【摘要】：水閘是平原地區(qū)常見的水工建筑物，根據(jù)工程實例可知，閘墩部位易出現(xiàn)裂縫的問題，水閘閘墩裂縫的產(chǎn)生主要由于墩體內(nèi)外溫差、混凝土的干縮、自生體積變形和外部約束引起，且各種原因都有一系列的影響因素。該問題長期以來困擾著工程設(shè)計人員，且一直未能得到很好的解決。 閘墩裂縫的出現(xiàn)給水閘工程帶來了多方面不同程度的危害，因此也越來越受到學(xué)術(shù)界的重視。閘墩混凝土在施工期由于水泥水化熱作用，溫度應(yīng)力在應(yīng)力中占有較大比重，是混凝土結(jié)構(gòu)裂縫產(chǎn)生的重要原因之一；且水閘在水工結(jié)構(gòu)工程中屬薄壁結(jié)構(gòu)，與大壩等大體積混凝土相比，薄壁結(jié)構(gòu)混凝土的表面積與體積之比要大得多，水分散發(fā)速度和散發(fā)量相對快和大，干縮變形突出。綜上可知，對閘墩混凝土結(jié)構(gòu)在溫濕度條件下的力學(xué)行為展開一項專門研究是非常有必要的。 本文就水閘中常見的裂縫問題進行了較深入的研究。分析了閘墩混凝土結(jié)構(gòu)在溫濕度條件下的力學(xué)行為及裂縫成因；考慮水閘閘墩混凝土在施工期彈性模量、徐變度隨時間的變化以及外界氣溫變化，，針對施工期間可能發(fā)生的較為不利的寒潮等情況，分別進行了閘墩溫度場和溫度應(yīng)力的全過程耦合仿真分析�？紤]閘墩施工過程中的外界濕度條件，模擬閘墩實際施工過程中的濕度場分布情況，對施工期閘墩干縮應(yīng)力進行全過程仿真分析。利用溫濕耦合方法，實現(xiàn)了對閘墩溫度干縮應(yīng)力的模擬，對溫濕耦合條件下的閘墩結(jié)構(gòu)力學(xué)行為進行深入研究，并根據(jù)模擬結(jié)果對水閘防裂設(shè)計和施工提出了一些建議。
[Abstract]:Sluice gate is a common hydraulic structure in plain area. According to the engineering examples, cracks are easy to appear in the piers. The cracks of sluice piers are mainly caused by the difference in temperature inside and outside of the piers and the shrinkage of concrete. Autogenous volume deformation and external constraints are caused by a series of factors. This problem has been puzzling engineers for a long time, and has not been well solved. The emergence of pier cracks has brought many kinds of hazards to the sluice engineering, so it has been paid more and more attention by academic circles. Due to the hydration heat of cement during the construction period, the temperature stress occupies a large proportion of the stress, which is one of the important reasons for the cracks of concrete structure, and the sluice is a thin-walled structure in the hydraulic structure engineering. Compared with large concrete such as dams, the ratio of surface area to volume of thin-walled concrete is much larger, the velocity and amount of moisture emission are relatively fast and large, and the shrinkage deformation is prominent. In summary, it is necessary to conduct a special study on the mechanical behavior of pier concrete structure under the condition of temperature and humidity. In this paper, the common cracks in the sluice are studied in depth. The mechanical behavior of concrete structure of sluice piers under the condition of temperature and humidity and the causes of cracks are analyzed, and the changes of elastic modulus, creep degree with time and temperature outside of sluice pier concrete during construction are considered. In view of the unfavorable cold wave which may occur during the construction period, the coupled simulation of the temperature field and the temperature stress of the pier is carried out respectively. Considering the external humidity conditions during the construction of the pier and simulating the distribution of the humidity field during the actual construction of the pier, the dry shrinkage stress of the pier during the construction period is simulated and analyzed. By using the coupled method of temperature and humidity, the dry shrinkage stress of the pier is simulated, the mechanical behavior of the pier structure under the coupled temperature and humidity conditions is deeply studied, and some suggestions for the design and construction of the sluice crack prevention are put forward according to the simulation results.
【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】：TV662.2;TV312

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