of Building Structures, 2013, 34(12): 19-25(in Chinese)
[5] 丁永君, 刘胜林, 李进军. 粘滞阻尼结构小震附加阻尼比计算方法的对比分析 [J]. 工程抗震与加固改造, 2017, 39(1): 78-83Ding Yongjun,Liu Shenglin,Li Jinjun. Analysis of additional damping ratio calculation methods of nonlinear viscous damping structure under frequent earthquake [J]. Earthquake Resistant Engineering and Retrofitting, 2017, 39(1): 78-83(in Chinese)
[6] 翁大根, 李超, 胡岫岩, 等. 减震结构基于模态阻尼耗能的附加有效阻尼比计算 [J]. 土木工程学报, 2016, 49(S1): 19-31Weng Dagen, Li Chao, Hu Xiuyan, et al. Calculation of additional effective damping ratio of structures base on modal damping energy dissipation [J]. China Civil Engineering Journal, 2016, 49(S1): 19-31(in Chinese)
[7] 曹胜涛, 李志山, 刘春明, 等. 大规模建筑结构非线性显式动力分析的振型阻尼实现 [J]. 建筑结构, 2016, 46(1): 30-37Cao Shengtao, Li Zhishan, Liu Chunming, et al. On the applying modal damping in nonlinear explicit dynamic analysis of large-scale structure [J]. Building Structure, 2016, 46(1): 30-37 (in Chinese)
[2] JGJ 297—2013, 建筑消能减震技术规程[S]JGJ 297—2013, Technical specification for seismic energy dissipation [S] (in Chinese)
[3] FEMA 273. NEHRP guidelines for the seismic rehabilitation of buildings [S]. Washington DC: Federal Emergency Management Agency, 1997
[4] 巫振弘, 薛彦涛, 王翠坤, 等. 多遇地震作用下消能减震结构附加阻尼比计算方法 [J]. 建筑结构学报, 2013, 34(12): 19-25Wu Zhenhong,Xue Yantao,Wang Cuikun,et al. Research on additional damping ratio calculation methods under frequent earthquake [J]. Journal of Building Structures, 2013, 34(12): 19-25(in Chinese)
[5] 丁永君, 刘胜林, 李进军. 粘滞阻尼结构小震附加阻尼比计算方法的对比分析 [J]. 工程抗震与加固改造, 2017, 39(1): 78-83Ding Yongjun,Liu Shenglin,Li Jinjun. Analysis of additional damping ratio calculation methods of nonlinear viscous damping structure under frequent earthquake [J]. Earthquake Resistant Engineering and Retrofitting, 2017, 39(1): 78-83(in Chinese)
[6] 翁大根, 李超, 胡岫岩, 等. 减震结构基于模态阻尼耗能的附加有效阻尼比计算 [J]. 土木工程学报, 2016, 49(S1): 19-31Weng Dagen, Li Chao, Hu Xiuyan, et al. Calculation of additional effective damping ratio of structures base on modal damping energy dissipation [J]. China Civil Engineering Journal, 2016, 49(S1): 19-31(in Chinese)
[7] 曹胜涛, 李志山, 刘春明, 等. 大规模建筑结构非线性显式动力分析的振型阻尼实现 [J]. 建筑结构, 2016, 46(1): 30-37Cao Shengtao, Li Zhishan, Liu Chunming, et al. On the applying modal damping in nonlinear explicit dynamic analysis of large-scale structure [J]. Building Structure, 2016, 46(1): 30-37 (in Chinese)