|Table of Contents|

Seismic fragility analysis of reinforced concrete bridge piers reinforced with UHPC and high-strength steel bars(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2026年02期
Page:
107-119
Research Field:
桥隧工程
Publishing date:

Info

Title:
Seismic fragility analysis of reinforced concrete bridge piers reinforced with UHPC and high-strength steel bars
Author(s):
FU Tao1;  JIANG Runhao1;  YAN Xu2;  LI Hengxiao1;  ZHANG Jinwen1;  XU Longwei1
(1. School of Transportation Engineering, Shandong Jianzhu University, Jinan 250102, Shandong, China; 2. Shandong Luqiao Group Co., Ltd, Jinan 250101, Shandong, China)
Keywords:
reinforced concrete bridge pier;  quasi-static test;  UHPC reinforcement;  time-history analysis;  seismic fragility
PACS:
U443.22
DOI:
10.19815/j.jace.2024.11079
Abstract:
In order to study the seismic fragility of reinforced concrete bridge piers reinforced with ultra-high performance concrete(UHPC)and HTRB600E high-strength steel bars, based on the drift rate of the pier top obtained from quasi-static tests, the damage states were divided into five types, consisting no damage, slight damage, moderate damage, severe damage, and collapse damage. A finite element model of the bridge pier was established using ABAQUS software, and the finite element model was calibrated based on the results of quasi-static tests to verify its accuracy. On the basis of dynamic time-history response analysis of bridge piers, the fragility curves of bridge piers was established to quantify the exceedance probability of various damage states of bridge piers under different seismic intensities. The results show that under the action of cyclic loads, the reinforced bridge pier first develops into a weak section at the bottom of the pier, and eventually forms a plastic hinge area, exhibiting bending failure characteristics. After reinforcement, the top pier body of reinforced section of the bridge pier first develops into a plastic hinge zone, and the pier body shows obvious bending shear failure characteristics. With the increase of peak ground acceleration(PGA), the exceedance probability of damage to bridge piers significantly increases. Under the same PGA conditions, the exceedance probability of slight, moderate, and severe damage to bridge pier after reinforcement is reduced to varying degrees compared to the bridge pier before reinforcement, and the exceedance probability of collapse damage is basically the same for both. The method of section enlargement based on UHPC and high-strength steel bars effectively restores and improves the seismic performance of reinforced concrete bridge piers, reduces the seismic vulnerability, and achieves significant reinforcement effects.

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Last Update: 2026-04-01