Study On Seismic Behavior Of Segmented Shear Wall For Reinforcement

The low shear wall is an important component to resist lateral force,because of its lateral stiffness,high bearing capacity is often used in engineering structure strengthening,but because of its poor deformation capacity,under strong earthquake,easy to appear in the bottom of shear wall cracks concentrated area,and the crack width is larger,the ultimate failure mode is usually shear failure or crushing failure,and the bearing capacity and energy dissipation capacity are obviously reduced.Aiming at the low shear wall of these deficiencies,proposed reinforcement mode parting shear wall,namely in the whole shear wall to set reasonable vertical joints.So,under the effect of horizontal force,the whole shear shear wall failure mode can be changed into parting shear wall bending shear failure or bending failure mode,the ductility of shear wall and deformation capacity can be improved,the energy dissipation capacity can be enhanced,thereby improving the seismic performance,can be used more effectively in the actual engineering structure strengthening.The main research contents of this paper include:(1)In order to verify the accuracy of finite element numerical calculation method,this paper first finite element numerical simulation of the existing literature of cast-in-place concrete shear wall test,the simulation results and test results for the hysteresis curve,the skeleton curve and damage Morphology and other aspects of the comparison,the results show that finite element numerical calculation is reliable and accurate.(2)By controling variable method,the number of small wall limb,small wall limb high aspect ratio and small wall width as independent variables,low cyclic loading simulation of 1/2 scale parting shear wall,the law and combined with the simulation results of the variables of the influence on the bearing capacity,the parting wall stiffness,ductility and energy dissipation capacity analyzed and summarized.The results of the simulation analyzes the influence of various variables on the bearing capacity,stiffness,ductility and energy dissipation capacity of the partition wall.The results show that:? when the number of small wall limbs and the width of small wall limbs are constant,the initial stiffness and ultimate bearing capacity gradually decrease with the increase of the aspect ratio of small wall limbs,the ultimate displacement and ductility increase gradually,and the energy dissipation capacity gradually increases;?When the aspect ratio of small wall limbs and the width of small wall limbs are constant,with the increase of the number of small wall limbs,the ultimate bearing capacity and initial stiffness of the divided wall gradually increase,and the ductility and energy dissipation capacity decrease When the aspect ratio of small wall limbs and the number of small wall limbs are the same,with the increase of the width of small wall limbs,the ultimate bearing capacity and initial stiffness of the partitioned shear wall are increased,the limit displacement is increased,ductility The coefficient is gradually reduced,and the energy consumption is getting worse.(3)On the basis of the above simulation analysis,it is assumed that the initial stiffness of the partitioned shear wall is weighted by the initial stiffness of the whole wall and the initial stiffness of the through-seam wall.The weighting coefficient is related to the number of small wall members,Aspect ratio,and height ratio.First,the initial stiffness formula of the whole shear wall is derived through theoretical deduction.Then,combined with the initial stiffness formula of the slotted shear walll in existing literatures,according to the results of numerical simulation,a multivariate function fitting method is used to establish the functional relationship between the weighting coefficient and the three variables.In this way,the initial stiffness simplified calculation formula of the partitioned shear wall that can be directly used in engineering design is obtained,which can greatly facilitate the engineering design.(4)On the basis of the above simulation analysis,it is assumed that the shear capacity of the shear wall with divided joints can be deducted from the shear capacity of the corresponding shear wall.The reduction coefficient is also similar to the number of small wall members,Small wall aspect ratio,and the height ratio.Based on the existing formula of shear strength of the whole shear wall and the numerical simulation results,it is also possible to establish functional relationship between the reduction coefficient and the three variables by using the multivariate function fitting method.The formula for calculating the shear capacity of the divided shear wall in this way can also be very convenient for engineering design.