地震作用下某大型隔震博物馆楼层波及楼层反应谱研究
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摘要
为了得到隔震博物馆类框架结构准确的楼层响应及楼层反应谱,以国内某实际隔震博物馆为基础,建立结构有限元模型并利用环境振动测试进行模态验证。选择7条地震波调幅进行时程分析,通过时程曲线频谱、加速度峰值两参数分析楼层波与地震波的差异。在此基础上,通过MATLAB程序计算楼层加速度反应谱,拟合用于展陈设计的标准化设计反应谱。研究结果表明:有限元模型动力特性与实测结果吻合较好;在地震作用下,1～3层展厅处的加速度峰值较其它层低,楼层波频谱的频率范围主要为低频段,楼层波卓越频率为结构自振频率。楼层波与地震波差异较大;楼层加速度反应谱是地震波与结构共同作用的结果;得到了展厅处加速度标准化设计谱曲线及数学表达,提出展陈及文物的防震设计方法。
In order to obtain the floor response and floor acceleration response spectrum of seismic isolated museum, a finite element model of actual isolated museum was established. The model was verified through environment vibration tests. 7 seismic time history curves were chosen to analyze the model. The difference between floor wave and seismic wave was analyzed through peak acceleration and frequency spectrum. The floor acceleration response spectrum was calculated through MATLAB and the design spectrum was fitted. The results show: the dynamic characteristics of FEM are in a good agreement with test values; The peak acceleration of 1—3 layers is lower than other layers. The frequency spectrum mainly ranges for low frequencies. The predominant frequency of floor wave is the natural frequency of structure. The difference between floor wave and seismic wave is great. The floor acceleration response spectrums is the result of earthquake working together with structure; The floor acceleration design response spectrum and mathematical formula were gotten. The seismic protection design method for exhibition tool and cultural relics was put forward.
In order to obtain the floor response and floor acceleration response spectrum of seismic isolated museum, a finite element model of actual isolated museum was established. The model was verified through environment vibration tests. 7 seismic time history curves were chosen to analyze the model. The difference between floor wave and seismic wave was analyzed through peak acceleration and frequency spectrum. The floor acceleration response spectrum was calculated through MATLAB and the design spectrum was fitted. The results show: the dynamic characteristics of FEM are in a good agreement with test values; The peak acceleration of 1—3 layers is lower than other layers. The frequency spectrum mainly ranges for low frequencies. The predominant frequency of floor wave is the natural frequency of structure. The difference between floor wave and seismic wave is great. The floor acceleration response spectrums is the result of earthquake working together with structure; The floor acceleration design response spectrum and mathematical formula were gotten. The seismic protection design method for exhibition tool and cultural relics was put forward.
引文
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[2]PARISI F,AUGENTI N.Earthquake damages to cultural heritage constructions and simplified assessment of artworks[J].Engineering Failure Analysis,2013,34(1):735-760.
[3]PARISI F,AUGENTI N.Earthquake damages to cultural heritage constructions and simplified assessment of artworks[J].Engineering Failure Analysis,2013,34(1):735-760.
[4]苏晓雪.馆藏可移动文物防震性能研究[D].北京:北京交通大学,2013.
[5]馆藏文物防震规范:WW/T 0069-2015[S].北京:中华人民共和国国家文物局,2015.
[6]秦权,李瑛.非结构构件和设备的抗震设计楼板[J].清华大学学报,1997,37(6):82-86.QIN Quan,LI Ying.Design floor spectra for nonstructural components and equipment in buildings[J].Journal of Tsinghua University,1997,37(6):82-86.
[7]FAN Fagung,AHAADI G.Floor response spectrum for baseisolated multi-storey structures[J].Earthquake Engineering and Structural Dynamics,1990,19:377-388.
[8]国巍,李宏男.多维地震作用下偏心结构楼板谱分析[J].工程力学,2008,25(7):125-132.GUO Wei,LI Hongnan.State-of-the-art review on development of floor response spectrum[J].World Earthquake Engineering,2008,25(7):125-132.
[9]刘佩,连鹏宇.基于环境振动测试的框架结构主裙楼动力特性分析[J].振动与冲击,2016,35(10):174-179.LIU Pei,LIAN Pengyu.Dynamic characteristics analysis of a frame structure with the main building and podium based on ambient vibration test data[J].Journal of Vibration and Shock,2016,35(10):174-179.
[10]刘沛,杨文健.中美抗震设计中地震波选取方法比较研究.[J].结构工程师,2013,29(6):7-13.LIU Pei,YANG Wenjian.Comparative study on the ground motion selection methods in Chinese and American codes[J].Structural Engineers,2013,29(6):7-13.
[11]建筑抗震设计规范:GB 50011-2010[S].北京:中国建筑工业出版社,2010.
[12]GARBACZ A,PIOTROWSKI T,COURARD L.On the evaluation of interface quality in concrete repair system by means of impact-echo signal analysis[J].Construction and Building Materials,2017,134(1):311-323.
[13]CHOPRA A K.结构动力学理论及其在地震工程上的应用:第2版[M].谢礼立,吕大刚等,译.北京:高等教育出版社,2007.
[14]郭晓云,薄景山.抗震设计反应谱的标定方法[J].世界地震工程,2011,27(1):66-70.GUO Xiaoyun,BO Jingshan.Methods of calibrating seismic design response spectrum[J].Word Earthquake Engineering,2011,27(1):66-70.
[15]曹加良,施卫星,刘文光.长周期隔震结构基于反应谱理论的地震响应预测研究[J].土木工程学报,2011,44(9):42-50.CAO Jialiang,SHI Weixing,LIU Wenguang.The seismic response prediction of long-period seismic isolated structuresbased on response spectrum theory[J].China Civil Engineering Journal,2011,44(9):42-50.