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

（1）通过对关西大学校园记录的地震图进行回归分析，提取了反映区域地震活动的震源参数。利用这些参数，通过随机方法产生的短周期地震动模型的加权叠加，估算了关西地区假想强震的地震动。（2）用反映断层面局部不均匀性的随机过程表示的震源函数和绿色函数合成地震动。为了验证，模拟测试进行了对兵库县南部地震。（3）通过等时线分析，研究了断裂在断层面上的传播与方向性效应的关系。将地震动模型的非平稳谱表示为两种谱的乘积：一种是由滑移沿着等时线积分给出的波函数，另一种是由随机过程表示的滑移时间函数。（4）根据动力反应分析计算出的屈服地震系数和工程地震系数，对兵库县南部地震中长田区木结构房屋的破坏概率进行了估算。为了验证，估计值与现场调查给出的损坏率进行了比较。（5）从保证结构抗震安全性和提高舒适性两个角度出发，通过随机响应分析，确定了结构体系阻尼器的最佳参数。最佳阻尼器的效率通过使用记录的地震图的模拟分析进行了检查。（6）基于隔震层的轴力反应，研究了水平加竖向地震动作用下基础隔震结构的动力稳定性。

(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.