【摘要】 在对长周期结构进行抗震设计时,或采用基于位移的性能设计方法进行结构设计时,或采用各种结构控制技术对结构进行减隔震设计时,需要用到相对位移反应谱,而目前各国规范给出的一般都是某种标准化的绝对加速度反应谱。本文指出了国内外目前在用的部分规范提出的长周期反应谱存在的问题,采用80条高通低截止频率(0.025 Hz～0.125 Hz)、加速度峰值≥0.10 g的水平向强震记录,计算了周期0～10 s、阻尼比0.10～0.40的相对位移反应谱,研究了位移谱的影响因素及控制参数,建立了考虑震源参数、地震动幅值特性、场地条件、谱控制参数、阻尼比调整系数的可供长周期结构设计使用的弹性相对位移谱,给出了实用化计算公式及地震动位移峰值。结果表明,相对位移谱卓越周期是控制位移谱谱值及形状的重要参数;本文研究得到的相对位移谱能较好地拟合实际相对位移谱。更多还原

【Abstract】 Relative displacement response spectrum is not only essential in seismic design of a long-period structure but also in displacement-based seismic design and in structural control design.However,the spectrum specified by seismic codes is a normalized absolute acceleration spectrum.Problems existing in long-period range of relative displacement spectrum in codes were pointed out here.By selecting 80 high-pass filtered digital horizontal strong motion records(PGA(peak ground acceleration)≥0.10 g) with lower cut off frequency(0.025 Hz ～0.125 Hz),relative displacement spectrum was constructed with period range(0～10.0 s) and damping ratio range(0.10～0.40).Furthermore,spectral influence factors and control parameters were calculated and illustrated.Taking influence of hypocenter parameters,ground motion amplitude,site conditions,spectral control parameters and damping ratio adjustment factors on relative displacement spectrum into account,elastic relative displacement spectrum and relevant practical calculation formula for a long-period structure were proposed.Moreover,value of PGD(peak ground displacement) was given based on statistical analysis.The results revealed that predominant period is one of significant parameters controlling the value and shape of the relative displacement spectrum,and the relative displacement spectrum established here is capable of fitting real displacement spectrum.更多还原