Response analysis of long-period seismic action in far field to long-span continuous beam bridge with isolated high piers

Wang Yanan,Wang Fujie,Tang Guangwu,Chen Yuan,Liu Haiming,H Zhang,H Abdul Aziz

doi:10.1051/e3sconf/202127602030

Wang Yanan, Wang Fujie + Show 5 more

Open Access

https://doi.org/10.1051/e3sconf/202127602030

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Abstract

In order to study the influence of far-field long-period seismic waves on high-pier and long-span continuous beam bridge, taking a high-pier and long-span continuous beam bridge with span arrangement of (95+170+95) m as an example, a numerical analysis model is established based on finite element software. According to the established wave selection criterion, 10 far-field long-period seismic records and 10 ordinary seismic records are selected from the strong earthquake record database. Using nonlinear time history analysis method, the difference of seismic response of long-span continuous beam bridge with isolated high piers under the action of ordinary ground motion and far-field long-period ground motion is studied. The results show that compared with the ordinary ground motion, the seismic response of long-span continuous beam bridge with isolated high piers is obviously increased under the action of long-period ground motion in the far field. When building isolated long-span bridges in areas with great influence of long-period ground motion in the far field, attention should be paid to the adverse effects caused by the frequency spectrum characteristics of ground motion.

Highlights

With the development of the western region, long-span bridges with high piers with large overall stiffness, good structural stress and strong spanning capacity have been widely used
Jia Yi [2] studied the seismic system of multi-span continuous girder bridges in high intensity areas
3.1 Selection of seismic waves As shown in tables 1 and 2, in order to analyze the seismic response of long-span continuous girder bridges with high piers, 10 long-period seismic waves and 10 ordinary seismic waves are selected from the strong earthquake record database of Pacific earthquake Engineering Research Center (PEER)

Summary

Introduction

With the development of the western region, long-span bridges with high piers with large overall stiffness, good structural stress and strong spanning capacity have been widely used. Because the natural vibration period of high-pier and long-span continuous beam bridge is large, which has gone beyond the scope of conventional bridges, it is very important to study its seismic response under long period in far field. There are relatively few studies on the dynamic behavior of high-pier and long-span continuous beam bridges under long-period ground motions, most existing studies use ordinary strong ground motion records. Compared with ordinary strong ground motion, long-period ground motion is more likely to have adverse effects on long-period structures such as high-rise buildings, seismic isolated structures and long-span bridges due to its rich low-frequency components.based on the selection of far-field long-period seismic records, this paper studies the seismic performance of high-pier and long-span continuous beam bridges under far-field long-period ground motions

Project overview and analysis model

Selection and analysis of seismic records

Rio Dell Overpass

Seismic response analysis

Conclusion