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风暴潮、浪作用下中小型跨海桥梁破坏形式与数值模拟研究
王玉琦
中铁十九局集团第六工程有限公司, 江苏 无锡 214028
摘要:
强台风形成的巨浪、风暴潮对跨海桥梁的安全造成了严重威胁,为探讨台风风暴潮、浪共同作用下中小型跨海桥梁上部结构和下部结构的破坏机理及台风风暴潮期间不同水位下的波浪对下部结构的作用规律,开展了台风风暴潮、浪共同作用下中小型跨海桥梁破坏形式调研,发现风暴潮、浪作用下中小型跨海桥梁上部结构的破坏形式主要有梁体离位、梁体脱落和梁体断裂,主要原因为梁体被迫发生无约束运动;下部结构破坏主要表现为结构偏移、倒塌以及盖梁连接失效破坏,主要原因为水动力作用较强及上部结构撞击。通过CFD三维数值模拟研究了桥梁下部结构波浪荷载,给出了考虑风暴潮水位下波浪冲击桥墩的经验公式。根据调研及数值模拟,提出了设计及施工建议。
关键词:  风暴潮  跨海桥梁  破坏形式  破坏原因  水动力
DOI:10.11835/j.issn.2096-6717.2019.136
分类号:U447
基金项目:
Failure forms and numerical simulation of small and medium-sized sea-crossing bridges under storm surge and wave
Wang Yuqi
China Railway 19 th Bureau Group Sixth Engineering Co., Ltd, Wuxi 214028, Jiangsu, P. R. China
Abstract:
Waves and storm surges induced by strong typhoons pose a serious threat to the safety of sea-crossing bridges. In order to study the damage mechanism of the superstructure and the substructure of the small and medium-sized sea-crossing bridges under the combined action of storm surge and wave, and the affecting law of wave under different water levels during the storm surge on the substructure, the damage patterns of the small and medium-sized sea-crossing bridges induced by the combined action of typhoon storm surge and wave are investigated. Survey results show that the failure patterns of the superstructure of the small and medium-sized sea-crossing bridge under the action of storm surge and wave mainly include beam body dislocation, beam body shedding and beam body fracture. The main failure reasons are that the beam is forced to undergo unconstrained movement. The failure patterns of the substructure are mainly structural deviation, collapse and failure of the girder connection failure, and the main cause is large hydrodynamic effect and impact of superstructure. Subsequently, wave loads on bridge substructure are studied by CFD three-dimensional numerical simulation and an empirical formula of wave impact on pier under storm surge is obtained. Finally, based on the investigation and numerical simulation, some suggestions and measures are proposed for structural design and structural construction.
Key words:  storm surge  sea-crossing bridge  damage modes  damage reason  hydrodynamic
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