Shaking Table Test And Numerical Simulation Of Shielded Powerhouse In Non-bedrock Site

In recent years,my country has successively developed technologies such as "HPR1000","CAP1400",and "ACP100",which has enabled my country’s nuclear power technology from the second generation to three generations,which has increased by 100 times the safety level,and we have the independent intellectual property rights of the third generation of non-energy nuclear power.The non-energetic safety gravity cooling water tank is located at the top of the shielding plant.It is an important part of the third-generation pressure pile nuclear power plant.which is an important part of the third-generation pressurized water reactor nuclear power plant,with its high location and large mass,and the interaction between the water body in the tank and the tank forms a fluid-solid coupling effect,which affects the seismic response of the shielding plant and needs to be considered in the seismic study.In order to optimize and adjust the energy structure,fully implement the low-carbon development strategy,and expand clean energy,the scale of nuclear power plants will continue to expand,when the site selection increases,the candidate bedrock sites are increasingly scarce,and nuclear power plants are bound to broaden the design foundation from bedrock sites to non-bedrock sites,and the foundation soil of non-bedrock sites has a strong amplification effect on ground vibration,and the soft ground foundation under the effect of strong earthquake may lead to the excellence of the foundation soil cycle and the self-oscillation cycle of the shielding plant with resonance,so that the shielding plant structure with a long self-oscillation cycle is severely damaged,therefore,the study of soil-structure interaction in non-bedrock sites is also imperative.At present,most of the studies only consider one of the fluid-solid coupling effect and soil-structure interaction,and there are fewer analyses that consider both of these factors,and there is no unified conclusion whether the fluid-solid coupling effect can attenuate the structural seismic response,and some related numerical simulation analysis also lacks experimental comparison.Based on the above background,this thesis takes a new type of pressurized water reactor nuclear power plant shielding plant as the research object,and designs two simplified models of shielding plant with and without water at 1/50 scale by using similar theory and reference shaking table parameters,and calculates the structural dimensions of the simplified models by using the stiffness equivalence principle,A series of shaker tests were carried out by selecting an El Centro natural ground motion and an artificial ground motion fitted by AP1000,and a simplified model seismic response considering fluid-structure interaction effects and soilstructure interaction was studied.,and the dynamic characteristics,acceleration,strain,dynamic water pressure and test phenomena of the two models were dynamically analyzed.For the shaking table test,a numerical model was established using ABAQUS finite element software,Simplification of fluid-structure interaction and soil-structure interaction;The numerical simulation results were analyzed,and the numerical simulation data were compared and analyzed with the experimental data.The results show that the existence of model soil leads to the reduction of system frequency,and it is necessary to pay attention to the influence of non-bedrock sites on the dynamic characteristics of nuclear power plants;the simplified model designed by the stiffness equivalence principle using similar theory in this thesis can be used for the study of the seismic response law of shielded plants;the presence of water and water shaking can reduce the seismic response of model structures as verified by shaking table tests and numerical simulations,the damping effect is affected by structural dynamic characteristics,peak acceleration and the spectral characteristics of the input ground vibrations;the simplified model of fluid-solid coupling effect and viscoelastic boundary can be used for seismic response analysis of shielding plant at non-bedrock sites,and the numerical simulation results are reasonable and feasible.