Study on Estimations of Earthquake Ground motion models and Damage Preventions of Building Structures in Kansai Area

本课题的工作总结如下：(1)利用关西大学强震地震记录建立了数据库。该数据库用于研究几种类型的实际建筑的结构响应特征，如钢结构建筑、钢筋混凝土建筑和基础隔离建筑。为了合理估计基础隔震结构在长周期、长持续、小振幅地震动作用下的响应，必须考虑基础隔震系统的小变形滞回特性。(2)提出了一种新的地面加速度功率谱密度函数（PSDF）简化模型，提高了传统模型对其低频谱分量的表达能力。通过回归分析，导出了新PSDF模型的衰减关系。基于衰减模型，估计了建筑结构的地震输入能量…More与震级、震源距离和地表土层的Vs30有关。(3)阐明了长屋二维木结构住宅墙体量计算的刚度与总刚度的关系。根据地震运动的最大速度值和破坏等级，得出房屋的刚度必须比按一定标准计算的墙量刚度大4 ~ 6倍；即刚度系数λ=4-6。(4)考察了正交方向壁量变化对振动控制的影响。研究发现，长屋单次模型的位移和加速度响应比二次模型大，因此，由于多栋房屋组成的长屋在地震中被拆除，其舒适性较差。当模型的壁量为另一个偏心方向壁量的1.5倍时，几乎不会产生扭转振动。少

The summaries of this title of project are as follows :(1) A database has been build from the strong ground motion seismograms recorded at Kansai University. The database is used to investigate the structural response characteristics of several types of real buildings such as a steel building, a reinforced concrete building, and a base-isolated building. For reasonable response estimation of base-isolated buildings under excitation of long-period ground motion with long duration but small amplitude, it is shown to be necessary to consider the hysteretic characteristics in small deformations of the base isolation system.(2) A new simple model for power spectral density function (PSDF) of ground acceleration is proposed to improve the conventional models in the ability of expressing their low-frequency spectral components. The attenuation relation for the new PSDF model is derived through regression analysis. Based on the attenuation model, earthquake input energy for building structures … More is estimated as a function with respect to magnitude, hypocentral distance, and Vs30 of surface soil layers.(3) It is clarified that the relationship between the stiffness calculated from the wall quantity and the total stiffness of 2D wooden framed houses, Nagaya. Based on the maximum velocity values of earthquake motions and damage levels, it is concluded that the stiffness of the houses must be 4 to 6 times greater than the stiffness calculated by the wall quantity based on certain criteria ; i.e. the stiffness factor λ=4-6.(4)The effect of wall quantity variation of the orthogonal direction on the vibration control is examined. It is found that the displacement and the acceleration responses of the Nagaya single model are larger than that of the quadric one, therefore pulling down of Nagaya consisted of several houses leads to the bad amenity during earthquake. When the wall quantity of the models has one and half times as much as the other eccentric direction one, torsional vibration would be rarely caused. Less