[1](石 岩,裴银海,张展宏,等.强震下斜交桥地震反应与减隔震性能分析[J].世界地震工程,2023,39(02):105-112.[doi:10.19994/j.cnki.WEE.2023.0034 ]
　(SHI Yan,PEI Yinhai,ZHANG Zhanhong,et al.Analysis of seismic response and isolation performance of skew bridge under strong ground motions[J].,2023,39(02):105-112.[doi:10.19994/j.cnki.WEE.2023.0034 ]
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强震下斜交桥地震反应与减隔震性能分析
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《世界地震工程》[ISSN:/CN:]

卷:
39
期数:
2023年02期
页码:
105-112
栏目:
常规论文
出版日期:
2023-05-15

文章信息/Info

Title:
Analysis of seismic response and isolation performance of skew bridge under strong ground motions
文章编号:
1007-6069(2023)02-0105-08
作者:
(石 岩; 裴银海; 张展宏; 赵昊淼; 朱明德)
兰州理工大学 土木工程学院,甘肃 兰州 730050
Author(s):
(SHI Yan;  PEI Yinhai;  ZHANG Zhanhong;  ZHAO Haomiao;  ZHU Mingde)
School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China
关键词:
斜交桥;  近断层地震动;  铅芯橡胶支座;  地震响应;  损伤分析
Keywords:
skew bridge;  near-fault ground motions;  Lead-Rubber Bearing(LRB);  seismic response;  damage analysis
分类号:
U448.41
DOI:
10.19994/j.cnki.WEE.2023.0034
文献标志码:
A
摘要:
针对斜交桥在破坏性地震中发生破坏和损伤的突出问题,采用铅芯橡胶支座(LRB)进行隔震和滞回耗能。基于OpenSees平台建立了不同斜度的传统非隔震和全桥采用LRB隔震的4跨斜交连续梁桥动力分析模型,沿2个水平方向输入远场地震动和具有向前方向性效应、滑冲效应以及无速度脉冲效应的近断层地震动,并进行非线性时程计算,研究桥墩和挡块的损伤状态、主梁旋转度、碰撞力与斜交桥斜度的关系以及LRB对斜交桥抗震性能的影响。结果表明:向前方向性效应和滑冲效应的脉冲型地震动作用下的斜交桥地震反应和损伤明显大于无速度脉冲近断层和远场地震动作用; 采用LRB隔震后,明显降低了固定墩的地震损伤,桥墩位移减震率可达到50%以上; LRB隔震桥主梁与挡块的间隙宜结合桥梁的地震风险和设计位移进行确定。
Abstract:
According to the prominent problem that the skew bridge will be damaged under destructive earthquake. Selecte the lead-rubber bearing(LRB)as the isolation device to seismic isolation and hysteretic energy dissipation. Based on OpenSees platform, the dynamic analysis models of traditional non-isolated and LRB isolated 4-span skew continuous beam bridges with different slope are established. The far field ground motion and near fault ground motion with forward directivity effect, fling step effect and no velocity pulse effect are input along two horizontal directions. And then the dynamic time-history analysis is carried out to study the the relationship between damage state of skew bridge, the rotation of main girder, collision force and slope. The influence of LRB on the seismic performance of skew bridge is also studied. The results show that the seismic response and damage of skew continuous girder bridge under the action of near-fault ground motions with the effects of forward directivity or fling step are obviously larger than those under the action of near-fault ground motions without velocity pulse and far-field motions, the seismic damage of the fixed piers is obviously reduced if LRBs are adopted, and the pier displacement damping rate can reach more than 50%. The gap between the main girder and the shear keys of the LRB seismic isolation bridge should be determined in accordance with the seismic risk and design displacement of the bridge.

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相似文献/References:

[1](葛超洋,孙治国,付建宇,等.近断层地震动下摇摆-自复位桥墩连续梁地震反应[J].世界地震工程,2023,39(02):113.[doi:10.19994/j.cnki.WEE.2023.0035 ]
　(GE Chaoyang,SUN Zhiguo,FU Jianyu,et al.Seismic response of continuous beam bridge with rocking-self-centering columns under near-fault ground motion[J].,2023,39(02):113.[doi:10.19994/j.cnki.WEE.2023.0035 ]

备注/Memo

备注/Memo:
收稿日期:2022-07-13; 修回日期:2022-09-16
基金项目:国家自然科学基金项目(51908265); 兰州理工大学红柳优青项目(04-061810)
作者简介:石 岩(1985 —),男,博士,副教授,主要从事桥梁抗震研究. E-mail:syky86@163.com

更新日期/Last Update: 1900-01-01