【摘要】：近年來,隨著我國(guó)交通事業(yè)的迅猛發(fā)展,高等級(jí)公路開始進(jìn)入西部山區(qū),大跨徑曲線剛構(gòu)橋應(yīng)運(yùn)而生。大跨徑曲線連續(xù)剛構(gòu)橋結(jié)合了曲線梁橋和連續(xù)剛構(gòu)橋的受力特點(diǎn),由于“彎、剪、扭”耦合的受力特性,使得結(jié)構(gòu)分析變得更為復(fù)雜。本文以湖北宜昌涼臺(tái)河大橋?yàn)楸尘?采用大型通用有限元軟件MIDAS/Civil2012建模并進(jìn)行分析計(jì)算,針對(duì)大跨徑曲線連續(xù)剛構(gòu)橋收縮徐變和預(yù)應(yīng)力損失主要做了以下幾個(gè)方面的研究： (1)總結(jié)了曲線梁橋的發(fā)展史與現(xiàn)狀,介紹了曲線剛構(gòu)橋在我國(guó)的建設(shè)情況以及曲線剛構(gòu)橋常用的分析理論。 (2)以涼臺(tái)河大橋?yàn)楣こ瘫尘?采用空間直梁?jiǎn)卧⒖紤]曲率半徑的影響,建立了涼臺(tái)河大橋的有限元計(jì)算模型進(jìn)行了施工階段過程分析。 (3)通過涼臺(tái)河大橋現(xiàn)場(chǎng)實(shí)測(cè)的各項(xiàng)監(jiān)控?cái)?shù)據(jù)與模型計(jì)算的理論值對(duì)比分析,表明MDAS/Civil能較好的模擬橋梁懸臂施工過程；本文所依據(jù)的分析理論和采用的計(jì)算方法能夠較好的反映實(shí)際情況,對(duì)同類橋型的施工控制具有一定的參考價(jià)值。 (4)在只改變橋梁的曲率半徑的前提下,分別建立了直線橋與多個(gè)曲線橋的空間計(jì)算模型,對(duì)不同曲率半徑下的曲線連續(xù)剛構(gòu)橋的收縮徐變效應(yīng)進(jìn)行了分析對(duì)比,得到了收縮徐變對(duì)曲線連續(xù)剛構(gòu)橋內(nèi)力和變.形的影響。 (5)通過改變橋梁的曲率半徑,分析了大跨徑曲線連續(xù)剛構(gòu)橋的預(yù)應(yīng)力損失,得到了不同曲率半徑的曲線連續(xù)剛構(gòu)橋的各項(xiàng)分項(xiàng)預(yù)應(yīng)力損失并進(jìn)行了對(duì)比分析。
[Abstract]:In recent years, with the rapid development of China's transportation industry, high-grade highways began to enter the western mountainous areas, and long-span curved rigid frame bridges emerged as the times require. The long-span curved continuous rigid frame bridge combines the stress characteristics of curved beam bridge and continuous rigid frame bridge. The structural analysis becomes more complicated because of the coupling force characteristics of "bending, shear and torsion". Based on the Liangtai River Bridge in Yichang, Hubei Province, the large scale finite element software MIDAS/Civil2012 is used to model and analyze and calculate. In this paper, the shrinkage creep and prestress loss of long-span curved continuous rigid frame bridges are studied in the following aspects: (1) the history and present situation of curved girder bridges are summarized. This paper introduces the construction situation of curved rigid frame bridge in China and the common analysis theory of curved rigid frame bridge. (2) taking Liangtai River Bridge as the engineering background, the space straight beam element is adopted and the influence of curvature radius is considered. The finite element calculation model of Liangtai River Bridge is established and analyzed during the construction stage. (3) the theoretical values of the monitoring data and the model calculation are compared and analyzed through the field monitoring data of Liangtai River Bridge. The results show that MDAS/Civil can simulate the cantilever construction process of bridge, and the analysis theory and calculation method used in this paper can better reflect the actual situation. It has certain reference value for the construction control of the similar bridge type. (4) on the premise of changing the curvature radius of the bridge, the spatial calculation models of the straight line bridge and several curved bridges are established respectively. The shrinkage and creep effects of curved continuous rigid frame bridges with different curvature radii are analyzed and compared, and the internal forces and changes of curved continuous rigid frame bridges are obtained. (5) by changing the curvature radius of the bridge, the prestressing loss of the long-span curved continuous rigid frame bridge is analyzed. The prestressing loss of curved continuous rigid frame bridge with different curvature radius is obtained and compared.
【學(xué)位授予單位】：中南林業(yè)科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441.5;U448.23

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