Research On Seismic Damage Of New Type Gypsum Concrete Composite Wallboard Members And Structures

The new type gypsum concrete composite wallboard indicates that a horizontal gypsum hole cavity is set in the vertical gypsum hole cavity of the common gypsum concrete wallboard.By setting the steel bar and pouring concrete to form the lattice form of the dense column and the beam,the integrity of the wall plate is improved.The new type gypsum concrete composite wallboard is a new type of green building shear wall panel.As the state and government actively advocate the development of energy saving and environmental building materials and the wide application of the corresponding building materials and architectural forms,it is necessary to conduct seismic performance study and seismic damage analysis.The main research contents of this paper are:(1)According to two groups of new type gypsum concrete composite wallboards under low cyclic loading,the damage phenomenon and the mechanics performance of the wallboard under the different limit state were deeply analyzed,and damage characteristics were described from three aspects of crack development,stiffness degradation and cumulative hysteretic energy dissipation.Based on the analysis results,the feasibility of the crack quantity as the damage parameter was analyzed,and the calculation formula of the closed fracture coefficient was put forward,and the damage of the crack was calculated.(2)A two-parameter seismic damage model and a simplified model based on crack quantity and cumulative hysteretic energy were proposed,and the damage quantification criterion of the new plaster concrete composite wallboard was given.The damage value of the damage model was used as the cyclic degradation index,and a hysteretic rule against the characteristics of the reverse S hysteresis loop was proposed,and the hysteretic curve of the two types of composite wallboard was simulated.Based on nine pieces of reinforced concrete shear wall data were selected from the literature,the applicability of simplified model of crack damage in reinforced concrete shear wall components were studied,and the damage was calculated and compared.(3)The finite element software ABAQUS was used to model twelve layers of pure shear wall structure in a high-rise building.The type of wall plate was the ordinary reinforced concrete shear wall,the new plaster concrete composite inner wall plate and the composite exterior wall plate.Seismic waves were input to the whole structure with small earthquakes,medium earthquakes and large earthquakes respectively,and then the seismic response analysis was carried out.Finally,the seismic damage analysis was carried out by weighted coefficient method and integral method.