| With the development of urbanization in our country,giving great impetus to railway,highway,bridge,subway’s building,the large volume concrete construction has been widespread utilization.The problems of crack from concrete hydration heat come. In Bridge Engineering,to make sure the safe and durability of construction,it is so important to study on the temperature distribution of the large volume concrete of the bridge.At first,this thesis is to explain the harm,the sort and the cause of cracks and to explain the current measures of avoiding the massive concrete having temperature cracks in the material aspecte,the construction aspect and the conserve of the concrete.Then based on the S004# cap and the top beam of tower(column) of the N4# tower from the Yangtze River Highway-Railway Cable-stayed bridge in Gong An.Monitoring the temperature of the large volume concrete.Using Midas building up finite element model to simulate the temperature distribution. Analyzing the different of theory and practice,Studying on large volume concrete temperature distribution.The temperature distribution in the cap and in the top beam of tower(column) are different,mainly beacause of the influence by the cooling water pipe and the shape of the section,under the influence of the cooling water pipe,not only the temperature in the cap is down,but the temperature distribution in the cap is changed.On the basis of those research,to study the influence on the cap’s heat of hydration in the case of different water temperature,different size,different distance of the cooling water pipe,different varieties and volume of cement,different environments’temperature,different concret’s temperature into the mold and different boundary conditions.The above researchs show that,it can shrink the stress of temperature and reduce the chance of the cracks to come by suitbable methods of temperature control in the cap and in the top beam of tower(column) and benefit the construction safety. |
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