【摘要】：近十幾年來,隨著經(jīng)濟(jì)實(shí)力的增強(qiáng)和工程技術(shù)水平的提高,我國(guó)在沿海地區(qū)修建了一批連接大陸和島嶼地區(qū)的跨海橋梁,為促進(jìn)島嶼地區(qū)的經(jīng)濟(jì)發(fā)展提供了有力的保障。但我國(guó)作為全世界受臺(tái)風(fēng)災(zāi)害影響最嚴(yán)重的三個(gè)國(guó)家之一,每年都會(huì)因臺(tái)風(fēng)造成大量人員傷亡,財(cái)產(chǎn)損失和海洋工程建筑物的破壞。雖然我國(guó)尚未發(fā)生在臺(tái)風(fēng)來臨時(shí)跨海橋梁受波浪荷載作用破壞失事的案例,仍很有必要未雨綢繆針對(duì)跨海橋梁在波浪荷載作用下的受力及破壞開展相關(guān)研究。本文首先綜述了該課題的國(guó)內(nèi)外研究現(xiàn)狀,在總結(jié)已有研究成果的同時(shí)指出了國(guó)外已有研究工作主要針對(duì)肋梁式橋梁,橋型較為落后。在此基礎(chǔ)上,結(jié)合我國(guó)跨海橋梁建設(shè)的實(shí)際情況,確定以主梁結(jié)構(gòu)為箱梁式的跨海橋梁作為研究對(duì)象。隨后選取建設(shè)中的主梁結(jié)構(gòu)為箱梁式的福建平潭海峽公鐵兩用大橋?yàn)檠芯繉?duì)象,在無反射波浪水槽中建立主梁結(jié)構(gòu)的斷面物理模型。以橋址處的波浪和水文情況為依據(jù)確定了各工況下的輸入條件并進(jìn)行試驗(yàn)。試驗(yàn)測(cè)定了箱梁模型在各工況下的受力情況。試驗(yàn)分析表明:箱梁結(jié)構(gòu)所受豎直波浪力是造成其失穩(wěn)破壞的主要?jiǎng)恿σ蛩?豎直波浪力的峰值通常出現(xiàn)在海面略高于箱梁頂板的工況下;箱梁底邊高程的變化對(duì)豎直波浪力的變化影響很小但是對(duì)水平波浪力有一定的影響。最后,對(duì)本次試驗(yàn)進(jìn)行了總結(jié),并提出了研究工作的進(jìn)一步開展方向。
[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.
【學(xué)位授予單位】：華北水利水電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U446.1

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