Research On Seismic Response Index Of Reinforced Concrete Frame Structure

Frequent earthquakes have caused buildings to collapse,which seriously threatens the safety of human life and property.The key to ensuring building safety is structural earthquake resistance.At present,the reinforced concrete frame structure is still widely used.Therefore,the seismic research work of the frame structure can not be ignored,and the structural seismic response is the most basic problem.Therefore,the influence law of various influencing factors on the seismic response of the frame structure is studied to strengthen the framework.The seismic target of the structure improves the overall seismic capacity of the frame structure and plays a very important role in grasping the seismic performance of the frame structure.In this paper,the reinforced concrete frame structure is taken as the object,and the seismic response of the structure is analyzed and evaluated from the multi-angle and multi-faceted aspects of structural dynamic factors,material constitutive relations and structural geometric factors.The main research work in the following aspects:(1)The structural seismic design concept and the development of seismic design methods are introduced.The research status,research methods and existing problems of the seismic response of the frame structure are expounded,and the necessity of studying the seismic response of the frame structure is emphasized.(2)The difference between the two modes of vibration mode participation and the vibration mode contribution coefficient is analyzed.The mechanical equivalence relations of the two modes on the base shear force level are derived.Based on this,the displacement based on the displacement is introduced.And the selection method of the seismic vibration mode order of the double index of the base shear force.(3)Study the influence of structural dynamic factors on the seismic response index of reinforced concrete frame structure.Based on the structural design and calculation of reinforcement,the SAP2000 finite element numerical model(5 layers,8 layers,11layers)is established according to China’s norms.Static thrust analysis method,vibration mode decomposition method,dynamic time history analysis method,etc.,comparative analysis of structural period,shape shape,number of modes,variation ofseismic response of structures,calculation accuracy and different selection methods of vibration modes,The feasibility of selecting the mode selection method based on the double index of displacement and base shear force is verified.(4)Study the influence of structural material constitutive relationship on the seismic response index of reinforced concrete frame structure.Compare and analyze the difference between ordinary concrete constitutive relationship and recycled concrete constitutive relationship,and based on China’s code "Concrete Structure Design Code"(GB50010-2010)The structural constitutive relationship of concrete in and the constitutive relationship of Xiaojianzhuang recycled concrete are used to establish the numerical model of the frame structure.The Pushover analysis method and dynamic time history analysis method are the main lines.The time-history analysis results analyzed the seismic response indexes such as apex displacement,base shear force,and inter-layer displacement angle of different concrete constitutive relations.(5)Study the influence of structural geometric factors on the seismic response index of reinforced concrete frame structures.Based on the structural span,beam-column reinforcement ratio,beam-column section area and other variables,based on Pushover analysis method and dynamic time history analysis method,the structural apex displacement,base shear force and inter-layer displacement angle are used as seismic response indicators for seismic response.Performance analysis reveals the influence of these factors on the seismic performance of reinforced concrete frame structures.