Characteristic Response Analysis of the Bridge Pier under Multi-Pulse Near-Fault Earthquake Excitation

• 1、Institude of Earthquake Engineering,Dalian University of Technology,Dalian LiaoNing 116024
• 2、State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian LiaoNing 116024

Abstract：In this paper, 17 sets out of 22sets earthquake are characterized as pulse-like near-fault earthquake motion based on the multi-Pulse Analysis, and the relevant parameters are calculated such as pulse index, pulse period and number of significant wavelets. And 17 sets of acceleration time series whose spectrum are compatible with target spectrum are obtained by means of the time domain matching strategy. Four bridge piers are modeled with OpenSEES while the integration method is modified as Gauss-Lobatto method which enables the obtain of the response at both element ends. Analysis of the resulting response of the four bridge piers indicated that material reinforcingsteel01 is superior to material steel02 in the case of modeling the degradation of strength and stiffness . The relative difference of displacement ductility capability between finite element model and the experiment keeps within 5%. The pier height and reinforcing steel ratio impose great influence on the shear and moment at the foot of pier, while displacement ductility capability is controlled only by reinforcing steel ratio. The safety storage of pier displacement ductility increases with the increasing pier height while the reinforcing steel ratio remains unchanged.

Keywords： earthquake-proof,earthquake-resistant,explosion-resistant structure Multi-Pulse Analysis near-fault bridge pier ductility