Performance-based Seismic Design Method For Assembled Monolithic Reinforced Concrete Frame Structure

With the development of industrialization of buildings,prefabricated buildings are heavily constructed and used in China.However,the seismic performance of the assembled monolithic frame structure has always been the focus of attention.Performance-based seismic design as an advanced seismic design concept has been recognized by most countries in the world.In this paper,the assembled monolithic reinforced concrete frame structure is taken as the object,and the seismic performance analysis of the structural model is carried out by using the performance-based seismic design method.The seismic performance analysis and evaluation of assembled monolithic reinforced concrete frame structures under multi-level earthquakes,including extremely rare earthquakes,have theoretical significance and engineering value.The work and the results achieved in this paper mainly include:(1)Using SAP2000 software to establish analytical models,through the introduction of the structural constitutive model and the processing of the nodes,three assembled monolithic reinforced concrete frame structures with different heights were established.(2)Explain the basic theory and basic assumptions of Pushover analysis method,and explore the concept definition of different loading modes and the applicable structural system.The static elastoplastic analysis of the structural model is carried out by using the inverted triangle lateral loading mode to obtain the Pushover curve of the structure.The loading mode has less error for the structural calculation results.(3)The relationship between structural multi-degree-of-freedom system and single-degree-of-freedom system is studied,and the Pushover curve is linearized to determine the yield displacement,the ultimate displacement,the ductility coefficient of the structure and the development of the plastic hinge of the structure under different elastoplastic states.The behavioral response and weak links of the assembled monolithic reinforced concrete frame structure under earthquake action are studied.(4)The multi-yield displacement is used to control the displacement of the structure.The overall variation trend of the apex displacement angle and the maximum interlayer displacement angle of the three structural models approximates a straight line.And the maximum interlayer displacement angle is larger than the vertex displacement angle under the same displacement control index.(5)Explain the basic principle of elastoplastic dynamic time history analysis,study the principle of wave selection of ground motion,and the elastoplastic dynamic time history analysis of structural model is carried out by using appropriate ground motions,and the seismic performance of the structure was evaluated under the influence of frequent earthquakes,basic earthquakes,rare earthquakes and extremely rare earthquakes.(6)Through the elastoplastic dynamic time history analysis of the structural model,the deformation curves of each model structure are studied.The statistical analysis shows that the structural vertex displacement angle is smaller than the maximum interlayer displacement angle under different earthquakes.(7)According to the different seismic action levels of the fabricated frame structure,the structural model capability curve is calculated and the seismic performance evaluation method based on the displacement angle of the assembled monolithic reinforced concrete frame structure is given.Transform the capability spectrum S_a-S_d curve to?-S_d curve,and compared with the seismic demand spectrum under different intensity to determine the performance point,and the vertex displacement angle and the maximum interlayer displacement angle are adopted to assess seismic performance.