Probabilistic Seismic Performance Analysis Of RC Frame Structure Considering Soil-structure Interaction

In recent years,the frequent occurrence of earthquakes around the world is one of the major natural disasters faced by mankind.Countries in the world are deeply affected by earthquake disasters.So prevent earthquake disasters and improve the seismic performance of buildings,the seismic design and structural optimization of building structures have been the focus of scholars from all over the world.The search and improvement of structural earthquake failure modes,optimization and control,and the improvement of the overall seismic capacity of the structure are also central issues in the field of seismic work.Under the action of an earthquake,ground motion can be transmitted to the structure through the soil,causing the structure to vibrate,and in the meantime the inertial force generated by the structure reacts to the foundation soil,that is,the Soil-Structure Interaction(SSI).As a more economical and reasonable design method for seismic research,the soil-structure interaction reinforced concrete frame structure based on probabilistic seismic performance analysis can describe the internal force and deformation probability characteristics of the superstructure and foundation through reasonable consideration of the uncertainty of the structure parameters.Reflect the actual working status of the system.Therefore,the analysis of the probabilistic seismic performance of the structure considering the soil-structure interaction is of great significance to the seismic design and design specification of the structure.The essay analyzes the seismic response and seismic performance of a six-story,three-span reinforced concrete frame structure considering the soil-structure interaction,which mainly includes the following tasks:1.Taking the 6-story and 3-span reinforced concrete frame structure as the research object,based on the Open Sees finite element platform,a refined RC frame structure finite element model considering material damage was established and combined with the clay multi-yield surface based on the plane four-node element,soil-structure interaction finite element model was obtained.2.Based on the nonlinear Pushover analysis to explore the failure mode of the structure considering the soil-structure interaction.Considering the material parameters of the soilstructure interaction system,the effects of material nonlinearity,geometric nonlinearity and soil-structure interaction on the structure failure mode and structural response are studied,and the response of the foundation fixed structure is compared.This model can be used not only analyze the influence of the foundation soil on the structure when considering the soil-structure interaction,but also analyze the response of the pile and the effect of the structure on the foundation soil.The research on the seismic response of soil-structure interaction structure not only deepens the influence of foundation soil on the structure,but also provides a reference for the optimization of the seismic design of this type of structure.3.Based on the nonlinear dynamic time history analysis method,the effects of geometric nonlinearity,seismic randomness,structural component parameter uncertainty and ground motion intensity on the seismic performance of soil-structure interaction structures are comprehensively considered.Using PGA(peak ground acceleration)as the input intensity of ground motions,the seismic performance of soil-structure interaction structures under different influencing factors was compared and analyzed,and the correlation between the seismic responses of soil-structure interaction structures was analyzed.4.Based on the time-history analysis method of the main aftershocks,the seismic response of the fixed foundation structure and the soil-structure interaction structure under the action of the main aftershocks was compared,the influence of the aftershocks on the structure response was summarized,and seismic performance under the action of main aftershocks was analyzed.