本文選題：索塔承臺 + 夏季施工��； 參考：《天津大學(xué)》2014年碩士論文

【摘要】：目前懸索橋和斜拉橋得到了廣泛應(yīng)用，其索塔承臺一般尺寸較大，，屬于大體積混凝土結(jié)構(gòu)。大體積混凝土承臺在施工期容易出現(xiàn)裂縫，在其內(nèi)部布置冷卻水管是工程常用的溫控防裂措施之一。本文以某特大懸索橋的索塔承臺為例，對其夏季施工的溫度場和溫度應(yīng)力場進(jìn)行分析，探討其溫控防裂的措施。 首先利用ANSYS有限元分析軟件模擬索塔承臺的分層澆筑過程，對其在水管冷卻作用下的溫度場和應(yīng)力場進(jìn)行瞬態(tài)分析，并與天然冷卻狀態(tài)下承臺的溫度場和應(yīng)力場進(jìn)行對比；然后重點(diǎn)分析了采用水管冷卻措施時(shí)水管間距、水管入口水溫、通水速率、開始通水時(shí)間、管材以及管徑對承臺的溫度場和應(yīng)力場分布的影響；最后分析探討了混凝土澆筑層厚度、混凝土的澆筑溫度和表面遮陽、層間澆筑間隔三種因素對承臺的溫度場和應(yīng)力場的影響規(guī)律，并在此基礎(chǔ)上提出工程實(shí)例的最優(yōu)方案。 研究表明，冷卻水管對承臺的溫控防裂效果顯著，其中冷卻水管間距和開始通水時(shí)間對承臺的溫度場和應(yīng)力場影響比較明顯。降低混凝土的澆筑溫度同時(shí)采用表面遮陽能得到比較好的溫控防裂效果。
[Abstract]:At present, suspension bridges and cable-stayed bridges have been widely used, and their tower caps are generally large in size and belong to large volume concrete structures. Large volume concrete caps are prone to cracks in the construction period, and cooling water pipes in its interior are one of the commonly used measures for temperature control and crack prevention. The temperature field and temperature stress field of summer construction are analyzed, and the measures of temperature control and crack prevention are discussed.
First, the ANSYS finite element analysis software is used to simulate the layered casting process of the tower cap, the transient analysis of the temperature field and stress field under the water pipe cooling is carried out, and the temperature field and stress field of the cap are compared with the natural cooling state, and then the water pipe spacing and the water pipe into the mouth water are analyzed. The influence of temperature, water rate, water time, pipe and pipe diameter on the temperature field and stress field distribution of the bearing platform; finally, the effects of three factors on the temperature field and the stress field of the bearing platform are discussed, and on this basis, the effect of the concrete pouring layer thickness, the concrete pouring temperature and the surface sun shading, the interlayer pouring interval are discussed. The optimal scheme of the course case.
The research shows that the cooling water pipe has a remarkable effect on the temperature control of the cap, in which the cooling water pipe spacing and the beginning of the water time have a more obvious effect on the temperature field and the stress field of the platform.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U445.57

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