长周期隔震结构的地震反应分析

采用等效线性化法和时程分析法,对4个周期不同的10层隔震结构进行等效线性化和时程分析,通过对比加速度反应谱,发现我国现行抗震设计规范中设计反应谱的长周期段反应谱偏大,并提出了隔震结构长周期段反应谱修正公式.对5层钢框架隔震结构模型进行振动台试验、数值时程分析、规范反应谱计算.结果表明,时程分析法的结果和振动台试验的结果比较接近,而按照规范反应谱的等效线形化方法计算出的结果与振动台试验的结果有一些偏差,加速度反应谱修正后结构的地震反应更加接近试验实测的结果,表明了新提出的反应谱取值在进行多质点隔震结构的地震反应分析时计算精度良好.

Study on Long Period Portion of Acceleration Design Spectra

Based on the 10-mass model,the earthquake response of different natural period isolation structure are analyzed by using the equivalent linear method and time history analysis method according to the China, Japan and USA code in the paper.It is found that the response spectrum in long period part of design response spectrum of China code is too large,and the modified equation to the long period part is proposed based on the original acceleration response spectrum.In the end of the paper,aim at the shaking table test of a 5-story steel isolation structure,the earthquake response of isolation structure is compared by using the new suggestion modified acceleration response equation and time history analysis method,and the results obtained with the modified long period response spectrum is consist with the results of time history analysis and test.The response analysis results by using the suggestion equation of response spectrum value have a higher analysis precise for isolated structures.