第33卷第1期
上木工程与管理学报
Vol 33 No
2016年1月
Journal of Civil Engineering and Management
Jan.2016
地震差动下边界一地基一
斜拉桥体系破坏特征
柳国环,练继建,燕翔',刘伟2
(1.天津大学a.建筑工程学院;b.水利工程仿真与安全国家重点实验室,天津30002
2.燕山大学土木工程学院,河北秦皇岛0604)
摘要:同时考虑边界条件和地基一结构相互作用对大跨桥梁结枃地震响应的影响是个复杂问题。本文以
大跨斜拉桥为例,通过开发的系列程序建立了边界地基一桩一斜拉桥结构的 ABAQUS模型,生成了目标场
地多点地震动,对比了不同地基边界条件对大跨斜拉桥结构自振特性的影响,探讨了地表/地下多点地震动作
用下、不同地基边界条件对大跨斜拉桥体系弹塑性发展过程及倒塌模式的影响规律。结果表明:(1)进行大跨
斜拉桥结构的抗震分析时,有必要考虑地基边界条件的影响;(2)地表多点地震动输入下,考虑地基一结构相
互作用时,大跨斜拉桥结枃的弹塑性发展过程和倒塌模式与单独斜拉桥不同;(3)粘弹性人工边界条件考虑了
周围土体对地基的作用,地基相对变形较小,对上部斜拉桥结构起到了一定的保护作用。
关键词:大跨斜拉桥;边界-地基一结构相互作用;多点地震动;弹塑性分析;倒塌分析
中图分类号:TU311.3;U442.515文献标识码:A文章编号:20950985(2016)01-004-10
Elasto-plasticity Analysis and Failure Characteristics of
ong-span Cable-stayed Bridge Considering Boundary-foundation Interaction
Under Multiple-support Seismic Excitations
LIU Guo-huan, LAN Jijian, YAN Xiang, LIU Wei
Tianjin University, Tianjin 30002, China; 2. School of Civil Engineering and Mechanis
(1. a School of Civil Engineering; b. State Key Laboratory Hydraulic Engineering Simulation and Safe
Yanshan University, Qinhuangdao 066004, China)
Abstract: Seismic response effect of the long-span bridge structure considering both boundary condition
and soil-structure interaction simultaneously is a complex problem. Taking a long-span cable-stayed
bridge as an example, the boundary-foundation-pile-cable-stayed bridge model was established by a
series of developed programs. The target site multi-support ground motions were also generated. The
different boundary conditions on the vibration characteristics effect of the long-span cable-stayed
bridge were compared. The effect of different boundary conditions on the elasto-plasticity development
process and collapse mode of the long-span cable-stayed bridge was also discussed under surface,
underground multi-support ground motions. The results indicate that: (1 )It is necessary to consider
the effect on the boundary conditions of the foundationin the seismic analysis of large-span
cable-stayed structure; (2 )When considering foundation-structure interaction, the elasto-plastic
development process and collapse mode of the large-span cable-stayed bridgeare different with the
single cable-stayed bridge under the surface multi-suppor ground motion; (3 )Aceounting forthe effect
of soil surroundedby the foundationin the viscous-spring artificial boundary condition, the foundation
deformation is relatively smallerand this plays a protective role in the upper cable-stayedstructure
Key words: long-spancable-stayed bridge; boundary-foundation-structure interaction; multi-supports
eismic excitations elasto-plasticity analysis; collapse analysis
收稿日期:2015-10-19修回日期:2015-11-03
作者简介:柳国环(1980-),男,天津人,副教授,博土,研究方向为工程结构动力计算(Email:light@tiu,edu.cn)
基金项目:国家自然科学基金(51408409);中国博七后科学基金(2011M50032);天津市应用基础与前沿技术研究计划(15J0QNU0740)
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