Study on Dynamic Design Procedure Considering the Periodic and Non-stationary Characteristics of Seismic Waves

为了建立一种新的土木工程结构动力可靠度设计方法，研究了1)地震输入波的周期和相位特征对结构动力响应的影响，2)结构性能变化对结构动力响应的影响，3)结构体系的抗震性能估计。1)提出的地震指标，称为自然周期相关SI，在钢和RC桥墩的大范围自然周期内具有很强的相关性。钢桥墩最大响应位移的变异系数为15 ~ 18%，采用日本公路桥梁规范规定的2级I型输入地震运动的钢筋混凝土桥墩的变异系数为20 ~ 24%。2)钢桥墩最大响应位移的变异系数约为10 ~ 14%，最大响应水平力的变异系数约为4 ~ 8%。考虑得到的可靠度指标，讨论了钢桥和钢筋混凝土桥的失效概率。3)明确了橡胶厚度和碰撞速度对降低最大冲击载荷的定性影响。从所提出的面板点的滑移行为和弯曲行为出发，详细讨论了螺栓轴力和连接段分离的行为。

In order to establish a new dynamic reliability design method of civil engineering structures, we investigated 1)the influence of periodic and phase characteristics of seismic input waves on dynamic response of structures, 2)the influence of variations of structural properties on dynamic response of structures, and 3)the seismic performance estimation of structural system.1)Proposed seismic index, called as Natural-Period-Dependent SI, has strongly correlation over a wide range of natural period of steel and RC bridge piers. The coefficient of variation is from 15 to 18% for the maximum response displacements of steel bridge piers and is from 20 to 24% for their of RC bridge piers using the Level 2 Type I input earthquake motions specified by the Japanese Specifications for Highway Bridges.2)The coefficient of variation is from about 10 to 14% for the maximum response displacement and is from about 4 to 8% for the maximum response horizontal force of steel bridge piers. The failure probabilities of the steel bridge and the RC bridge are discussed considering the obtained reliability indexes.3)The qualitative influence of the rubber thickness and collision velocity on the reduction of the maximum impact load is clarified in collision between two steel bars with shock absorbing rubber for bridge restrainer system. The behavior of the bolt axial force and separation of the joint section are discussed in detail from the slippage behavior and bending behavior of the proposed panel point.