|Table of Contents|

Displacement-restrained reinforcement and performance improvement of multi-span simply-supported beam bridge across strike-slip fault(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年6期
Page:
154-168
Research Field:
桥梁智能运维与防灾减灾
Publishing date:

Info

Title:
Displacement-restrained reinforcement and performance improvement of multi-span simply-supported beam bridge across strike-slip fault
Author(s):
SHI Yan1;  ZHAO Hao-miao1;  CHU Cun-jie2;  HAN Jian-ping1; LIU Yun-shuai1;  YANG Xiong1
(1. School of Civil and Hydraulic Engineering, Lanzhou University of Technology, Lanzhou 730050,Gansu, China; 2. Shandong Provincial Communications Planning and Design Institute Group Co., Ltd., Jinan 250101, Shandong, China)
Keywords:
bridge engineering;  unseating prevention;  finite element;  displacement-restrained reinforced bearing;  combined reinforcement system;  ground motion synthesis;  strike-slip fault
PACS:
U448.21
DOI:
-
Abstract:
To reduce the unseating risk of simply-supported beam bridges under strong earthquakes and to control the sliding displacement of bearings, a bearing with multi-stage sliding and displacement-restrained functions was proposed. The bearing employed a thin polyester plate to regulate the activation sequence of the sliding surface and utilized a circular limiting steel hoop to restrain the maximum sliding displacement, thus coordinately controlling the sliding and limiting of the bearing. Based on theoretical analysis, a simplified mechanical model and corresponding force-displacement relationship of the bearing were established. Furthermore, a combined reinforcement system, consisting of displacement-restrained reinforced bearing, viscous dampers, and buckling-restrained braces(BRBs), was developed to overcome the limitations of a single displacement-restrained reinforced bearing. A dynamic analysis model of a four-span simply-supported beam bridge was established using OpenSees. Forty sets of synthesized cross-fault ground motions based on velocity pulse-like characteristics were used as input. The displacement responses and damage states of critical components, such as bearings and piers, were systematically investigated. The effects of displacement-restrained reinforced bearing and combined reinforcement system on seismic performance of simply-supported beam bridges were analyzed. The research results indicate that the peak bearing displacement of simply-supported beam bridges equipped with displacement-restrained reinforced bearings reduces by nearly 30%. The limiting effect is comparable to that of lead rubber bearing(LRB). The displacement-restrained reinforced bearing generally outperforms LRB in amplifying the longitudinal peak displacement of the main girder, while exhibiting comparable performance in reducing the girder rotation. Compared with the bridge equipped only with displacement-restrained reinforced bearings, the combined reinforcement system reduces the longitudinal peak displacement of the main girder by approximately 50%. It decreases the lateral displacement of piers and mitigates pier damage, thereby enhancing the overall performance of the bridge. In conclusion, the proposed displacement-restrained reinforced bearing and combined reinforcement system can provide references for enhancing the unseating prevention capability and seismic design of simply-supported beam bridges in high-intensity seismic zones under cross-fault ground motions.4 tabs, 17 figs, 35 refs.

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Last Update: 2025-12-20