Study On The Seismic Design Method Of High Bridge Pier System Based On The Damage Synchronicity

High pier bridges will be required practically along with the construction of road network in the west of our country. However, engineers also have to overcome the harsh engineering conditions and make the high pier bridges have reasonable seismic capacity due to the earthquake activity in western region. In recent years, the attention of all parties have been attracted to the high pier bridge seismic problems, but so far a general and effective seismic design method has not been formed. Therefore, a new idea is needed to research the problems. All piers of bridge are taken as a system and regarded as the seismic research object. The earthquake damage of piers has been studied from the perspective of destruction synchronicity. Moreover, the utilization of the system seismic capacity has been analyzed. Based on it, a new design method aiming at getting the maximum seismic capacity of the bridge pier system has been proposed. In order to achieve this goal, a few aspects of research work have been made.The article reviewed the seismic research development trend of high pier bridges. The necessity of seismic research has been expounded from two aspects which were project construction condition and the earthquake influence to high bridge piers. The impact to the entire road network has been analyzed briefly when the bridges damaged in earthquake. It thoroughly introduced the development course of the current seismic design method and summarized the present research situation of the high pier bridges. Then, it analyzed the characteristics and existing deficiency of the high bridge pier.The design method based on the damage synchronization for high bridge pier system has been built on the basic of existing research results. The analysis entrance of this method is the intensity seismic design. The cross section stiffness between high and short pier has been optimized through the concept of iteration by using incremental dynamic time history analysis(IDA) method and fiber cross section analysis(SFA) method. This analysis method is compiled on the open system for earthquake engineering simulation(OpenSees) according to a specific engineering example.A program has been written in MATLAB, which is used to select ground motion records based on the dual frequency control of design spectrum. 3334 ground motion records at home and abroad are analyzed one by one in this program, and then the input for inelastic time history analysis of structure has been prepared.The damage synchronicity between high and short pier has been quantitatively analyzed on the OpenSees program. Analysis results have shown that the seismic design based on strength is not conducive to the utilization of the bridge pier system aseismic capacity. Through the comparison and analysis the effectiveness of the proposed method in this paper has been verified.