| Steel-concrete composite shear wall is a kind of lateral force resistant member with good seismic performance,which has been extensively used in high-rise buildings and super high-rise buildings.On the basis of steel-concrete composite shear wall,a new type of combined shear wall has been developed in recent years,that is steel tube filled concrete composite shear wall or multi-cavity steel tubular concrete composite shear wall.The results show that,compared with ordinary combined shear wall,the steel tube filled concrete combined shear wall is not only conducive to assembly construction,but also has preferable seismic performance.However,there are many problems in the steel tube filled concrete composite shear wall with large length and small shear span,such as obvious shear effect,relatively low ductility and energy dissipation capacity.In order to solve the problems of obvious shear effect,relatively low ductility and energy dissipation capacity of the wall with low shear span ratio,a new type of slotted energy dissipation combined shear wall is proposed in this paper,that is steel tube filled concrete combined shear wall with slits.By means of setting slits,the shear effect of wall is reduced,its failure state is changed,and its seismic performance is improved.Through the quasi-static test of four shear wall with slits and a pair of shear-walls without slit,the mechanical properties of the steel tube bundle composite shear wall with slits are analyzed under low-cycle reverse loading.The influence of different slits parameters on the mechanical properties of the wall was discussed,and the performance of the wall with and without slits were analyzed comparatively.The experimental results show that when the shear wall has large length and small shear span,the shear deformation is obvious and its ductility is limited.Setting slits in shear wall can reduce the shear effect,reduce the proportion of shear deformation in the total deformation of the wall,change its failure state,improve its ductility,and reduce the stiffness and bearing capacity to a certain extent.However,adjusting the different parameters of slits can optimize the performance of the wall,and improve the ductility performance and energy dissipation capacity while ensuring the stiffness and bearing capacity.The finite element analysis method is used to conduct numerical simulation analysis on the steel tube filled concrete combined shear wall with and without slits,and study its loading process,failure form,mechanism and performance.The influence of different slit parameters on failure form,mechanism and mechanical behavior is analyzed in theory.The simulation analysis shows that the slits change the stress state of the wall,reduce the shear effect of the wall,increase the proportion of bending deformation in the total deformation,and improve the ductility and energy dissipation capacity obviously,and the degree of improvement increases with the increase of the slit height and the depth-width ratio of the wall limbs between the slits.The larger depth-width ratio of the wall limbs will reduce the bearing capacity and stiffness obviously,but the bearing capacity and stiffness can be improved by setting multi-row slits.Based on the elastic theory,the stiffness analysis model of steel tube filled concrete combined shear wall with multi-slit and multi-row is established,and the calculation formula of the initial stiffness is derived.The comparison shows that the calculated results accord with the experimental results and can be used for elastic internal force analysis of structure. |
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