本文關(guān)鍵詞： 斜拉橋 鋼錨箱 混凝土錨固塊 混合單元模型 力學(xué)特性　出處：《西南交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來,斜拉橋發(fā)展十分迅速,國內(nèi)外多座斜拉橋的跨徑己進入特大跨徑范圍內(nèi)。斜拉橋索梁錨固結(jié)構(gòu)受力集中、構(gòu)造復(fù)雜,是斜拉索連接主梁的重要結(jié)構(gòu),其受力狀態(tài)是衡量橋梁結(jié)構(gòu)工作性能的重要指標(biāo)。因此,在斜拉橋設(shè)計研究中,索梁錨固結(jié)構(gòu)往往作為重要構(gòu)件成為斜拉橋研究者重點關(guān)心的部位之一。目前為止,國內(nèi)外研究者往往運用節(jié)段模型試驗手段研究斜拉索與主梁錨固結(jié)構(gòu)的力學(xué)特性,節(jié)段模型通常僅加載斜拉索的索力,端部的邊界按固定或者自由處理。試驗?zāi)Ｐ瓦吔鐥l件的不確定性,造成節(jié)段模型與實橋結(jié)構(gòu)受力存在差異,能不能把節(jié)段模型試驗結(jié)果用于實橋結(jié)構(gòu)還有待確定。同時考慮到經(jīng)濟性問題,全橋模型試驗又是不可行的,且索梁錨固結(jié)構(gòu)構(gòu)造形式各異,局部應(yīng)力分布各不相同,更不可能做大量的全橋模型試驗。因此,準(zhǔn)確確定節(jié)段模型的邊界條件尤為重要,是決定節(jié)段模型試驗成敗的關(guān)鍵。四川省某斜拉橋為獨塔單索面混合梁斜拉橋,鋼箱梁部分和混凝土箱梁部分的索梁錨固結(jié)構(gòu)分別采用鋼錨箱式和混凝土錨塊式錨固結(jié)構(gòu)。本文運用橋梁結(jié)構(gòu)局部計算的精細(xì)化計算方法一混合單元模型法,對該橋兩種索梁錨固結(jié)構(gòu)進行受力分析,研究該橋索梁錨固結(jié)構(gòu)的受力特點。全橋混合單元模型利用通用有限元軟件Midas/Civil建立,模型中索梁錨固結(jié)構(gòu)及附近梁體用板或?qū)嶓w單元模擬,全橋其它部位用梁單元模擬,計算分析斜拉索與主梁錨固區(qū)應(yīng)力分布規(guī)律。通過混合單元模型計算,給出兩種索梁錨固結(jié)構(gòu)在不同荷載作用下應(yīng)力分布,分析應(yīng)力集中及傳力機理。最后,結(jié)合相關(guān)規(guī)范及現(xiàn)有的研究成果,評價該橋梁錨固結(jié)構(gòu)受力性能,并探討索梁錨固結(jié)構(gòu)的合理設(shè)計方法,用于指導(dǎo)結(jié)構(gòu)設(shè)計。
[Abstract]:In recent years, cable-stayed bridges have developed rapidly, and many cable-stayed bridges at home and abroad have entered the super-span range. Cable girder Anchorage structures of cable-stayed bridges are concentrated in force and complicated in structure, which is an important structure of cable-stayed cable-stayed bridge connecting main beam. The stress state is an important index to evaluate the performance of the bridge structure. Therefore, in the study of cable-stayed bridge design. Cable-beam Anchorage structure is often regarded as an important component of cable-stayed bridge researchers focus on one of the parts. So far. Researchers at home and abroad often use segmental model test to study the mechanical properties of cable and main beam Anchorage structure. The segmental model usually only loads cable force. The boundary of the end part is treated as fixed or free. The uncertainty of the boundary condition of the test model results in the difference between the segmental model and the real bridge structure. Whether the segmental model test results can be applied to the real bridge structure is still to be determined. Considering the economic problem, the full-bridge model test is not feasible, and the structure of cable beam Anchorage structure is different. The local stress distribution is different, and it is not possible to do a lot of full-bridge model tests. Therefore, it is very important to accurately determine the boundary conditions of the segmental model. A cable-stayed bridge in Sichuan Province is a cable-stayed bridge with single tower and single cable. The cable girder Anchorage structure of steel box girder part and concrete box girder part are respectively steel anchor box structure and concrete anchor block type anchor structure. Two kinds of cable beam Anchorage structure of the bridge are analyzed and the mechanical characteristics of the cable beam Anchorage structure of the bridge are studied. The hybrid element model of the whole bridge is established by the general finite element software Midas/Civil. In the model, the cable beam Anchorage structure and the nearby beam body are simulated by plate or solid element, and other parts of the bridge are simulated by beam element. The stress distribution of cable and main beam Anchorage zone is calculated and analyzed. The mixed element model is used to calculate the stress distribution. The stress distribution of two kinds of cable-beam Anchorage structures under different loads is given, and the stress concentration and force transfer mechanism are analyzed. Finally, combined with relevant codes and existing research results, the mechanical performance of the bridge Anchorage structure is evaluated. The reasonable design method of cable-beam Anchorage structure is discussed to guide the structure design.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U448.27

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本文編號：1446064