[1]庞林,曾永平,陈克坚,等.近断层地震区铁路钢桁拱桥抗震性能和对策研究[J].高速铁路技术,2020,11(04):60-64,74.[doi:10.12098/j.issn.1674-8247.2020.04.012]
　PANG Lin,ZENG Yongping,CHEN Kejian,et al.Study on Seismic Behavior and Countermeasures of Steel Truss Railway Arch Bridges in Near-fault Seismic Zone[J].HIGH SPEED RAILWAY TECHNOLOGY,2020,11(04):60-64,74.[doi:10.12098/j.issn.1674-8247.2020.04.012]
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近断层地震区铁路钢桁拱桥抗震性能和对策研究()
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《高速铁路技术》[ISSN:1674-8247/CN:51-1730/U]

卷:
11卷
期数:
2020年04期
页码:
60-64,74
栏目:
出版日期:
2020-08-28

文章信息/Info

Title:
Study on Seismic Behavior and Countermeasures of Steel Truss Railway Arch Bridges in Near-fault Seismic Zone
文章编号:
1674—8247(2020)04—0060-05
作者:
庞林;  曾永平;  陈克坚;  刘力维;  董俊
中铁二院工程集团有限责任公司, 成都 610031
Author(s):
PANG Lin;  ZENG Yongping;  CHEN Kejian;  LIU Liwei;  DONG Jun
China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031 China
关键词:
近断层地震区|上承式拱桥|地震响应|减震设计|设防措施
Keywords:
near-fault seismic zone|deck arch bridge|seismic response|seismic design|fortification measures
分类号:
U442.5+5
DOI:
10.12098/j.issn.1674-8247.2020.04.012
文献标志码:
A
摘要:
为给近断层地震区修建上承式铁路钢桁拱桥提供技术支撑，本文以列衣大桥拱桥方案为研究对象，分析了具有长周期、大脉冲及高竖向分量特性的近场地震动和地震行波效应对钢桁拱桥地震响应的影响规律，并据此开展了减隔震装置设计参数及结构抗震性能优化设计研究。结果表明：（1）相对于按照规范反应谱拟合的远场地震动，具有长周期、大脉冲特性的近断层地震动将显著增大钢桁拱桥的地震响应，可达40%以上，同时竖向与水平向地震峰值加速度比值由0.65增大至1.0倍时，拱顶杆件应力增加46.3MPa；（2）本例中地震行波效应仅对拱顶下弦杆和拱底上弦杆产生不利影响，对其余杆件影响小于10%或小于一致加载结果；（3）优化墩梁之间减隔震装置的设计参数，合理匹配由主梁传递至下部结构的地震力可起到显著的减隔震效果；（4）采取减隔震措施后，拱脚为地震最不利位置，为进一步提高钢桁拱桥的抗震性能，不宜仅增大拱脚构件截面尺寸，在拱脚处灌注混凝土和减小上部结构重量往往可起到更好的效果。
Abstract:
In order to provide technical support for the construction of deck railway steel truss arch bridge in near-fault seismic zone, this paper takes the arch bridge scheme of Lieyi Bridge as the research object, analyzes the influence law of near-field ground motion and seismic traveling wave effect with long period, large pulse and high vertical component on the seismic response of steel truss arch bridge, and carries out the optimization design research of seismic isolation device design parameters and structural seismic behavior. The results show that: (1) Compared with the far-field ground motion fitted according to the design response spectrum of Chinese code, the near-fault ground motion with a long period and large pulse will significantly increase the seismic response of steel truss arch bridge, which can reach more than 40%. Meanwhile, when the ratio of vertical and horizontal peak acceleration increases from 0.65 to 1.0 times, the stress of vault bar will increase by 46.3 MPa. (2) In this case, the seismic traveling wave effect only has an adverse effect on the lower chord member of the vault and the upper chord member of the arch bottom, and the influence on other members is less than 10% or less than the uniform loading result. (3) Optimizing of the design parameters of seismic isolation devices between piers and girders, and reasonable match of the seismic force transmitted from the main girder to the substructure can achieve significant seismic isolation effects. (4) After seismic isolation measures are taken, the arch foot is the position with the highest risk during an earthquake. In order to further improve the seismic behavior of steel truss arch bridge, it is not advisable to increase the cross-section size of arch foot members only. It is always better to pour concrete at the arch foot and reduce the weight of superstructure.

备注/Memo

备注/Memo:
作者简介:庞林(1989-),男,高级工程师,博士。基金项目:四川省重点研发项目（2019YFG0001）；中国铁路总公司系统性重大项目（P2018G007）引文格式:庞林, 曾永平, 陈克坚, 等.近断层地震区铁路钢桁拱桥抗震性能和对策研究[J].高速铁路技术, 2020, 11(4):60-64.PANG Lin, ZENG Yongping, CHEN Kejian, et al. Study on Seismic Behavior and Countermeasures of Steel Truss Railway Arch Bridges in Near-fault Seismic Zone[J]. High Speed Railway Technology, 2020, 11(4):60-64.
更新日期/Last Update: 2020-08-28