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该研究以概率地震需求分析为基础,建立了某特大桥梁结构无阻尼器和有阻尼器动力非线性模型,用增量动力分析,得到支座最大相对位移的地震响应,并定义了两个性能水准。给出了结构的易损性曲线,并对两个结构的易损性曲线进行了比较,结合地震危险性曲线,得到结构在50年内的地震需求危险性曲线。研究结果表明:不加阻尼器时50年内发生碰撞的超越概率接近极限超越概率,加阻尼器后能很好的满足性能水准要求;在小震中阻尼器对结构的抗震性能提高不是很明显,而在大震中能够对结构的抗震性能提高很多。
Based on the analysis of probabilistic seismic demand, this study establishes a non-damped and non-damped nonlinear dynamic model for a super-large bridge. Using incremental dynamic analysis, the seismic response of the maximum relative displacement of the bearing is obtained and two properties are defined level. The vulnerability curve of the structure is given and the vulnerability curves of the two structures are compared. Combined with the seismic hazard curve, the seismic demand hazard curve of the structure within 50 years is obtained. The results show that the probability of overrun of a collision occurring within 50 years without a damper is close to the limit excess probability, and the performance level can be well met after adding a damper. In a small earthquake, the damping performance of the damper is not obvious, Seismic performance of structures can be greatly improved in large earthquakes.