【摘要】：斜拉橋是由塔、索、梁構(gòu)成的組合體系橋，由于斜拉索的存在使斜拉橋成為了高次超靜定結(jié)構(gòu)。雙層斜拉橋?qū)Τ蓸蚓�形的要求非常高，故雙層斜拉橋的設(shè)計(jì)存在一個(gè)通過設(shè)置預(yù)拱度來控制雙層斜拉橋成橋線形滿足設(shè)計(jì)線形的問題。如何確定斜拉橋的合理成橋狀態(tài)以及如何確定斜拉橋的合理施工狀態(tài)就涉及到合理的預(yù)拱度設(shè)置方案。 雙層斜拉橋上下兩層相互之間會(huì)產(chǎn)生顯著的影響，這直接導(dǎo)致了雙層斜拉橋比普通的單層斜拉橋受力和結(jié)構(gòu)變形情況復(fù)雜得多。本文依托四川省綿陽市城南新區(qū)一號(hào)橋?yàn)榉治鰧ο螅M(jìn)行了以下一些關(guān)于雙層斜拉橋預(yù)拱度的分析。 ①介紹了目前斜拉橋的發(fā)展歷史，詳細(xì)闡述了預(yù)拱度的定義和計(jì)算方式以及各種因素對預(yù)拱度設(shè)置的影響。 ②使用大型有限元分析軟件MIDAS/Civil建立了四川省綿陽市城南新區(qū)一號(hào)橋的有限元模型，通過模型計(jì)算分析恒載、施工階段荷載、車道荷載、人群荷載、橫向風(fēng)荷載、支座沉降等因素在上層人行橋和下層車行橋上分別產(chǎn)生的撓度，通過規(guī)范規(guī)定的荷載組合方式得到人行橋和車行橋的最大預(yù)拱度值。由于上層人行橋材料結(jié)構(gòu)和受力形式的獨(dú)特性導(dǎo)致人行橋的橫向線形變化非常顯著，，根據(jù)有限元軟件計(jì)算結(jié)果，按照類似預(yù)拱度的計(jì)算方式，計(jì)算人行橋的橫向預(yù)偏值。 ③使用MAPLE數(shù)學(xué)計(jì)算軟件，對車行橋的主梁預(yù)拱度進(jìn)行編程運(yùn)算，對MIDAS/Civil中得出的結(jié)果進(jìn)行驗(yàn)算，并且得出一個(gè)可以對特定斜拉橋跨中截面預(yù)拱度進(jìn)行計(jì)算的通用程序。 ④對雙層斜拉橋塔偏、上層人行橋和下層車行橋三者之間的相互影響進(jìn)行了分析并得出結(jié)論。
[Abstract]:The cable-stayed bridge is a composite system bridge composed of tower, cable and beam. Because of the existence of cable, the cable-stayed bridge becomes a high-order statically indeterminate structure. The design of double-deck cable-stayed bridge has a problem of controlling the alignment of double-deck cable-stayed bridge by setting the pre-arch to satisfy the design alignment of the double-deck cable-stayed bridge. How to determine the reasonable completion state of cable-stayed bridge and how to determine the reasonable construction state of cable-stayed bridge are related to the reasonable pre-arch setting scheme. The upper and lower layers of double-deck cable-stayed bridge will have a significant influence on each other, which directly leads to a much more complicated stress and structural deformation of double-deck cable-stayed bridge than that of ordinary single-story cable-stayed bridge. Based on No.1 Bridge in Chengnan New District, Mianyang City, Sichuan Province, this paper analyzes the pre-arch of double-deck cable-stayed bridge. The main contents are as follows: 1. The development history of cable-stayed bridge at present is introduced. The definition and calculation method of pre-arch and the influence of various factors on the setting of pre-arch are described in detail. The finite element model of No. 1 Bridge in Chengnan New District, Mianyang City, Sichuan Province is established by using the large-scale finite element analysis software MIDAS/Civil. The dead load, construction stage load, driveway load, crowd load, transverse wind load are calculated and analyzed by the model. The deflection of the upper footbridge and the lower vehicular bridge caused by bearing settlement and other factors, the maximum pre-arch value of the footbridge and vehicular bridge is obtained by the load combination method stipulated in the code. Due to the unique material structure and force form of the upper footbridge, the lateral alignment of the footbridge is very significant. According to the results of the finite element software, the transverse pre-deflection value of the footbridge is calculated according to the calculation method similar to the pre-arch degree. (3) by using MAPLE mathematical calculation software, the pre-arch degree of the main girder of vehicular bridge is programmed, the results obtained in MIDAS/Civil are checked, and a general program is obtained to calculate the pre-arch degree of the middle section of a particular cable-stayed bridge. 4. The influence of tower deviation, upper pedestrian bridge and lower deck vehicle bridge on the tower deviation of double deck cable-stayed bridge is analyzed and the conclusion is drawn.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U448.27

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本文編號(hào)：2382188