| 楔形挡块对中小跨径梁桥横向抗震性能的影响 |
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| 引用本文： | 赵竞,项长生,周宇,刘桂山.楔形挡块对中小跨径梁桥横向抗震性能的影响[J].西北地震学报,2020,42(1):22-31. |
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| 作者姓名： | 赵竞 项长生 周宇 刘桂山 |
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| 作者单位： | 兰州理工大学 土木工程学院, 甘肃 兰州 730050,兰州理工大学 土木工程学院, 甘肃 兰州 730050;兰州理工大学 西部土木工程防灾减灾教育部工程研究中心, 甘肃 兰州 730050,安徽建筑大学 土木工程学院, 安徽 合肥 230601,兰州理工大学 土木工程学院, 甘肃 兰州 730050 |
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| 基金项目： | 国家自然科学基金地区科学基金项目（51868045） |
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| 摘 要： | 在地震作用下中小跨径梁桥横向易出现落梁以及桥墩破坏。为了防止桥梁出现上述震害,提出以楔形挡块作为限位装置来提升桥梁的横向抗震性能。以一座3×20 m连续混凝土梁桥为例,通过OpenSees软件来建立有限元模型,在考虑板式橡胶支座的摩擦滑移效应、钢筋混凝土桥墩的非线性等力学效应的情况下,对其进行动力时程分析。引入主梁位移响应、桥墩顶部最大位移响应等作为指标,用柔性挡块、刚性挡块两种工况来与楔形挡块进行对比分析,并且分析楔形挡块不同角度对位移响应的影响。结果表明:楔形挡块角度设置合适时能够有效约束梁体位移响应,并且不显著提高桥墩顶部的位移响应。
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| 关 键 词： | 横向抗震性能 板式橡胶支座 楔形挡块 动力响应 |
| 收稿时间： | 2019/1/16 0:00:00 |
Effect of Wedge Block on the Transverse Seismic Performanceof Small- and Medium-Span Girder Bridges |
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| ZHAO Jing,XIANG Changsheng,ZHOU Yu and LIU Guishan.Effect of Wedge Block on the Transverse Seismic Performanceof Small- and Medium-Span Girder Bridges[J].Northwestern Seismological Journal,2020,42(1):22-31. |
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| Authors: | ZHAO Jing XIANG Changsheng ZHOU Yu and LIU Guishan |
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| Institution: | School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China,School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China;Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry ofEducation, Lanzhou University of Technology, Lanzhou 730050, Gansu, China,College of Civil Engineering, Anhui Jianzhu University, Hefei 230601, Anhui, China and School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China |
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| Abstract: | The phenomena of beam falling and broken piers are likely to happen to small and mid-span bridges under the action of an earthquake. To prevent such earthquake damage to these bridges, a wedge-shaped block was used as the limiter to enhance the transverse seismic performance of a bridge. Taking a 3 m×20 m continuous concrete bridge as an example, a finite element model was established by OpenSees. Dynamic time-history analysis was carried out after considering the friction-sliding effect of laminated rubber bearings and the nonlinear effect of the reinforced concrete pier. Displacement response of the main beam and the maximum displacement response of the pier top were introduced as indicators. Two working conditions, i.e., the flexible shear key and the rigid shear key, were used to compare and analyze the influence of different angles of the wedge block on the displacement response. Results showed that the wedge block can restrain the displacement response of the girder effectively when the wedge block angle is set properly, but does not significantly improve the displacement response of the pier top. |
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| Keywords: | transverse seismic performance laminated rubber bearing wedge block dynamic response |
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