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

卷:

37卷

期数:

2020年04期

页码:

97-107

栏目:

出版日期:

2020-07-30

文章信息/Info

Title:

Seismic Response Analysis of Bridge Structures with Precast Segmental Bridge Piers Based on Different Isolation Systems

文章编号:

1673-2049(2020)04-0097-11

作者:

赵建锋,孟庆一,薛振兴,刘雪飞

(青岛理工大学 土木工程学院,山东 青岛 266033)

Author(s):

ZHAO Jian-feng, MENG Qing-yi, XUE Zhen-xing, LIU Xue-fei

(School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, Shandong, China)

关键词:

桥梁抗震;  预制拼装桥墩;  桥梁结构;  隔震体系;  动力时程分析

Keywords:

seismic resistance of bridge;  precast segmental bridge pier;  bridge structure;  isolation system;  dynamic time history analysis

分类号:

TU352.1

DOI:

10.19815/j.jace.2019.09054

文献标志码:

A

摘要:

为了研究预制拼装桥墩桥梁结构的地震响应,基于OpenSEES有限元分析软件建立墩顶隔震和墩底隔震的预制拼装桥墩连续梁桥分析模型; 通过分析桥梁模型在3组不同强度、不同特性地震动激励下的动力特性、位移、内力、残余位移、预应力筋预应力、接缝压力等参数的变化,对隔震体系的隔震效果进行评估并给出了墩底隔震桥梁的设计建议。结果表明:预制拼装桥墩连续梁桥采用墩顶隔震体系和墩底隔震体系均可以大幅减小桥梁在地震中的位移和内力,延长桥梁自振周期; 采用墩梁固接、墩底隔震的桥梁结构相比于直接采用隔震支座连接墩梁的桥梁结构具有更长的自振周期、更小的震中位移和墩顶残余位移,表现出更好的隔震效果,在大地震中墩底隔震体系隔震优势更加明显; 采用墩底隔震体系的桥梁预制拼装桥墩会有更大的预应力变化、预应力损失和接缝竖向压力,因此隔震支座也应具备更高的性能。

Abstract:

In order to study the seismic responses of bridge structures with precast segmental bridge piers, based on OpenSEES finite element analysis software, the analysis models of continuous beam bridge with precast segmental bridge piers with top isolation and bottom isolation were established. The isolation effect of the isolated systems was evaluated by analyzing the dynamic characteristics, displacement, internal force, residual displacement, prestress of prestressed bar and joint pressure of the bridge model under three groups of ground motions with different intensities and characteristics. At the same time, suggestions for the design of pier bottom isolation bridges were put forward. The results show that both pier top isolation system and pier bottom isolation system can greatly reduce the displacement and internal force of the bridge in earthquake and prolong the natural vibration period of the bridge. The bridge structure with pier-beam consolidation and pier base isolation has longer natural vibration period, smaller epicenter displacement and residual displacement of pier top, which shows more superior isolation effect, the isolation advantage of pier base isolation system is more obvious in large earthquake. However, the precast segmental bridge pier in the bridge with base isolation system will have greater prestressed force change, prestressed force loss and joint vertical compressive force, and the isolation bearing should also have higher performance.

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备注/Memo

备注/Memo:

收稿日期:2019-11-07
基金项目:国家自然科学基金项目(51778314)
作者简介:赵建锋(1976-),男,河南叶县人,副教授,工学博士,E-mail:zhaojf@bjut.edu.cn。

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更新日期/Last Update: 2020-07-29