Analysis On Seismic Effect Of The Hydroelectric Power Station Workshop Based On The Static Elastoplasticity

In China, many hydroelectric power stations in progress and planned are located in the region of strong earthquake activity. The problem of seismic performances in hydropower station powerhouse is quite distinct. For a long time, seismic calculation of hydropower station powerhouse structure has been based on the linear and elastic material, which does not consider the obvious nonlinear characteristics of hydraulic reinforced concrete under heavy load. The development of the elastoplasticity earthquake response of hydroelectric power station workshop under the strong earthquake function has the important theory significance and the practical application value.This paper has introduced the research background, the analysis method, the history present situation of the analysis on elastic-plastic earthquake response, and the peculiarity of this problem. Combined with one practical engineering project -a hydropower station powerhouse, a refined finite element model It has been established, and a method of equivalent seismic inertia force has been deduced according to the acceleration distribution of hydropower station powerhouse. Meanwhile, the nonlinear seismic response of powerhouse has been studied based on the finite element program (ANSYS). The structural ductility, stress, plastic zones and fracture distribution in different directions has been gotten, the effect of materials' elasticity and plasticity to the aseismic performance has been studied, and a few useful conclusions were obtained. The main contents and conclusions are as follows:1,Concrete constitutive model, reinforced concrete model, and concrete crack model included inreinforced concrete numerical simulation has been introduced. Mainly the treatment of ANSYS to concrete nonlinear constitutive model and concrete crack has been introduced.2,In order to discover the differences of structural dynamic characteristics between two kinds ofpowerhouses, one hydropower house FEM model has been established, structure dynamic characteristic has been got, distribution coefficient of acceleration has been got, the distribution of structure rigidity and quality has been analyzed and discussed.3,The product of distributive acceleration as the horizontal inertia forces has been given, and correlated formula has been derived. Meanwhile, according to the reduced effect of yield to the structural response, the paper has demonstrated the effectiveness of checking the earthquake-resistant capacity for hydropower house using method of static elastic-plasticity.4,According the response of concrete workshop under horizontal earthquake effect with static nonlinear method, the curve between earthquake coefficient and top point displacement has been built, the structure ductile coefficient has been got, the law of stress' development and the order of crack appearing with the intensity increasing has been analyzed, the lateral resistance capacity and the place apt to crack of concrete structure has been discussed.5,The method of static elastic-plasticity given in this paper, which can embodied structure earthquake-resistant capacity and a few law under effect of earthquake inertia forces, and found weak sections of the structure. Also the difficulty of calculate when using dynamic time history method has been avoided.