Effect of ground motion characteristics on sliding response of elastomeric pad bearings in highway bridges
-
摘要: 针对我国常见的板式橡胶支座类型公路桥梁因支座与墩梁间无连接措施、在地震作用下频发主梁移位甚至落梁等震害的现状，采用平滑动支座单元模拟板式橡胶支座的滑动效应，通过对一单墩模型的非线性地震反应时程分析，探讨了影响板式橡胶支座滑动反应的主要因素，研究了包括地震动峰值加速度、地震动频谱特性以及地震动加速度时程曲线形状细节等地震动特性对公路桥梁板式橡胶支座滑动反应的影响。研究表明：板式橡胶支座滑动反应是随地震动峰值加速度Ap、地震动峰值加速度与峰值速度比值Ap/vp变化的函数；地震动加速度时程曲线形状细节也是影响支座滑动反应的一个重要因素。设计人员在对板式橡胶支座类型桥梁进行抗震设计时，应注意选择与场地条件相匹配的地震动输入；利用工程经验判断支座滑动反应时，应重视地震动加速度时程曲线形状细节的反常影响。Abstract: Facing the frequently occurred seismic damage of shifting or even unseating of girders in highway bridges whose elastomeric pad bearings are not connected appropriately with the pier and girder, this paper discusses the main influencing factors and presents the effect of ground motion characteristics on sliding response of elastomeric pad bearings based on non-linear time-history analysis of a single pier model, in which the sliding effect of elastomeric pad bearings is characterized by a flat sliding bearing element. The ground motion characteristics studied in this paper include peak ground acceleration, dominant frequency and energy content, and details of the pulses contained in ground motions. The results show that the sliding response of elastomeric pad bearings is a function of the peak ground acceleration and the ratio of peak ground acceleration to peak ground velocity. Besides, the details of the pulses contained in ground motions may have significant influence on the sliding response. Thus, in order to conduct a correct seismic design of highway bridges on elastomeric pad bearings, the seismic ground motions should be chosen according to the characteristics of the bridge site, and particular attention should be paid to the possible unexpected effect of the details of pulse in ground motion when using empirical statistical correlations to predict the sliding response in individual cases.
-
-
[1] 胡兆同, 陈万春. 桥梁通用构造及简支梁桥[M]. 北京: 人民交通出版社, 1999: 135.
Hu Zhaotong, Chen Wanchun. Universal bridge structure and simple supported beam bridge [M]. Beijing: China Communications Press, 1999: 135. (in Chinese)[2] 范立础, 聂利英, 李建中. 地震作用下板式橡胶支座滑动的动力性能分析[J]. 中国公路学报, 2003, 16(4): 30―35.
Fan Lichu, Nie Liying, Li Jianzhong. Dynamic characteristic analysis of laminated rubber bearing sliding under earthquake [J]. China Journal of Highway and Transport, 2003, 16(4): 30―35. (in Chinese)[3] 李建中, 范立础. 汶川桥梁震害分析与抗震设计对策[J]. 公路, 2009, 5: 122―128.
Li Jianzhong, Fan Lichu. Wenchuan bridge seismic damage analysis and seismic design countermeasures [J]. Highway, 2009, 5: 122―128. (in Chinese)[4] JTG/T B02-01-2008, 公路桥梁抗震设计细则[S]. 北京: 人民交通出版社, 2008.
JTG/T B02-01-2008, Guidelines for seismic design of highway bridges [S]. Beijing: China Communications Press, 2008. (in Chinese)[5] Mazzoni S, McKenna F, Scott M H, Fenves G L. Open system for earthquake engineering simulation (OpenSees): OpenSees command language manual [M]. Pacific Earthquake Engineering Center, University of California, Berkeley, 2007. [6] 范立础. 桥梁抗震[M]. 上海: 同济大学出版社, 1997: 84―89.
Fan Lichu. Seismic design for bridges [M]. Shanghai: Tongji University Press, 1997: 84―89. (in Chinese)[7] 范立础, 胡世德, 叶爱君. 大跨度桥梁抗震设计[M]. 北京: 人民交通出版社2001: 89―96.
Fan Lichu, Hu Shide, Ye Aijun. Seismic design for long-span bridges [M]. Beijing: China Communications Press, 2001: 89―96. (in Chinese)[8] JT/T 4-2004, 公路桥梁板式橡胶支座[S]. 北京: 人民交通出版社, 2004.
JT/T 4-2004, Plate type elastomeric pad bearings for highway bridges [S]. Beijing: China Communications Press, 2004. (in Chinese)[9] 聂利英, 李建中, 范立础. 弹塑性纤维梁柱单元及其单元参数分析[J]. 工程力学, 2004, 21(3): 15―20.
Nie Liying, Li Jianzhong, Fan Lichu. Elastic-plastic fiber beam-column element and its parametric analysis [J]. Engineering Mechanics, 2004, 21(3): 15―20. (in Chinese)[10] Kent D C, Park R. Flexural members with confined concrete [J]. Journal of the Structural Division, 1971, 97(7): 1969―1990. [11] Scott B D, Park R, Priestley M J N. Stress-strain behavior of concrete confined by overlapping hoops at low and high strain rates [J]. ACI Journal, 1982, 79(1): 13―27. [12] Menegotto M, Pinto P E. Method of analysis for cyclically loaded RC plane frames including changes in geometry and non-elastic behavior of elements under combined normal force and bending [C]. Proceedings of IABSE Symposium on Resistance and Ultimate Deformability of Structures, 1973, Lisbon, Portugal. [13] 胡聿贤. 地震工程学[M]. 北京: 地震出版社, 2005: 150.
Hu Yuxian. Earthquake engineering [M]. Beijing: Seismological Press, 2005: 150. (in Chinese) -
期刊类型引用(4)
1. 张玉建，杨坤，何超，余少乐，姚士帅，孙璠，卫林强. 基于改进模拟退火算法的单层网壳结构拆除施工路径优化方法. 建筑结构. 2025(05): 107-116 . 
百度学术
2. 朱钊辰，罗永峰，曲扬，黄青隆. 基于精细化构件模型的网壳结构动力响应分析. 建筑结构学报. 2020(02): 115-124 . 百度学术
3. 李玉刚，范峰，洪汉平. 基于小样本记录的柱面网壳结构地震响应评估. 工程力学. 2020(05): 228-236 . 本站查看
4. 朱钊辰，罗永峰，刘怡鹏，黄青隆，高喜欣，曲扬. 单层球面网壳MTMD振动控制试验研究. 东南大学学报(自然科学版). 2019(04): 696-704 . 百度学术
其他类型引用(4)
计量
- 文章访问数: 653
- HTML全文浏览量: 18
- PDF下载量: 130
- 被引次数: 8
下载:
