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

卷:

期数:

2026年02期

页码:

107-119

栏目:

桥隧工程

出版日期:

2026-03-30

文章信息/Info

Title:

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

文章编号:

1673-2049(2026)02-0107-13

作者:

付涛¹,姜润豪¹,闫旭²,李恒箫¹,张劲文¹,徐龙伟¹

(1.山东建筑大学 交通工程学院,山东 济南 250101; 2. 山东省路桥集团有限公司,山东 济南 250101)

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)

关键词:

钢筋混凝土桥墩;  拟静力试验;  UHPC加固;  时程分析;  地震易损性

Keywords:

reinforced concrete bridge pier;  quasi-static test;  UHPC reinforcement;  time-history analysis;  seismic fragility

分类号:

U443.22

DOI:

10.19815/j.jace.2024.11079

文献标志码:

A

摘要:

为了研究超高性能混凝土(UHPC)与HTRB600E高强钢筋加固后钢筋混凝土桥墩的地震易损性,基于拟静力试验获得的桥墩墩顶漂移率,将其损伤状态划分为无破坏、轻微破坏、中等破坏、严重破坏以及倒塌破坏5种类型。采用ABAQUS有限元软件建立了桥墩有限元模型,根据拟静力试验结果对有限元模型进行标定,以验证有限元模型的准确性。在对桥墩进行动力时程反应分析的基础上,建立了桥墩的易损性曲线,量化了在不同地震烈度下桥墩发生各种损伤状态的超越概率。结果表明:往复荷载作用下,加固前桥墩在墩底率先发展成为薄弱截面,最终形成塑性铰区域,呈弯曲破坏特征; 加固后桥墩加固段顶部墩身率先发展成为塑性铰区,墩身呈现明显的弯剪破坏特征; 随着地震峰值加速度(PGA)的增加,桥墩发生损伤的超越概率显著上升; 在PGA相同的条件下,加固后桥墩发生轻微、中等及严重破坏状态的超越概率相较于加固前桥墩有不同程度的降低,两者发生倒塌破坏的超越概率基本一致; 基于UHPC和高强钢筋的增大截面法有效恢复和提高了钢筋混凝土桥墩的抗震性能,降低了桥墩的地震易损性,加固效果显著。

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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备注/Memo

备注/Memo:

收稿日期:2024-11-21
基金项目:山东省研究生教育教学改革研究重点项目(SDYJSJGB2024007); 山东省交通运输科技计划项目(2024B90); 山东省自然科学基金项目(ZR2021ME227)
作者简介:付 涛(1981-),男,工学博士,教授,E-mail:greenvillage_17@163.com。
Author resume: FU Tao(1981-), male, PhD, professor, E-mail: greenvillage_17@163.com.

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更新日期/Last Update: 2026-04-01