脉冲型近场地震波反应谱的阻尼调整系数分析

发布时间：2018-03-23 14:24

本文选题：阻尼调整系数　切入点：近场地震波　出处：《西南交通大学学报》2017年02期

【摘要】：阻尼调整系数定量描述了阻尼比对结构地震响应的影响,与地震波频谱特征等相关,用于从低阻尼比反应谱推算高阻尼比反应谱.本文以近场脉冲型地震波为对象,研究其反应谱阻尼调整系数的规律并建立计算公式.选取50条脉冲型地震波并提取出等效低频脉冲,考虑0.05~0.50之间13种阻尼比,计算得到地震波、等效脉冲的反应谱和各自基于5%阻尼比的阻尼调整系数.研究结果表明,结构周期与地震波脉冲周期比T/Tp在0.5~1.2内,提高阻尼比对位移、速度和加速度响应都有降低作用且减震效果最明显,等效脉冲与实测地震波的阻尼调整系数接近.对加速度、速度和位移谱分别拟合,得到了0.5T/Tp1.2范围内考虑脉冲周期Tp影响的阻尼调整系数评价公式.
[Abstract]:The damping adjustment coefficient quantitatively describes the influence of damping ratio on the seismic response of structures, which is related to the spectral characteristics of seismic waves and is used to calculate the response spectrum of high damping ratio from the response spectrum of low damping ratio. The law of damping adjustment coefficient of response spectrum is studied and the calculation formula is established. 50 pulse-type seismic waves are selected and the equivalent low-frequency pulses are extracted. Considering 13 damping ratios between 0.05 and 0.50, the seismic waves are calculated. The response spectrum of the equivalent pulse and the damping adjustment coefficient based on the damping ratio of 5% are obtained. The results show that the ratio of the structural period to the pulse period of the seismic wave is within 0.5 ~ 1.2, which improves the damping ratio displacement. The velocity and acceleration response are both reduced and the damping effect is the most obvious. The damping adjustment coefficient of the equivalent pulse is close to that of the measured seismic wave. The acceleration, velocity and displacement spectra are fitted respectively. The evaluation formula of damping adjustment coefficient considering the influence of pulse period TP in 0.5T/Tp1.2 range is obtained.
【作者单位】：武汉理工大学土木工程与建筑学院;上海交通大学船舶海洋与建筑工程学院;
【基金】：国家自然科学基金资助项目(51208405) 高速铁路建造国家工程实验室开放基金资助项目(HSR2013021)
【分类号】：TU311.3

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