Lateral Resistance Performance Research And Analysis Of Prefabricated Concrete Wall

Prefabricated housing cost is one of the main factors restricting the development of prefabricated housing,and prefabricated ratio is the main factor affecting the cost of prefabricated housing.Therefore,it is benefited for the application and development of fabricated housing to research low cost,simple structure,good overall performance prefabricated concrete structure.To obtain a high degree of standardization of prefabricated structures and high site assembly rate,components simple installation,structural lateral stiffness,low cost and good thermal insulation properties,and meet the requirements of the doors and windows openings,this paper presents a Total Bolt Connection Prefabricated Concrete Structure,referred to as the BPC structure,and mechanical performance of the lateral resistance wall in this structure is studied by experimental and finite element analysis.The main contents and conclusions are listed as following:(1)Two full-scale specimens of the wall consisted of three standard panels are designed,and horizontal low cyclic loading test is carried out.The failure process of the wall is revealed,then the hysteresis curves,skeleton curves,stiffness,deformation capacity and ductility of the walls were analyzed to obtain carrying capacity indexes of the wall;The failure mechanism of the wall is obtained by analyzing the failure characteristics of the typical position in the wall;Finally,the ideas of calculating the bearing capacity of the wall structure and bolts are recommended by analyzing the mechanical characteristics of the wall structure.The experiment results show that: the lateral bearing capacity of BPC structure wall composed of 3 standard wall-panels is large enough to reach 500 kN.Wall hysteresis curve shows inverted S-shaped with pinching phenomenon obviously,and the energy dissipation factor is about 0.5,and energy dissipation capacity is ordinary,the displacement ductility factor of wall is 1.7 to 1.8.Wall damage is mainly located in the bolt connections of the horizontal bottom seam,and the destruction is "zigzag" shape distributions.(2)The Abaqus Finite Element Model of the BPC wall structure are established,and the mechanical behavior factors of the wall were analyzed and compared by the FEM model.Three kinds of finite element models are proposed firstly,then one of the models is selected and made improvements,which is verified reasonably by being compared to the experiment results.Then factors of axial compression ratio,reinforcement ratio,axial compression ratio and bottom bolt-connector behavior,which influence the performance of the wall,are analyzed.The results show that: the results of the finite element model is similar to the wall stiffness,failure characteristics and hysteresis characteristics.The wall initial lateral stiffness,yield load and peak load increases with axial compression ratio increasing.Wall performance is less affected by reinforcement ratio.With the wall panels increasing,the wall bearing capacity and lateral stiffness increases linearly.The initial lateral stiffness,bearing capacity index,hysteretic behavior and energy dissipation capacity of the wall will change when the bottom bolt-connector behavior changes.Through the above experimental research and FEM analysis,bearing capacity indexes of BPC wall structure,lateral stiffness degradation law,deformation,failure characteristics and the factors that influence the performance of the wall are obtained in this paper,which provide an experimental basis and theoretical guidance for further theoretical research and the project applications of BPC structures.