For sluice concrete structure is more complex due to constrained by the base effect and upper structures, with the purpose of temperature control, we carry out the simulation analysis of temperature and stress during the construction of pier concrete structure. Taking a sluice project as an example, use the method developed by Thermo finite subspace model simulation procedures, the finite element model of pier structure is built with high precision. The results show that the cracking risk is relatively small and prone to surface cracks for baseplate; during construction period, much more attention should be payed to the high temperature difference between day and night, and to the insulation work at cold and windy weather; the key problem is that the middle pier which faces relatively great cracking risk, and necessary temperature control measures should be adopted.
This paper using three-dimensional non-steady, nonlinear temperature field and creep stress field of simulation theory, establishes a FORTRAN program for simulating the temperature and stress during the construction of inverted siphon, analyzes the temperature and stress changes and distribution of siphon walls, and proposes the scientific and reasonable control measures of temperature and crack in a complex external environment. The results show that the wall tends to cracking due to tensile stress at early age within 1 day to 3 days, and insulation measures should be taken into account.
In view of the problems of complex geological conditions with high underground water level, large permeability coefficient of soil and the presence of large seepage hazard of deep cut canal and deep foundation pit project of South-to-North Water Transfer Project, China, research on seepage characteristics of digging canals under dewatering well is carried out by finite element analysis, and the FORTRAN procedure is programmed. The three-dimensional finite element model of a digging canal is built, and the seepage field of the different conditions of the canal is simulated, the water head distribution, saturation line and leakages are obtained, and the rules and characteristics of steady seepage field under design impervious system are analyzed. The results indicate that the method can exactly determine the key overflow point and saturation line of canal, and well predict seepage field in canal. The results should be of guiding significance to design and construct retaining engineering in deep cut canal and deep foundation pit.
This paper studies the dynamic characteristics of the rectangular ice cover and the related factors using the finite element method. First of all, the finite element model of the ice cover is set up according to the theory of displacement -pressure law which is used to solve the fluid-solid coupling problem, and the constraint conditions of the ice cover are simplified into two ways that are fixed constraint and space simply supported. Secondly it studies the relation between the modes of vibration and the constraints. Again this article analyzes the relation between the thickness of the ice cover and their frequencies. Finally the paper analyzes its natural frequency with different water depths under the action of the fluid-solid coupling.
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