波浪作用下箱梁式跨海桥梁受力试验研究

发布时间：2018-11-13 13:50

【摘要】：近十几年来,随着经济实力的增强和工程技术水平的提高,我国在沿海地区修建了一批连接大陆和岛屿地区的跨海桥梁,为促进岛屿地区的经济发展提供了有力的保障。但我国作为全世界受台风灾害影响最严重的三个国家之一,每年都会因台风造成大量人员伤亡,财产损失和海洋工程建筑物的破坏。虽然我国尚未发生在台风来临时跨海桥梁受波浪荷载作用破坏失事的案例,仍很有必要未雨绸缪针对跨海桥梁在波浪荷载作用下的受力及破坏开展相关研究。本文首先综述了该课题的国内外研究现状,在总结已有研究成果的同时指出了国外已有研究工作主要针对肋梁式桥梁,桥型较为落后。在此基础上,结合我国跨海桥梁建设的实际情况,确定以主梁结构为箱梁式的跨海桥梁作为研究对象。随后选取建设中的主梁结构为箱梁式的福建平潭海峡公铁两用大桥为研究对象,在无反射波浪水槽中建立主梁结构的断面物理模型。以桥址处的波浪和水文情况为依据确定了各工况下的输入条件并进行试验。试验测定了箱梁模型在各工况下的受力情况。试验分析表明:箱梁结构所受竖直波浪力是造成其失稳破坏的主要动力因素;竖直波浪力的峰值通常出现在海面略高于箱梁顶板的工况下;箱梁底边高程的变化对竖直波浪力的变化影响很小但是对水平波浪力有一定的影响。最后,对本次试验进行了总结,并提出了研究工作的进一步开展方向。
[Abstract]:In the past decade, with the enhancement of economic strength and the improvement of engineering technology, China has built a number of cross-sea bridges connecting the mainland and the island areas in the coastal areas, which provides a strong guarantee for promoting the economic development of the island areas. However, as one of the three countries most seriously affected by typhoon disaster in the world, our country will cause a large number of casualties, property losses and damage to marine engineering buildings every year. Although China has not yet taken place in the case of sea crossing bridges damaged by wave loads when typhoons come, it is still necessary to make a good plan to carry out relevant research on the force and damage of sea crossing bridges under the action of wave loads in advance. In this paper, the current situation of research on this subject at home and abroad is summarized, and at the same time, it is pointed out that the existing research work in foreign countries is mainly aimed at ribbed girder bridges, and the bridge type is relatively backward. On this basis, combined with the actual situation of cross-sea bridge construction in China, the main girder structure as box girder cross-sea bridge as the research object. Then the cross-section physical model of the main girder structure in the non-reflective wave flume was established by selecting the main girder structure as the box girder bridge in the Pingtan Strait of Fujian Province. According to the wave and hydrological conditions at the bridge site, the input conditions are determined and tested. The stress of the box girder model under various working conditions was measured. The experimental results show that the vertical wave force is the main dynamic factor causing the instability of the box girder structure, and the peak value of the vertical wave force usually appears in the condition that the sea surface is slightly higher than the roof of the box girder. The variation of bottom elevation of box girder has little effect on vertical wave force but has certain effect on horizontal wave force. Finally, the experiment is summarized and the direction of further research is put forward.
【学位授予单位】：华北水利水电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U446.1

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