摘要
根据弹塑性反应谱理论,按照非线性恢复力模型的等效阻尼比和位移延性的关系,以单质点弹塑性反应分析结果为依据,建立基于等效阻尼比的隔震结构弹塑性反应谱。进一步比较弹塑性反应谱和我国规范得到的反应谱,结果显示规范的加速度反应谱在长周期段谱值过大,阻尼衰减系数也较大。基于单质点弹塑性地震分析的结果,在我国规范反应谱公式的基础上提出的隔震结构弹塑性反应谱公式。最后通过对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、以及用弹塑性反应谱进行计算。结果表明,时程分析法的分析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,弹塑性反应谱的地震反应更加接近试验实测的结果,表明了新提出的弹塑性反应谱进行隔震结构的地震反应分析时具有良好的计算精度。
Based on the theory of elastic-plastic response spectrum and the relationship between displacement ductility and equivalent damping ratio of a non-linear restoring force model,according to the results of a single-mass elastoplastic response analysis,the elasto-plastic response spectrum of an isolated structure was established.Further,compared with the standard response spectrum of our country,the results showed that the values of the elasto-plastic acceleration response spectra in the long period cycles are overhigh,damping attenuation coefficients are also larger.Based on the results of a single-mass elasto-plastic seismic analysis,the elasto-plastic response spectrum formula of isolated structures was established. At last,shaking table tests of a 5-story steel isolated structure,the earthquake responses of the isolated structure using the new suggested acceleration response equation and the time history analysis method were compared,and the results obtained by using the modified long period response spectrum were consist with those from time history analyses and tests;the results by using the proposed equation of response spectrum had a higher precesion for isolated structures.
出处
《振动与冲击》
EI
CSCD
北大核心
2010年第1期30-33,42,共5页
Journal of Vibration and Shock
基金
国家自然科学基金项目(50878124
90915007)
关键词
隔震结构
弹塑性
反应谱
试验
isolated structure
elasto-plastic
response spectrum
test
