不规则公路桥梁地震动参数快速评估技术研究

快速评估不规则公路桥梁的地震动参数为桥梁地震响应分析、桥梁安全性设计提供科学依据。研究一种快速、有效的不规则公路桥梁地震动参数评估技术,以C形不规则公路桥梁为原型设计振动台与公路桥梁模型,选取Imperial Valley波作为地震动输入,采用加速度传感器、位移传感器采集桥梁加速度与位移数据;结合已知地震动数据计算地震动持续时长参数,优化衰减模型获取精确的地表峰值加速度参数。分析地表峰值加速度与其他地震动参数关系可知,地表峰值加速度与损坏概率成正比,桥梁结构发生损坏的概率在50%以下;震级越大、震中距越小、地表峰值加速度越大。

Research on Rapid Evaluation Technology of Seismic Motion Parameters of Irregular Highway Bridges

Rapid evaluation of seismic parameters of irregular highway bridges provides scientific basis for bridge seismic response analysis and bridge safety design.A fast and effective technique for evaluating seismic parameters of irregular highway bridges is studied.Shaking table and highway bridge model are designed with Cshaped irregular highway bridges as prototype.Imperial Valley wave is selected as seismic input.Acceleration and displacement sensors are used to collect acceleration and displacement data of bridges,and the duration parameters of seismic ground motion are calculated with known seismic data.Optimize the attenuation model to obtain the precise peak acceleration parameters.The relationship between peak ground acceleration and other ground motion parameters shows that peak ground acceleration is proportional to the probability of damage,and the probability of bridge structure damage is less than 50%.The larger the magnitude,the smaller the epicenter distance and the larger the peak ground acceleration.