Seismic reliability analysis of structural systems based on random ground motion model considering fault rupture process

(1)对关西大学校园地震记录进行回归分析，提取反映区域地震活动性的震源参数。利用这些参数，对随机方法生成的短周期地震动模型进行加权叠加，估计了关西地区假定强震的地震动。(2)将反映断裂面局部非均匀性的随机过程表示的震源函数与格林函数合成地震地面运动。为了验证该方法的有效性，对兵库县南部地震进行了模拟试验。(3)通过等时线分析，研究了断层面上的破裂传播与指向性效应的关系。地震动模型的非平稳谱表示为两种谱的乘积：一种是由滑动沿等时线积分给出的波函数，另一种是由随机过程表示的滑动时间函数。(4)基于屈服地震系数和动力响应分析计算的工程地震系数，估算了兵古县南部地震中长田地区木结构房屋的破坏概率。为了验证该方法的有效性，将其与现场实测的损伤比进行了比较。(5)基于随机响应分析，从保护抗震安全性和提高舒适性两个角度出发，确定了结构体系附加阻尼器的最佳参数。利用地震记录进行仿真分析，验证了优化阻尼器的效率。(6)基于隔震层的轴向力响应，研究了基础隔震结构在水平和垂直地震动作用下的动力稳定性。

(1)Seismic source parameters reflecting the regional seismic activity were extracted from the regression analysis of seismograms recorded at Kansai University campus. Using these parameters, ground motions of hypothetical strong earthquakes in Kansai area were estimated by the weighted superposition of shorter period ground motion models generated by the stochastic method.(2)Seismic ground motions were synthesized from source functions expressed as the stochastic process reflecting local inhomogeneity on the fault plane and the Green's functions. For validation, the simulation tests were carried out against the Hyogo-ken Nanbu Earthquake.(3)The relationship between the rupture propagation on the fault plane and the directivity effect was investigated through the analysis of the isochron. The non-stationary spectrum of ground motion model was expressed as the product of two kinds of spectra : one is a wave function given by the integral of the slip along the isochron and the other is a slip time function expressed by the stochastic process.(4)Damage probability of wooden houses in the Nagata-ku during the Hyogo-ken Nanbu Earthquake was estimated based on the yielding seismic coefficients and the engineering seismic coefficients calculated on the dynamic response analysis. For validation, the estimation was compared with the damage ratio given by the field survey.(5)From two viewpoints of preservation of seismic safety and improvement of comfortability, the optimum parameters of the damper attached to the structural system were determined based on the random response analysis. The efficiency of the optimum damper was examined through the simulation analysis using the recorded seismograms.(6)The dynamic stability of base-isolated structures excited by horizontal plus vertical ground motions was examined based on the axial force response of the base isolation story.