| 高烈度区深水斜拉桥动水效应及抗震体系研究 |
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| 引用本文： | 樊冰,李永庆,宋松林,安艳涛.高烈度区深水斜拉桥动水效应及抗震体系研究[J].西北地震学报,2022,44(5):1024-1033. |
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| 作者姓名： | 樊冰 李永庆 宋松林 安艳涛 |
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| 作者单位： | 中交第一公路勘察设计研究院有限公司,陕西 西安 710075 |
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| 基金项目： | 中交第一公路勘察设计研究院有限公司科技创新基金项目(KCJJ2021-07)；中交第一公路勘察设计研究院有限公司科技创新基金项目(KCJJ2021-20)；交通运输行业重点科技项目(2021-MS1-049) |
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| 摘 要： | 位于高烈度区的深水斜拉桥在地震下不仅会受到强震的作用,还会受到附近水体的作用,结构抗震要求高,选择合理的抗震体系非常重要.以云南格巧高速双河特大桥为工程实例,分析动水作用对斜拉桥地震响应的影响及其与地震强度的关系,在此基础上对斜拉桥的纵、横向抗震体系展开研究并给出合理建议.结果表明,动水作用会增大索塔塔底内力和结构整体位移响应,且对剪力的影响最大;动水对结构各响应的放大作用随地震强度增加呈现出增减不一的变化趋势,抗震设计时应分别考虑各级地震下的动水效应;索塔、辅助墩和桥台处均设置黏滞阻尼器等阻尼约束的纵向协同抗震体系能够最有效减小墩、塔底纵向内力及结构纵向位移,建议作为斜拉桥纵向抗震体系; 斜拉桥横向推荐采用索塔处设置固定约束、墩台处设置钢阻尼器等弹塑性约束的组合约束体系,该体系能同时降低墩、塔底横向内力,并有效控制结构整体横向位移响应.
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| 关 键 词： | 高烈度区 深水斜拉桥 动水作用 地震响应 抗震体系 |
Hydrodynamic effect and seismic system of a deep-water cable-stayed bridge in high-seismic-intensity areas |
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| FAN Bing,LI Yongqing,SONG Songlin,AN Yantao.Hydrodynamic effect and seismic system of a deep-water cable-stayed bridge in high-seismic-intensity areas[J].Northwestern Seismological Journal,2022,44(5):1024-1033. |
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| Authors: | FAN Bing LI Yongqing SONG Songlin AN Yantao |
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| Institution: | CCCC First Highway Consultants Co., Ltd., Xi''an 710075 , Shaanxi, China |
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| Abstract: | Under earthquake action, deep-water cable-stayed bridges located in high-seismic-intensity areas are affected by the strong earthquake and the nearby water body. Therefore, choosing a reasonable seismic system is important for the structure. Here with the Shuanghe super-large bridge of Geqiao Expressway in Yunnan Province taken as an example, the influence of hydrodynamic effect on the seismic response of cable-stayed bridge and its relationship with seismic intensity were analyzed. On this basis, the longitudinal and transverse seismic systems of cable-stayed bridges were studied. Results show that the internal force at the tower bottom and the structural displacement response will be increased by the hydrodynamic action, and the greatest effect appears in shear force. The amplification effects of hydrodynamic action on different responses of the structure vary with the increase in earthquake intensity. Thus, hydrodynamic action under various earthquakes should be considered in the seismic design. The longitudinal cooperative seismic system with viscous dampers set at the cable tower, auxiliary pier, and abutment was recommended for the cable-stayed bridge because it can most effectively reduce the longitudinal internal force and longitudinal displacement of the pier and tower bottom. The combined restraint system with fixed constraints at the cable tower and elastic-plastic constraints such as steel damper at the pier and abutment was recommended for the cable-stayed bridge. The transverse internal forces at the bottom of the pier and tower could be reduced at the same time, and the overall transverse displacement response of the structure could be effectively controlled by using the system. |
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