Analysis On The Stress Of The Substructure Of The Main Bridge Of Huhe River

In recent years, accompanied by the rapid development of China's modernization, Bridge Construction, Design techniques become more sophisticated, Appeared a large number of used with massive concrete structures caps, anchor, and tower; At the same time due to poor thermal conductivity of concrete structures and the surrounding natural environment, at the process of concrete's curing, the hydration heat concrete released, made internal and external temperature of the concrete structure different, formed large temperature gradient, thereby forming a large temperature gradient, the resulting temperature deformation make the structure produce large temperature stress. In bridge construction, often due to inappropriate crack control measures, it resulted that the thermal stress exceeds the tensile strength of concrete, thereby cracking the structure directly affect the safe use of the bridge structure. Therefore, the temperature led to one of the main cracks Pier, it is necessary to combine the characteristics of the bridge itself to study the temperature field and thermal stress of the laws.This paper studies the Huaihe River to the Beijing-Shanghai high-speed railway bridge as the background, based on the field measurement and simulation experiment, studied temperature field and thermal stress development and changes of the Huaihe River Bridge Main Bridge Piers. Through simulating the entire construction project by the finite element software, and comparative analysis of the measured temperature data and simulative temperature, while analyzed temperature and stress field analysis, finally got to the conclusion a general law.The main contents of the paper as follows:(1) based on the results, described the development of mass concrete and application, and describes the main reason for mass concrete cracking and crack control measures, analysis of mass concrete temperature generation mechanism of stress, damage and control methods;(2) have established finite element formulation with Thermal Stress Analysis of Mass Concrete, expounded the finite element simulation calculation principle of the concrete temperature field and stress field analysis;(3) use the finite element software MIDAS to establish the finite element model of Mass Concrete Pier Bridge, made pouring temperature field simulation comparative analysis, studied the development and distribution of the of temperature field and thermal stress field in the Pier changes over time;(4) use finite element software MIDAS to study pier stress at static loads on the Pier under the action of the static load;(5) for the construction, making the effective temperature controlling measures to reduce the temperature difference between inside and outside, and make concrete's temperature changes to be uniformed, so as to achieve the internal temperature of mass concrete stress field of the law more rational to reduce the cracks.