Seismic Behavior Analysis Of L-Shaped And Groove Shaped New Gypsum Concrete Composite Wall

Green and energy-saving building is the trend of China’s construction industry development,the design and development of energy-saving green building materials is the key to promoting green building.Our group designed a new type of composite wallboard which is filled with concrete in the gypsum board cavity to form vertical dense columns and transverse beams,and a series of experimental studies were carried out.As a kind of prefabricated building materials,joints are the key parts of the structure.Under the action of earthquake,the mechanical behavior of the component joints is very complicated.Generally speaking,the joint is more prone to be damaged,and the damage will directly endanger the overall structure.In this paper,based on the results of low-cycle cyclic loading tests of the L-shaped joints of the gypsum concrete composite wall,analyze the seismic performance of the composite wall joints through low-cycle reciprocating numerical simulation and finite element analysis.The main contents of this paper include:1.Abaqus software is used to establish the finite element model of the L-shaped joint of the composite wallboard.The finite element method is used to calculate the L-shaped joint model under horizontal and vertical loads.The calculated results are compared with the experimental results of L-shaped wall joints.The calculated skeleton curves,bearing capacity and failure modes can be well coincided with the experimental results.2.Based on the fact that the finite element method can accurately simulate the experiment,an overall groove wall model is established for analysis.The models of the transverse rebar extending into the core of the joint and the transverse rebar not extending into the core of the joint were established respectively.The failure characteristics,bearing capacity,hysteretic behavior,ductility coefficient,energy dissipation performance and stiffness degradation of the two are compared.The seismic performance of the wallboard connections with transverse reinforcement extending into the core of the node is better than that of the wallboard joint with the transverse reinforcement not extending into the core of the joint.3.The finite element method was used to analyze the mechanical behaviors of the new composite wall grooved specimens with different axial compression ratios.The influence of axial compression ratio on the stress of the grooved wallboards was analyzed based on the failure modes,hysteresis curves and various parameters.The results show that with the increase of axial compression ratio,the horizontal bearing capacity and the initial lateral stiffness of the slotted wallboard increase,but the ductility and energy dissipation capacity decrease and the stiffness degradation declines.When the axial compression ratio exceeds 0.54,the damage has the characteristics of brittle failure,such composite wallboard axial compression ratio should not exceed 0.54.