本文選題：箱形連續(xù)梁 + 轉(zhuǎn)體橋��； 參考：《蘭州交通大學(xué)》2017年碩士論文

【摘要】：國(guó)民經(jīng)濟(jì)水平的提高促進(jìn)了交通基礎(chǔ)設(shè)施的飛速發(fā)展,與復(fù)雜交通網(wǎng)息息相關(guān)的橋梁工程也處于開拓創(chuàng)新的階段。隨著科技不斷進(jìn)步,施工工藝也日趨豐富和成熟,作為跨越繁忙既有線路的轉(zhuǎn)體橋在眾多橋型之中有其獨(dú)特的優(yōu)勢(shì),既不影響施工進(jìn)度又保證了施工安全。轉(zhuǎn)體橋應(yīng)用前景廣闊,并且有一定的科研價(jià)值。本文以工程實(shí)例某上跨鐵路(55+100+55)m箱形連續(xù)梁轉(zhuǎn)體橋?yàn)檠芯繉?duì)象,借助Midas Civil和Midas Fea軟件模擬分析轉(zhuǎn)體橋施工監(jiān)控和局部受力情況。根據(jù)本橋?qū)嶋H施工方式,使用Midas Civil對(duì)梁體各施工階段模擬分析,將提取的各階段理論值與現(xiàn)場(chǎng)實(shí)測(cè)值作對(duì)比,分析數(shù)據(jù)并作有效調(diào)整,確保梁體線形和受力在合理范圍之內(nèi)。利用球鉸轉(zhuǎn)動(dòng)法對(duì)轉(zhuǎn)體T構(gòu)進(jìn)行稱重試驗(yàn),分析試驗(yàn)結(jié)果得到摩阻系數(shù)、不平衡力矩、摩阻力矩和偏心距。通過合理配重消除偏心距的不利影響,確保轉(zhuǎn)動(dòng)時(shí)撐腳處于懸空狀態(tài),減小轉(zhuǎn)動(dòng)過程中轉(zhuǎn)動(dòng)設(shè)備的牽引力,保證大橋安全轉(zhuǎn)體。使用Midas Fea對(duì)下承臺(tái)進(jìn)行水化熱模擬分析,分析時(shí)考慮有冷卻管和無(wú)冷卻管兩種工況。綁扎下承臺(tái)鋼筋骨架時(shí)在中心處埋設(shè)溫度傳感器,記錄下承臺(tái)混凝土澆筑后14天內(nèi)中心處溫度值。將下承臺(tái)中心處溫度理論值與實(shí)測(cè)值比較,監(jiān)控下承臺(tái)溫度場(chǎng)變化。使用Midas Fea對(duì)轉(zhuǎn)動(dòng)體系模擬分析,求解球鉸接觸面豎向位移和豎向壓應(yīng)力并與理論值作比較,驗(yàn)證理論計(jì)算的正確性和接觸面豎向壓應(yīng)力分布形式;對(duì)比分析不同梁體重心偏移值對(duì)球鉸、下承臺(tái)豎向位移、球鉸順橋向水平壓應(yīng)力和球鉸豎向壓應(yīng)力的影響以及本橋重心偏移值的安全范圍;分析上承臺(tái)中預(yù)應(yīng)力鋼束是否能夠減小上下承臺(tái)和球鉸豎向壓應(yīng)力最大值,使轉(zhuǎn)動(dòng)體系更加安全;樁基以距離轉(zhuǎn)動(dòng)中心距離的不同分組,分析各組樁基受力大小和每組分配比例,得出樁基受力分布形式,為此類問題作設(shè)計(jì)參考。
[Abstract]:The improvement of the national economic level has promoted the rapid development of the traffic infrastructure. The bridge engineering which is closely related to the complex traffic network is also in the stage of innovation and innovation. With the continuous progress of science and technology, the construction technology is becoming more and more rich and mature. As a transition bridge across the busy and existing lines, it has its unique advantages in many bridges. The construction progress has been ensured and the construction safety is ensured. The application prospect of the rotating bridge is broad and has a certain value of scientific research. In this paper, a project example of a 55+100+55 m box type continuous girder is taken as the research object, and the construction monitoring and local stress conditions of the rotating bridge are simulated and analyzed with the aid of Midas Civil and Midas Fea software. Construction mode, using Midas Civil to simulate the construction phase of the beam body, compare the theoretical values of each stage with the field measured values, analyze the data and make effective adjustment to ensure that the beam shape and force are within a reasonable range. Using the ball hinge rotation method to carry on the weighing test of the rotating T structure, and analyze the test results to get the friction coefficient, Balance moment, friction torque and eccentricity. Through reasonable counterweight to eliminate the adverse effect of eccentricity, ensure that the leg is in a suspended state during rotation, reduce the traction force of the rotating equipment in the process of rotation, and ensure the safe rotating body of the bridge. Midas Fea is used to simulate the hydration heat of the lower cap, and the cooling pipe and the non cooling tube are considered in the analysis, two The temperature sensor is embedded at the center of the reinforced skeleton of the bearing platform to record the temperature value at the center of the center 14 days after the concrete pouring under the cap of the bearing platform. The temperature field of the cap at the lower cap center is compared with the measured value to monitor the change of the temperature field under the bearing platform. The vertical displacement of the contact surface of the ball hinge is solved by using Midas Fea. The vertical compressive stress is compared with the theoretical value to verify the correctness of the theoretical calculation and the distribution of vertical pressure stress on the contact surface, and to compare and analyze the effect of the deviation of the center of gravity of different beams on the spherical hinge, the vertical displacement of the lower cap, the horizontal pressure stress and the vertical pressure stress of the ball hinge, and the safety range of the offset value of the center of gravity of the bridge. Whether the prestressed steel beam in the platform can reduce the maximum vertical pressure stress of the upper and lower caps and the ball hinges, make the system more safe. The pile foundation is divided into different groups of distance from the center of rotation. The force size of pile foundation and the proportion of each group are analyzed, and the distribution form of pile foundation is obtained, which can be used as a reference for this kind of design.

【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U445.4

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