In this paper, we conduct research on the experimental and the testing mode of the highway bridge load capacity based on the static analysis. Modal parameters is refers to the bridge structure calculation of modal frequencies and mode shapes and modal parameters such as the quality. Modal parameters method and other methods differed from the load transverse distribution influence line is composed of the modal parameters are calculated out as every piece of beam deflection; Secondly, according to the modal flexibility from the deformation of beams in the mid-span position of value, according to the deformation value and beam on the number of slices, calculation, draw the influence line of transverse distribution of load. Under this guidance, we enhance the traditional methodologies with the static analysis that will achieve better performance.

The water passageway structure of pumping station is both mass concrete structure and complicated structure. Cracks always appear in these areas during construction period. It will shorten the building life, and endanger the safety of pumping station. Three dimensional finite element method is adopted to simulate the temperature field and stress field of pump station in construction. The considering loads include gravity, temperature, autogenous volume deformation, and creep. The temperature and the first principle stress duration curves of easily cracking area are analyzed in different cases. After optimization of different temperature control measure, the tensile stress of different areas in early age or later age can be controlled lower than tension strength, and the cracking prevention safety factor can be raised. It is found that pipe cooling, surface insulation, pouring intermission, structure constrains can change the tensile stress obviously for pumping station. The influence of these factors is separately concluded.

No abstract

Cracking is a common phenomenon in long concrete structure. But for hydraulic structure it is not permitted because crack will cause heavily seepage and other disaster. Temperature control is an important way to prevent cracking. As for a long deck which has to be constructed in summer, temperature control and crack prevention is a hard work. With the aid of finite element method for temperature field and stress field simulation, research is carried out for a long deck of a pump station. Different measures, such as pipe cooling, surface preservation and pouring temperature control, are tried to control the temperature and stress. The simulation results of different measures composite schemes are analyzed. At last the optimized measures are proposed and its application at site shows it’s successful.