Simulation Analysis On Thermal Stress Of Powerhouse Monolith Placing With Sequence Construction Method

Hydropower plant is large volume concrete structure, and the structure is complex. During the construction process, in order to reduce the block size and increase the heat pouring area, the method of construction often uses delaminating and blocking and sequence placement. The delaminating and blocking pouring method is helpful to reduce the maximum temperature and the temperature difference between inside and outside, while reducing the constraints. While simulating the temperature-controlled, because of using the sequence placement pouring method and the complex structure, it is widespread to heavy treatment workload before and after the pouring, increased input and output data storage capacity and workload caused by old and new data transmission problems, bandwidth degradation caused by the discontinuous node. The construction method of sequence placement pouring, also creates a large number of problems about old and new concrete combination in three directions, and have a certain impact on the temperature and stress of the dam.In this paper, the finite element model is established by Ansys software and it is posed to use the Fortran temperature control simulation program to calculation the temperature field and thermal stress, then use the Surfer software to carry the post-processing, thus making simulation calculation of any complex structure true.The method mentioned above was used to make an Simulation Analysis of Temperature Field and Thermal Stress for river power station dam and simulate concrete placement process of dam taking in to consideration of temperature variation of environment, interior hydrothermal activity, effect of cooling water pipe, connection of new and old concrete, impounding, creep, cubic self-deformation, and so on. Simulation of temperature stress for river power station concrete sequence placing was completed and a study of characteristics and variation regularity for Temperature Field and Thermal Stress conducted, which is of considerable referential importance in choosing optimized temperature control measures to reduce dam Thermal Stress.