Seismic Behavior Analysis Of 600MPa Grade Reinforced Concrete Small Block Shear Wall

600MPa grade steel bar is a high-strength steel bar popularized by the state in recent years.It has the advantages of high strength,good ductility and high purity compared with ordinary steel bars.If 600 MPa grade steel bars are used to replace the common steel bars in the current project,the amount of steel bars will be greatly reduced under the same force requirements,with obvious economic and social benefits.In order to provide a theoretical basis for the practical use of 600 MPa grade steel bars,it is necessary to conduct experimental research on the main performance of 600 MPa grade steel bars in structural design.In this paper,the seismic behavior of 600 MPa grade reinforced concrete block shear wall is simulated by finite element analysis,which provides basic research for the design and application of 600 MPa grade steel bar.In this paper,the seismic behavior of 12 finite element wall models under the influence factors of steel strength grade,vertical reinforcement ratio,horizontal reinforcement ratio,aspect ratio and opening size is studied.The modal analysis of the wall is carried out.Harmonic response analysis and performance of the wall under low-cycle repeated loading,explored the variation law of the wall under various stress conditions,and the seismic resistance of the masonry wall with 600 MPa grade steel and the common reinforced masonry wall.Performance is compared.The first-order vibration modes of the 600MPa-grade reinforced concrete block shear wall are all translational bending deformation along the length of the wall.This shows that the wall is evenly and reasonably stressed,and its torsional stiffness is greater than the anti-lateral stiffness.The stiffness has a weakening effect.The larger the hole is,the lower the natural frequency of the wall is.The increase of the vertical reinforcement ratio of the wall and the reduction of the aspect ratio can reduce the period of vibration of the wall.Under the action of the X-direction excitation force,when the wall with a small aspect ratio is excited by the frequency of 5.15 Hz and 15.73 Hz,the amplitude of the harmonic response resonance of the wall reaches a peak,and the wall with a large aspect ratio is at 2.51.A large displacement response occurs at Hz and 9.02 Hz.The overall trend of the open wall is basically the same as that of the unopened wall.The frequency of the maximum displacement response appears at 4.49 Hz and 10.64 Hz.When designing,the simple harmonic load of the structure should be avoided as much as possible between the two values to avoid unnecessary loss of the structure due to resonance.The model wall produces the first crack in the corner of the wall and extends to the wall panel with the horizontal reciprocating load.The crack generated by the wall panel develops in an x-shaped cross.The longitudinal reinforcement and the stirrup in the shear wall structural column are made of high-strength steel.The wall's anti-lateral stiffness and ultimate displacement,and the wall panel is equipped with high-strength steel to increase the ductility coefficient of the model by 24%,but the ductility of the high-strength steel in the longitudinal column and stirrups of the end column is reduced by 2.2%,4.1,respectively.%,and the energy consumption of the wall is obviously enhanced;reducing the aspect ratio reduces the ductility coefficient of the wall by 35.4%,but increases the anti-lateral stiffness;increases the vertical reinforcement ratio of the high-strength steel wall,at each stage The equivalent viscosity coefficient decreases,and the ductility decreases by 6.1% and 12.7% respectively.The horizontal reinforcement ratio of high-strength steel walls is increased,the energy consumption capacity is increased,and the ductility is increased by 27.4% and 62.6%,respectively.The increase of the hole,the energy consumption is reduced,and the ductility is reduced by 22.4% and 62.9% respectively.Comparing the seismic performance of the concrete small block shear wall with 600 MPa grade steel bar and the masonry shear wall with common steel bar,it is found that the shear wall deformation ability of the end column with 600 MPa grade steel bar is improved,and the high strength stirrup can improve the concrete.The restraining effect,the bearing capacity is larger,the crack development is slow,but the ductility is slightly reduced;the high-strength steel bars in the vertical steel bars and horizontal steel bars in the wall panel can improve the rigidity of the shear wall and increase the integrity of the shear wall.The ductile growth is obvious,and the deformation ability of the model wall is fully utilized.