| The steel and polyurethane composite shear wall is the main force member of the high-rise and super high rise building structure to resist lateral deformation.Its structure and structure is to pour the polyurethane material into the gap formed by the two sides of the steel plate,so that it is combined into the whole "sandwich" bearing member.In order to fully understand the seismic performance of the new shear wall in the structure,this paper will combine the theoretical analysis and the finite element simulation two methods to carry out the research,the main research content is as follows:(1)At present,the related tests of new shear walls have not been carried out yet,but the new shear walls are built on the basis of common steel plate shear walls.Therefore,according to the existing two groups of steel plate shear wall test specimens,the corresponding ANSYS finite element model is established.The simulation results are compared with the bearing capacity,initial stiffness and ductility of the test.The results are consistent,and the feasibility of the finite element software simulation is verified.(2)Based on the common steel plate shear wall,a new shear wall model(Base model)was designed.The ANSYS finite element software was used to compare the force characteristics of the common model and the Base model under unidirectional loading and cyclic loading modes.The results show that the new shear wall can improve the shear resistance static behavior and hysteretic behavior of the structure.(3)To change the main performance parameters of the Base model,including the thickness of steel plate,the thickness of polyurethane,the cross height ratio and the lateral stiffness of the column,and study the shear static performance and hysteresis performance of each model under two loading modes of unidirectional loading and cyclic loading.It is obtained that the increase of the thickness of polyurethane has little effect on improving the initial stiffness and the yield bearing capacity of the structure,but the increase of the bearing capacity of the plastic stage is obvious,and the ductility and energy dissipation capacity of the structure will be greatly improved.The greater the thickness of the steel plate,the stress performance of the model under the two loading modes is prominent.But the difference of energy efficiency is prominent when the peak displacement is more than 15 mm.The increase of the cross height ratio,the increase of the stability,the decrease of the plane deformation,the increase of the bearing capacity,the decrease of the utilization ratio of the embedded composite shear wall,the increase of the side coefficient of the frame column,the bearing capacity and the resistance of the column.With the increase of deformation capacity,the tension belt of embedded composite shear wall can be further developed,and the mechanical performance will be improved.(4)Equivalent tension-compression rod simplification model is used to simulate the force mechanism of a new type of shear wall under unidirectional horizontal displacement load.The tension zone is based on the tension strip of the steel plate as the simplification basis of the tension rod,and the pressure zone has A spring-constrained composite pressure bar simulates the effect of polyurethane on the out-of-plane deformation of both steel plates.Based on the simplified model,the formula for the shear capacity of the new composite shear wall is proposed.Among them,the spring stiffness k of the combined pressure bar is the main parameter that influences the calculation of bearing capacity,and after analysis,its variation law and linear relationship are obtained.The final calculated load-displacement curve is in good agreement with the finite element simulation curve.At the same time,the validity of the simplified model and the correctness of the theoretical analysis process are further confirmed by the validation model. |
PDF Full Text Request