Seismic Performance Evaluation Of Reinforced Prefabricated Recycled Concrete Frame Structure

The assembled recycled concrete frame structure is a new structural system integrating assembly and green building materials.On the one hand,the factory processing of prefabricated components can effectively compensate for some mechanical defects of recycled concrete.On the other hand,recycled concrete is used as a green and recyclable material providing a reliable supply of raw materials for prefabricated buildings.Therefore,the assembled recycled concrete structure has a dual significance for promoting the industrialization of building construction and the promotion and use of green building materials.Frequent earthquakes have brought heavy disasters to human beings.Building damage is the primary factor threatening personal and property safety.One of the core elements to ensure building safety is structural earthquake resistance.The paper bases on the 15 assembly(non-)recycled concrete frame structures,and evaluates the seismic performance of the structure from multi-layer,multi-angle and multi-method.The main contents of this paper are as follows:(1)In the case of the replace rate of 0%,the difference analysis was made on the constitutive relation of recycled concrete of many scholars and normative concrete constitutive relation.The paper chooses the constitutive relationship model of Xiaojianzhuang as the mechanical basis for seismic performance analysis of recycled concrete structures.(2)Using PKPM for structural design and reinforcement calculation,this paper establishes SAP2000 finite element model(4 layers,8 layers,12 layers),and defines load conditions and structural plastic hinges.Under the condition of Pushover analysis,the difference rate between the constitutive relationship of non-recycled concrete of Xiao jianzhuang and the constitutive relationship of normative concrete has little effect on the structural response,which further proves that the constitutive relationship model of Xiaojianzhuang recycled concrete is feasible,reasonable and applicable.(3)Analyzing and processing the beam-column joints of the structure,and inputting the constitutive relationship models of Xiao jianzhuang(substitution rate of0%,30%,50%,70%,100%),the paper ultimately forms 15 target structures.Based on the pushover analysis method,The paper conducts seismic performance differenceanalysis of different substitution rate structures from the perspective of the pushover curve,limit state,yield state,displacement ductility of the structure,and the four-level fortification level point,maximum interlayer displacement angle.(4)Taking the structural dynamic time history analysis as the main line,The paper selects the ground motion record,and conducts the comparative analysis of the dynamic analysis and the static calculation results,and proceeds dynamic time history analysis for the reference structure and the recycled concrete structure(replacement rate of 50%)based on the four-level fortification level,and marches the seismic performance analysis of structural base shear force,vertex displacement,interlayer displacement angle and other performance indicators.(5)The paper calculates the overall super-strong coefficient,ductility reduction factor and reaction correction coefficient ability value of the structure based on pushover analysis method,and calculates the demand spectrum of each performance coefficient of the structure under the four-level fortification standard.Ultimately based on the seismic performance coefficient capacity demand ratio,the paper conducts quantitative evaluation and analysis of the super-capacity and inelastic deformation ability of the structure.(6)The paper studies the hysteretic energy analysis method of MPA,and calculates the hysteretic energy value of 15 structures,and analyzes the influence of the replacement rate of recycled aggregate on the hysteretic energy consumption of the structure.