Seismic Analysis Of Ultra-high Performance Concrete Shear Wall With High-strength Steel Bars

Shear wall plays a very important role in the building structure,its seismic performance is directly related to the building whether can resist the earthquake action without collapse.The mechanical properties of ordinary reinforced concrete are average,and when it is installed in a shear wall,it is easy to make the wall too thick.When ensuring the strength of the wall,it is not only easy to make the cross section of the wall larger,but also consumes too much material,which greatly increases the difficulty of construction.Using reactive powder concrete or high strength steel bar can reduce the material consumption,reduce the cost,and can improve the mechanical properties of shear wall under earthquake action.In this paper,the seismic performance of reactive powder concrete shear wall with HRB600 reinforcement is analyzed,which is helpful to popularize the application of HRB600 reinforcement and reactive powder concrete in practical engineering.In this paper,the fiber element method is adopted and the finite element software OpenSees is used to write the code for the analysis of ordinary reinforced reactive powder concrete shear wall.The numerical analysis results are compared with the experimental results in literature [1],and the reliability of the established model method and the accuracy of numerical simulation are verified.Then,based on different reinforcement forms,three pieces of reactive powder concrete shear walls with HRB600 reinforcement were designed,and the numerical simulation was also carried out after the model was established.By comparing the results with the test members,the bearing capacity is increased by 25.8%,22.1% and 23.9%,respectively.The ductility of wall distribution bars and dark column longitudinal bars is improved by 42.9% and 52.9%respectively by HRB600 reinforcement,which indicates the superiority of high strength reinforcement.On this basis,the paper also designs the 12 pieces of different parameters under the condition of shear wall,analysis of the axial compression ratio,aspect ratio,ratio of longitudinal reinforcement and depth of dark column and steel reinforcement ratio of metope distribution of HRB600 reinforced reactive powder concrete shear wall seismic performance and the effect of which discuss high strength steel and reactive powder concrete shear wall in the collaborative.The results show that: 1)with the increase of axial compression ratio,the bearing capacity of shear wall increases continuously,but the energy dissipation capacity and deformation capacity of shear wall become worse and worse,and the stiffness degradation rate becomes faster and faster,which indicates that the excessive axial compression ratio is not beneficial to the seismic performance of shear wall.2)With the increase of the aspect ratio,the bearing capacity of the shear wall will decrease continuously,but in a certain range,the deformation capacity will gradually increase,and the energy dissipation capacity will also become stronger and stronger.Therefore,it is necessary to reasonably control the aspect ratio of the shear wall within 1 to 2 in order to obtain better seismic performance.3)Although the bearing capacity of shear wall can be effectively improved by increasing the reinforcement ratio of longitudinal reinforcement of dark column,the stiffness degradation rate becomes faster and faster,and the deformation capacity also presents an unstable trend.When the reinforcement ratio increases from1.88% to 7.54%,it first increases and then decreases.4)The change of reinforcement ratio of wall distribution bars has little effect on the seismic performance of HRB600 reinforced reactive powder concrete shear wall.When the reinforcement ratio is increased,the increase of the bearing capacity and energy dissipation capacity of the shear wall is very small,and the deformation ability will become worse.Therefore,there is no need to configure too many wall distribution bars in practical use.