【摘要】：近年來(lái)，隨著橋梁建設(shè)規(guī)模的擴(kuò)大，承臺(tái)大體積混凝土的溫度裂縫問題日漸突出。對(duì)于整體澆筑的大體積混凝土，由于水泥水化熱作用，會(huì)產(chǎn)生較大的溫度變化，受到內(nèi)部或外部約束時(shí)，產(chǎn)生較大的溫度應(yīng)力，若超過混凝土的抗拉強(qiáng)度，就會(huì)造成混凝土的開裂，影響其正常使用。因此，有必要對(duì)大體積混凝土溫度場(chǎng)及應(yīng)力場(chǎng)進(jìn)行研究，避免混凝土溫度裂縫的產(chǎn)生。 本文依托福建瑯岐閩江大橋，通過混凝土配合比的選擇、冷卻水管布設(shè)、溫控?cái)?shù)值仿真及現(xiàn)場(chǎng)溫度監(jiān)測(cè)，，對(duì)承臺(tái)大體積混凝土溫控開展了系統(tǒng)研究。主要研究成果如下： （1）基于國(guó)內(nèi)外研究成果，綜述了大體積混凝土產(chǎn)生裂縫的原因及采取的溫控措施；結(jié)合福建瑯岐閩江特大橋工程實(shí)際，闡釋了4#主墩、5#輔墩承臺(tái)技術(shù)標(biāo)準(zhǔn)和施工方案及工藝流程；介紹了混凝土水化熱有限元分析的理論基礎(chǔ)。 （2）依托福建瑯岐閩江特大橋4#墩、5#墩承臺(tái)工程實(shí)際，綜合考慮冷卻水管的布設(shè)、水流及邊界條件、施工工序等因素，對(duì)承臺(tái)大體積混凝土進(jìn)行了溫控?cái)?shù)值仿真，從中選取了可行的優(yōu)化方案。 （3）通過對(duì)承臺(tái)大體積混凝土溫度的現(xiàn)場(chǎng)監(jiān)測(cè)，增加了溫控施工的信息化，為承臺(tái)的保溫防裂養(yǎng)護(hù)提供了科學(xué)依據(jù)；并將所得結(jié)果與數(shù)值模擬結(jié)果進(jìn)行對(duì)比分析，得出數(shù)值模擬與現(xiàn)場(chǎng)實(shí)測(cè)結(jié)果相互驗(yàn)證，以及相關(guān)溫度變化規(guī)律，為溫度裂縫控制提供了理論依據(jù)，具有重要的工程應(yīng)用價(jià)值。
[Abstract]:In recent years, with the expansion of bridge construction scale, the temperature crack problem of pile cap mass concrete is becoming more and more serious. For the mass concrete cast as a whole, due to the heat of hydration of cement, the temperature will change greatly, and when the concrete is restrained internally or externally, it will produce larger temperature stress, if it exceeds the tensile strength of the concrete, Will cause concrete crack, affect its normal use. Therefore, it is necessary to study the temperature field and stress field of mass concrete to avoid the occurrence of temperature cracks. Based on the Luangqi Minjiang River Bridge in Fujian Province, through the selection of concrete mix ratio, the arrangement of cooling water pipes, the numerical simulation of temperature control and the field temperature monitoring, the temperature control of large volume concrete in the cap is studied systematically in this paper. The main research results are as follows: (1) based on the domestic and foreign research results, the causes of the cracks in mass concrete and the temperature control measures taken are summarized, and the actual situation of the Minjiang River Bridge Project in Luangqi, Fujian Province, is also discussed. This paper explains the technical standard, construction scheme and technological process of bearing cap of main pier and auxiliary pier, introduces the theoretical basis of finite element analysis of concrete hydration heat. (2) depending on the pier of Minjiang River Bridge in Luangqi, Fujian Province, the engineering practice of bearing cap of pier is introduced. Considering the layout of cooling water pipe, water flow and boundary condition, construction procedure and other factors, the temperature control numerical simulation of the cap mass concrete is carried out. The feasible optimization scheme is selected. (3) through the field monitoring of the mass concrete temperature of the cap, the informatization of the temperature control construction is added, which provides the scientific basis for the thermal insulation and crack prevention maintenance of the cap; The results obtained are compared with the results of numerical simulation, and the mutual verification between the numerical simulation and the field measurement results, as well as the related temperature variation rules, are obtained, which provides a theoretical basis for the control of temperature cracks and has important engineering application value.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U445.57

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