本文選題：槽形梁　切入點：落架順序　出處：《蘭州交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：本文針對某高速鐵路預(yù)應(yīng)力混凝土槽形連續(xù)梁橋在施工過程中遇到的落架施工順序選擇的問題進(jìn)行了研究。施工現(xiàn)場存在環(huán)境復(fù)雜、施工控制不到位、施工管理不當(dāng)?shù)纫蛩?無法做到各跨同步卸落。本文通過分析槽形梁因為非同步卸落支架可能出現(xiàn)的各種工況下的受力情況,確定了一種滿足施工環(huán)境限制的合理落架方案。主要工作如下:(1)探討了槽形連續(xù)梁橋的常用施工方法,并詳細(xì)探討了滿堂支架法施工槽形連續(xù)梁橋的落架問題。(2)分析了槽形梁橋在落架過程中可能出現(xiàn)的問題。通過分析得出了縱橋向和橫橋向非同步卸落時槽形梁的受力情況,以及可能出現(xiàn)的不利于結(jié)構(gòu)安全的工況。(3)利用Midas Civil建立落架過程分析的有限元模型。本文按照順橋向和橫橋向的不同落架順序區(qū)分出8種工況,使用梁板結(jié)合單元模擬槽形梁,節(jié)點彈性支座模擬支架體系,并通過節(jié)點彈性支座的鈍化與激活來模擬支架的拆除情況。(4)結(jié)合計算結(jié)果分析了各種落架順序的合理性,確定了最優(yōu)的落架方案并提出了槽形梁落架過程中應(yīng)該注意的事項。根據(jù)計算數(shù)據(jù)和分析得到了如下結(jié)論:(1)全橋各跨按照撓度比例均勻落架對槽形梁的受力最為有利,但當(dāng)施工環(huán)境不允許時,中跨先落架,兩邊跨隨后同時落架的落架方案為最優(yōu)選擇。(2)縱橋向的不均勻落架均不會造成梁的主拉應(yīng)力超過規(guī)范值。但當(dāng)中跨和某一邊跨均已落架,而另一邊跨未落架時,在已落架的兩跨間中支座處截面上緣會出現(xiàn)較大的拉應(yīng)力。這種工況在施工中應(yīng)盡量避免出現(xiàn)。(3)對于梁底較寬的槽形梁來說,橫向的不均勻落架會使槽形梁的底板受到較大的拉應(yīng)力,故橫向必須采取同步落架的方式。
[Abstract]:In this paper, the problems of selecting the construction sequence of the falling frame in the construction process of a prestressed concrete continuous girder bridge of a high speed railway are studied. There are some factors in the construction site, such as complex environment, inadequate construction control, improper construction management, and so on. In this paper, by analyzing the force situation of the slot beam under various working conditions which may appear in the asynchronous unloading support, A reasonable scheme of falling frame to meet the limit of construction environment is determined. The main work is as follows: 1) the common construction methods of continuous girder bridge with groove shape are discussed. This paper also discusses in detail the problem of falling frame in the construction of continuous beam bridge with full support method. (2) the problems that may occur in the process of falling frame of slot beam bridge are analyzed. Through the analysis, the force situation of slot beam during asynchronous unloading of longitudinal bridge and transverse bridge is obtained. Midas Civil is used to establish the finite element model for the analysis of the falling frame process. In this paper, according to the different descending order of the forward bridge and the transverse bridge, eight kinds of working conditions are distinguished, and the beam-plate combination element is used to simulate the slot beam. The joint elastic support simulates the support system, and through the passivation and activation of the node elastic support to simulate the removal of the support. The optimal scheme of falling frame is determined and the matters needing attention in the process of falling frame of slot beam are put forward. According to the calculation data and analysis, the following conclusion is drawn: 1) the stress of the slot beam is most favorable when the span of the whole bridge falls evenly according to the deflection ratio. However, when the construction environment does not permit, the first falling frame of the middle span, and the optimal scheme of dropping the frame at the same time between the two spans at the same time, will not cause the main tensile stress of the beam to exceed the standard value. However, the main tensile stress of the beam will not exceed the standard value. However, both the middle span and one side span have already fallen off the frame. However, when the other side of the frame does not fall, the upper edge of the cross section of the middle support between the two spans of the already fallen frame will have a large tensile stress. In this case, we should try to avoid the appearance of .f3 in the construction) for the beam with a wider bottom, The transverse uneven falling frame will make the bottom plate of the slot beam subjected to greater tensile stress, so the horizontal must adopt the mode of synchronous drop frame.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U445.4

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