Study On The Basic Performance Of Damage-controllable Rocking Wall

This paper develops a damage-controllable rocking wall,which is installed inside the structures based on the damage-controllable and earthquake-resilient design concept.The wall is made up of an upper and a lower connecting beams,two middle rocking elements,the pre-stressed tendons,corner elements and a sheering damper.By relaxing the connection of the end of the wall,the deformation of the wall in the earthquake is concentrated on the rocking interface.The structure vertical weight and the pre-stressing force are applied to make sure of the structure self-centering capability after earthquake,and reduce the residual displacement.The middle part of the wall is additionally provided with a replaceable energy dissipation damper,and the main structure can be protected by energy dissipation in the earthquake.Elastic material with high ductility is used for the corner element,which will control the damage of the wall.Therefore,a structure with the characteristics of small damage,high energy dissipation capacity,damage-controllable ability and rapid repair after earthquake is proposed.In this paper,a theoretical formula is deduced,the parameter analysis,the finite element simulation analysis and the experimental research are carried out.The main results are as follows:(1)Based on the reasonable assumption of damage-controllable rocking wall,the formulas of the lateral force and the hysteretic behavior are derived.Base on the parametric analysis,the effects of the factors such as the area of pre-stressed tendons,the initial pre-stressed force,the sheering damper and the material of the corner are studied for the wall.The results indicate that the increase the area of pre-stressed tendons will improve the lateral stiffness and lateral capacity;the increase of the initial pre-stressed force will improve the lateral capacity;increasing the damping force will improve the rocking wall energy dissipation capability and lateral capacity;increasing the elastic modulus of corner element material can improve the lateral stiffness.(2)The finite element model of 10 damage-controllable rocking walls using ABAQUS software,monotonic loading and cyclic loading are simulated in different pre-stressed reinforcement area,initial pre-stressed force,the plate thickness of the sheering damper and the elastic modulus of corner element material.The results show that the finite element simulation and theoretical calculation are in good agreement;the embedded parts are set in critical position which will improve the concrete performance.(3)In order to verify the feasibility and effectiveness of the damage-controllable rocking wall proposed in this paper,3 groups of low cyclic loading tests are designed,one of them is without damper,other two are with damper,but the initial pre-stressed force is changed.It indicates that the damage-controllable rocking wall realizes the ability of damage control.In the test,1 sets of the wall complete the three group test,and there is also no damage to the wall;The wall without damper reaches the expectations of the self-centering capability and deformation capacity;the energy dissipation capability is expected to reach by the wall with damper,however,the residual displacement is existed.