本文關鍵詞： 多跨連續(xù)梁橋 合攏順序 懸臂段 齡期差異　出處：《中南大學》2014年碩士論文　論文類型：學位論文

【摘要】：摘要：隨著我國交通建設的迅猛發(fā)展,多跨連續(xù)梁橋得到了很大的發(fā)展,隨著多跨連續(xù)梁橋跨數越來越多,跨度越來越大,合攏問題的研究也越來越多,本文結合衡陽耒河某多跨連續(xù)梁橋,并結合施工監(jiān)控數據,來分析合攏順序,主要工作和成果如下： 1.查閱了大量的有關多跨連續(xù)梁橋的合攏順序資料,對多跨連續(xù)梁橋的發(fā)展情況以及施工特點、合攏工序進行了大量的研究,比較了施工監(jiān)控實測數據與MIDAS有限元軟件計算的理論數據,總結了國內多跨連續(xù)梁橋的合攏工序。 2.運用大型空間有限元軟件MIDAS分析了六跨連續(xù)梁橋的七種施工合攏順序,比較各方案的內力、撓度、應力,得出了較優(yōu)的施工合攏順序。 3.分析了四跨連續(xù)梁橋在中墩施工延期后的施工合攏順序,并比較了中墩延后施工情況下的四種合攏順序的內力、撓度、應力。結合分析各工況的下的內力、撓度、應力,可以得出在實際施工過程中我們應該盡量避免產生相鄰懸臂段出現齡期差異,當實際施工條件或者其它因素影響而不能實現所有懸臂段同時施工時,對于本章所研究的四跨連續(xù)梁橋來說,應盡可能在中墩施工前將邊跨合攏這樣不僅可以改善懸臂段的撓度也可以增加其穩(wěn)定性以及成橋后橋梁的內力特性。 4.對于本文研究的四跨連續(xù)梁橋的施工合攏情況,當無法避免中墩及懸臂段施工延后時,可以先合攏邊跨等中墩及懸臂段施工完成后再進行中跨合攏,此方法施工時邊墩右側懸臂段撓度和應力由于邊跨的合攏,撓度和應力較不優(yōu)先合攏邊跨合攏段時有所增大,本文提出邊跨合攏完成后,提前加載混凝土濕重以及掛籃荷載至懸臂段截面,此時施工階段撓度和應力情況有明顯的改善。
[Abstract]:Absrtact: with the rapid development of traffic construction in our country, multi-span continuous beam bridge has been greatly developed, with the number of multi-span continuous beam bridge more and more, the span is becoming larger and larger, and the research on closure problem is becoming more and more. Combined with a multi-span continuous beam bridge in Hengyang Leihe River and construction monitoring data, this paper analyzes the closure sequence. The main work and results are as follows: 1. A great deal of information about the closure sequence of multi-span continuous beam bridge is consulted. The development and construction characteristics of multi-span continuous beam bridge are studied. This paper compares the measured data of construction monitoring with the theoretical data of MIDAS finite element software, and summarizes the closing procedure of multi-span continuous beam bridge in China. 2. By using the large spatial finite element software MIDAS, seven kinds of construction closure sequences of six-span continuous beam bridge are analyzed, and the internal force, deflection and stress of each scheme are compared, and a better construction closure sequence is obtained. 3. The construction closure sequence of four-span continuous girder bridge after delayed construction of middle pier is analyzed, and the internal force and deflection of the four closure sequence are compared under the condition of delayed construction of middle pier. Stress. Combined with the analysis of the internal force, deflection, stress under each working condition, we can draw the conclusion that in the actual construction process, we should avoid the age difference of adjacent cantilever segment as far as possible. When the actual construction conditions or other factors can not achieve all the cantilever construction at the same time, for the four-span continuous beam bridge studied in this chapter. The side span should be closed as far as possible before the construction of the middle pier so as to improve not only the deflection of the cantilever but also the stability of the cantilever and the internal force characteristics of the bridge after completion. 4. For the construction closure of the four-span continuous beam bridge studied in this paper, when the construction of the middle pier and the cantilever section cannot be avoided, the middle pier and cantilever section can be closed after the completion of the construction of the same middle pier and cantilever section. The deflection and stress of the cantilever section on the right side of the side pier are increased in this method because of the closure of the side span. When the wet weight of concrete and hanging basket load to the section of cantilever section are loaded in advance, the deflection and stress in construction stage are obviously improved.
【學位授予單位】：中南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U445;U448.215

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本文編號：1470747