Study On The Seismic Performance Of Newly Modular Assembled Single-layer Composite Shear Wall

A new type of modular prefabricated modular composite shear wall is proposed in this thesis.Based on the general finite element software ABAQUS,the corresponding numerical analysis and calculation model is established.On the basis of verifying the correctness of the numerical simulation model,the parameters of height-width ratio,height-thickness ratio,bolt arrangement and spacing,bolt length-diameter ratio as well as concrete strength and thickness are taken into account to analyze modular assembled composite shear walls with two-sided connection.Then the parametric analysis of modular assembled composite shear wall with four-sided connections is carried out considering the parameters of axial compression ratio,aspect ratio,thickness ratio,stiffness ratio and concrete strength.Finally,in order to reduce the extrusion damage of frame columns to concrete slabs and the influence of composite shear wall on frame columns,five optimum schemes are designed to study and analyze the connection mode between modular assembled composite shear wall with four-sided connections and frame column,and the optimum scheme is selected.The main research work and conclusions of this thesis are as follows:1.A new modular prefabricated modular assembled composite shear wall is proposed.The composite shear wall is a kind of lateral resisting element composed of built-in steel plate,steel plate connector,extension plate connector and cast-in-situ concrete slab on both sides.It has the advantages of good bearing capacity,energy dissipation capacity,convenient installation,convenient transportation,green energy saving and environmental protection as well as it can effectively provide lateral resistance for high-rise buildings.2.Based on ABAQUS general finite element software,the existing finite element model of prefabricated modular composite shear wall test is established,and the simulation results are compared with the test results to verify the correctness of the established finite element model.The analysis results show that the hysteresis curve and skeleton curve of the two results are in good agreement.The error of yield bearing capacity,peak bearing capacity,initial stiffness and maximum error are 7.53%,1.05% and 8.26% respectively.The stress distribution is consistent with the failure mode of the specimens,which shows that the finite element numerical analysis model established in this thesis can better simulate the mechanical performance of modular assembled composite shear wall well,and verify the correctness of the simulation model.3.The effects of height-width ratio,height-thickness ratio,length-diameter ratio of bolts,concrete strength and slab thickness on the seismic performance of a new modular assembled shear wall with two sides connected are studied.With the increase of height-width ratio,height-thickness ratio,length-diameter ratio of bolts,concrete strength and slab thickness,the energy dissipation capacity,peak bearing capacity and initial stiffness of composite shear walls increase gradually;all working conditions have good displacement ductility;the accumulation of compressive damage of concrete slabs mainly concentrates on the corner of concrete slabs,and the tensile damage mainly concentrates on the middle and upper and lower ends of concrete slabs.It is suggested that the arrangement of bolts should be arranged in arrays with a spacing of 150 mm,so that the bearing capacity,initial stiffness and displacement ductility of composite shear walls are better.4.The effects of axial compression ratio,aspect ratio,thickness ratio,stiffness ratio and concrete strength on the seismic performance of a new modular assembled shear wall with four-sided connections are studied.With the increase of aspect ratio,thickness ratio,stiffness ratio and concrete strength,the energy dissipation capacity,peak bearing capacity and initial stiffness of modular assembled shear walls with four-sided connections increase gradually;with the increase of axial compression ratio,the bearing capacity,energy dissipation capacity and initial stiffness increase first and then decrease.The damage of concrete slab is similar to that of modular composite shear wall with two-sided connection,but the damage of concrete slab with four sides connected modular composite shear wall is greater.Considering comprehensively,it is suggested that the axial compression ratio should not be more than 0.2,the thickness ratio should be 35,and the stiffness ratio should be 2.5.Among the five different connection modes between modular assembled composite shear walls and frame columns,Scheme 2 has the fullest hysteresis curve,the smallest pinching effect,the largest cumulative total energy consumption and equivalent damping coefficient;The peak bearing capacity and initial stiffness of Scheme 2 are lower than those of Scheme 1,but compared with other schemes,Scheme 2 has the least decline,the peak bearing capacity is only decreased by 1.60%,and the initial stiffness is only decreased by 1.74%.Comparing the internal force distribution of frame columns of different schemes,it can be seen that compared with Scheme 1,the internal force of frame columns of Scheme 2 decreases the most,the maximum of left column decreases 34.20%,the maximum of right column decreases 38.61%;the compression damage and tensile damage of Scheme 2 is the smallest,and the development of corner cracks is also smaller than other schemes.Considering comprehensively,it is suggested to choose the best scheme of Scheme 2 to avoid the direct connection between the corner of modular composite shear wall and the frame column.