發(fā)布時間：2018-11-26 17:16

【摘要】：隨著橋梁施工技術(shù)的不斷發(fā)展,橋梁施工工藝也在不斷的更新。頂推法施工對橋位處的交通不會產(chǎn)生太大的影響;和其他施工方式相比需要的施工設(shè)備相對而言少;有利于生產(chǎn)組織,可以縮短施工工期�；�于這些優(yōu)點頂推法施工越來越多的被運用到橋梁架設(shè)中。但是頂推法施工過程中,橋梁整體的體系轉(zhuǎn)換頻繁。隨著頂推作業(yè)的進行結(jié)構(gòu)的坐標,位移以及受力狀態(tài)都在不斷的發(fā)生變化,使得施工過程中結(jié)構(gòu)受力比其他施工方式要復(fù)雜。本文以仙岳路-成功大道立交工程主線橋的頂推施工為背景,主要的工作如下:(1)簡單介紹了頂推方法起源和頂推法施工的構(gòu)造;對頂推的方法和原理進行了總結(jié);詳細說明了其頂推施工監(jiān)控系統(tǒng)的建立。(2)運用大型通用有限元軟件ANSYS對鋼箱梁頂推施工的各個工況逐個建立三維仿真模型,根據(jù)基本工程資料,確定相關(guān)模型參數(shù)、選取合理的單元。對不同的工況進行模擬頂推施工,確定施工過程中需要控制的參量。(3)針對頂推(拖拉)過程導(dǎo)梁從最大懸臂狀態(tài)至跨過成功大道時,導(dǎo)梁從最大負彎矩狀態(tài)變換為最大正彎矩狀態(tài),工字鋼導(dǎo)梁上下翼緣板均有發(fā)生局部失穩(wěn)的現(xiàn)狀,建立了導(dǎo)梁精細化有限元模型,對導(dǎo)梁的截面形式提出了優(yōu)化建議、并對工字鋼導(dǎo)梁上下均設(shè)置了局部加勁肋,頂對過程在導(dǎo)梁關(guān)鍵部位布置了傳感器,理論分析計算結(jié)構(gòu)與現(xiàn)場實測相互應(yīng)證,保證了導(dǎo)梁結(jié)構(gòu)的安全運行。(4)對實際頂推施工中的位移,應(yīng)變進行實測。在對應(yīng)的工況下與有限元模型計算值進行對比,實時調(diào)整模型參量,指導(dǎo)下一個施工工況。(5)針對頂推(拖拉)過程各個支撐滑塊支撐反力不斷變化、且有可能發(fā)生三點支撐的現(xiàn)實情況,通過建立底板、腹板區(qū)域精細化有限元模型仿真分析,得到底板與腹板交接區(qū)域通過滑塊是局部應(yīng)力很大極有可能發(fā)生局部失穩(wěn)的情況,建議對該區(qū)域增設(shè)縱、橫向局部加勁肋,并在改區(qū)域布置了傳感器,頂推(拖拉)過程應(yīng)力傳感器實測數(shù)據(jù)應(yīng)證了局部精細有限元仿真結(jié)果的正確性,所提出的增設(shè)局部加勁肋的建議保證了鋼箱梁底板通過滑塊時的安全,避免了鋼箱梁局部失穩(wěn)損傷事故的發(fā)生,是鋼箱梁順利實現(xiàn)頂推(拖拉)的重要技術(shù)保障措施。(6)頂推(拖拉)全過程不僅對鋼箱梁總體位移進行檢測、而且對報告支撐墩在內(nèi)的附屬結(jié)構(gòu)進行全程安全性監(jiān)測,實施對有限元計算結(jié)果于施工實測結(jié)果進行對比分析,一旦發(fā)生較大偏差立即分析原因,從而保證了整個橋梁頂推施工的安全。本文研究方法與所得結(jié)論可為同類橋梁施工提供參考。
[Abstract]:With the continuous development of bridge construction technology, bridge construction technology is constantly updated. Compared with other construction methods, the construction equipment needs less, is advantageous to the production organization, and can shorten the construction period. Based on these advantages, more and more construction methods are used in bridge erection. However, in the construction process of the jacking method, the system transformation of the whole bridge is frequent. With the continuous change of the coordinate displacement and stress state of the structure during the construction process the structural force is more complicated than other construction methods. The main work of this paper is as follows: (1) the origin of the thrusting method and the construction of the jacking method are briefly introduced, and the methods and principles of the thrusting are summarized. The establishment of monitoring system for jacking construction is explained in detail. (2) the 3D simulation model of steel box girder jacking construction is established one by using the large-scale universal finite element software ANSYS, and the relevant model parameters are determined according to the basic engineering data. Select reasonable units. The parameters to be controlled in the construction process are determined by simulating the jacking construction under different working conditions. (3) when the guide beam is in the state of maximum cantilever from the maximum cantilever state to the crossing of the main road of success in the process of pushing (towing), The guide beam is transformed from the maximum negative moment state to the maximum positive moment state, and the local instability occurs in the upper and lower flange plates of the guide beam of I-beam. The finite-element model of the guide beam is established, and the optimization suggestions for the section form of the guide beam are put forward. A local stiffening rib is set up for the I-beam guide beam up and down, and the top pair is arranged in the key part of the guide beam. The theoretical analysis and calculation structure and the field measurement verify each other. The safety operation of the guide beam structure is ensured. (4) the displacement and strain in the actual jacking construction are measured. The model parameters are adjusted in real time to guide the next construction condition. (5) the support reaction force of each support slider is constantly changing in the process of pushing (dragging). And it is possible to have the reality of three-point support. Through the simulation analysis of the finite-element model of the bottom plate and the web region, it is concluded that the local stress of the interface area between the bottom plate and the web through the sliding block is very large and the local instability is likely to occur. It is suggested that longitudinal and lateral local stiffeners should be added to the region, and sensors are arranged in the modified area. The measured data of the stress sensors during the push-pull process should prove the correctness of the local fine finite element simulation results. The suggestion of adding local stiffener ensures the safety of the steel box girder bottom plate when it passes through the slider, and avoids the occurrence of the local instability damage accident of the steel box girder. It is an important technical guarantee measure for the steel box girder to smoothly realize the pushing (towing). (6) the whole process of pushing (towing) not only detects the total displacement of the steel box girder, but also monitors the safety of the auxiliary structure, including the report supporting pier, in the whole process. The results of finite element calculation are compared with the measured results of construction, and the reasons are analyzed immediately once a large deviation occurs, thus ensuring the safety of the whole bridge jacking and pushing construction. The research method and conclusion of this paper can provide reference for the similar bridge construction.
【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】：2015
【分類號】：U445.4

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