大體積混凝土澆筑過程熱應(yīng)力分析和參數(shù)化模板開發(fā)
[Abstract]:With the rapid development of the construction industry, the scale of concrete structure is becoming more and more complicated and large-scale. The influence of thermal stress caused by cement hydration heat on the structure has been paid more and more attention to in the early pouring process of mass concrete. This kind of thermal stress can lead to concrete internal and surface cracks, seriously affect the strength of the structure, resulting in hidden safety problems. Therefore, it is of great engineering significance to study the early temperature stress field of mass concrete. The thermodynamic parameters of temperature field and thermal stress field caused by hydration heat of mass concrete are very complicated. Many of the models are based on empirical formulas, such as cement hydration heat model, early concrete elastic modulus variation model, etc. In order to solve these problems, the temperature field and stress field of mass concrete in the early stage are studied in this paper, and the "foundation of blast furnace in Yinshan 3#3200m3 blast furnace engineering of Laigang" is simulated and analyzed by finite element software MSC.Marc. In this paper, the temperature field of mass concrete is analyzed by finite element method. The finite element model of the concrete pouring process is established, the creep of the material is described and determined, the heat rate of hydration and other heat dissipation and constraint boundary conditions are determined, and the temperature field distribution during the construction period and 70 days after the construction is calculated. The construction process of concrete blast furnace foundation is simulated dynamically, and the model and boundary conditions are improved step by comparing the simulated temperature of the measured temperature points with the measured temperature on the spot, and the results are analyzed. Based on the results of the temperature field, the stress field of the model is analyzed by finite element method. In this paper, the time-dependent elastic modulus in concrete pouring process is studied by means of the thermo-mechanical coupling simulation method, and the temperature simulation results obtained are compared with the actual measurement data through the comparison of the obtained temperature simulation results and the actual measurement data. The correctness of the method is verified. Combined with the finite element results of stress field obtained by simulation, the causes and control methods of temperature cracks in concrete blast furnace foundation structure are expounded. Based on the interface between Marc and Viusal Basic, the parameterized modeling of typical concrete foundation pouring simulation process is also carried out in this paper. A user-oriented executable program is generated, and a fast finite element simulation modeling method is provided. It brings convenience to engineering practice.
【學位授予單位】:北京交通大學
【學位級別】:碩士
【學位授予年份】:2013
【分類號】:TU755
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