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

本课题的主要内容如下：（1）利用关西大学的强震记录建立了一个强震数据库。该数据库被用来调查几种类型的真实的建筑，如钢结构建筑，钢筋混凝土建筑，基础隔震建筑的结构响应特性。为了合理估计基础隔震结构在长周期小振幅地震动作用下的反应，必须考虑基础隔震结构在小变形时的滞回特性。(2)针对传统的地面加速度功率谱密度函数（PSDF）模型表达低频谱分量的能力不足的问题，提出了一种新的简化模型。通过回归分析，导出了新的PSDF模型的衰减关系。基于衰减模型，建筑结构的地震输入能量 关于我们 作为震级、震源距离和表层土壤Vs 30的函数进行估计。(3)阐明了长屋二维木结构房屋的墙体数量计算刚度与总刚度之间的关系。根据地震最大速度值和破坏程度，得出房屋的刚度必须大于按一定准则按墙量计算的刚度的4 ~ 6倍，即刚度系数λ=4 ~ 6。（4）研究了正交方向上墙体数量变化对振动控制的影响。结果表明，单体型长屋结构的位移和加速度响应均大于二体型长屋结构，因此，由多栋房屋组成的长屋结构在地震作用下的拆除会导致结构的舒适度下降。当模型的壁厚为另一偏心方向的壁厚的1.5倍时，扭转振动发生的概率很小。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