研究目的:为了提高连续刚构桥的抗震能力，通过在桥墩墩底横桥向增加一对钢筋混凝土构件(称之为“保险丝”)，提出一种具有熔断机制的摇摆桥墩连续刚构桥新型结构体系。研究结论:(1)通过对该结构体系与传统墩底固结结构体系在多遇地震、设计地震和罕遇地震作用下，结构地震需求、桥墩损伤情况的对比，发现该新型结构体系具有良好的抗震性能；(2)通过研究“保险丝”的混凝土破坏和钢筋滞回曲线的情况，说明在强震作用下“保险丝”发生破坏(称之为熔断)，其耗能作用和熔断后桥墩摇摆都减少了输入到结构中的地震能量，起到了很好的减震效果，使得桥梁在多遇地震作用下几乎不发生损伤，在设计地震和罕遇地震作用下把损伤程度降到最低、损伤范围减到最小；(3)研究成果对提高强震作用下桥梁的抗震性能具有指导意义。
Abstract
In order to improve the seismic capability of continuous rigid frame bridge, a new continuous rigid frame bridge system was proposed with fusing mechanism by adding a pair of reinforced concrete elements (called the "fuse") at the end of the bridge pier in cross-bridge.Research conclusions:(1)By comparison of the seismic demand and bridge pier damage of the new structure system and the traditional structure under low-lever earthquake, design earthquake and high-lever earthquake, it was found that the new structure system had good seismic performance. (2) By studying the destruction of concrete and hysteresis curve of steel bar of the "fuse", it was illustrated that after the "fuse" failure occurred under strong earthquake, the energy dissipation and the rocking of piers could reduce the input of the energy. The fusing mechanism can protect the bridge from almost no damage under the low-lever earthquake, and put the extent of damage and damage range to a minimum under design earthquake and high-lever earthquake. (3) The research results have a good guide for improving the seismic performance of bridges under strong earthquake.
关键词
地震 /
连续刚构桥 /
熔断机制 /
保险丝 /
摇摆桥墩
{{custom_keyword}} /
Key words
seismic /
continuous rigid frame bridge /
fusing mechanism /
fuse /
rocking pier
{{custom_keyword}} /
中图分类号：
U24
{{custom_clc.code}}
({{custom_clc.text}})
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 刘坤. 新疆伊犁河大桥主桥地震响应分析[J]. 铁道工程学报, 2012(6):59-64.
Liu Kun. Analysis of Seismic Response of Main Bridge of Yili River Bridge[J]. Journal of Railway Engineering Society, 2012(6):59-64.
[2] 周颖,吕西林.摇摆结构及自复位结构研究综述[J].建筑结构学报, 2011(9):1-10.
Zhou Ying, Lv Xilin. State-of-the-art on Rocking and Self-centering Structures[J]. Journal of Building Structures, 2011(9):1-10.
[3] HOUSNER G W. The Behavior of Inverted Pendulum Structures During Earthquakes[J]. Bulletin of the Seismological Society of America, 1963(2):403-417.
[4] HUKELBRIDGE A A, Clough R W. Preliminary Experimental Study of Seismic Uplift of a Steel Frame[R]. Report No.UCB/EERC-77 /22. Berkely: University of California, Berkely, 1977.
[5] HUKELBRIDGE A A. Earthquake Simulation Tests of a Nine Story Steel Frame with Columns Allowed to Uplift[R]. Report No.UCB/EERC-77 /23. Berkely: University of California, Berkely, 1977.
[6] PRIESTLEY M J N, Evison R J, Carr A J. Seismic Response of Structures Free to Rock on Their Foundations[J]. Bulletin of the New Zealand National Society for Earthquake Engineering, 1978(3):141-150.
[7] MANDER J B, Cheng C T. Seismic Resistance of Bridge Piers Based on Damage Avoidance Based on Damage Avoidance Design[R]. Technical Report NCEER, 97-0014, Buffalo, NY: NCREE, 1997.
[8] CHENG C T. New Paradigms for the Seismic Design and Retrofit of The Bridge Piers[D]. Buffalo: State University of New York at Buffalo, 1997.
[9] 郑锦铜, 江铭鸿. 刚性基础上摇晃桥柱系统地震反应研究[J]. 湖南大学学报(自然科学版),2013(4): 32-41.
Zheng Jintong,Jiang Minghong. Eismic Response of Rocking Pier System on Rigid Foundation[J]. Journal of Hunan University(Natural Sciences), 2013(4):32-41.
[10]HAO H, Daube M. Numerical Study of Rocking Pier in Mitigating Bridge Responses to Earthquake Ground Motions[C]. Tweed Heads, Gold Coast: Australian Earthquake Engineering Society 2012 Conference, 2012.
{{custom_fnGroup.title_cn}}
脚注
{{custom_fn.content}}
基金
中铁二院工程集团有限公司院级课题[13164190(13-15),14126165(14-15)
{{custom_fund}}
PDF(808 KB)
