Abstract
In general,Self-Centering Pier(SCP) consists of load bearing components,self-centering components,energy dissipaters and joints(e.g.tongue groove joint etc.).SCP has outstanding reparability and negligibly small post-earthquake residual deformation.Its mechanical characteristics,including bearing capacity,lateral stiffness and hysteretic behaviour are analyzed theoretically.The analytical expression of the lateral stiffness of SCP as a function of the flexural stiffness of load bearing components,the tensile stiffness of self-centering components and energy dissipater,the initial pretension and the physical dimension of pier is derived.The concept and formula of the intrinsic lateral stiffness of SCP are proposed to reveal the inherent property of SCP.The upper bound and lower bound of SCP lateral stiffness are the flexural stiffness of load bearing components and the intrinsic lateral stiffness of SCP respectively.The fan-bladed hysteretic behaviour of SCP is the result of superposing the hysteretic behaviour of energy dissipaters upon the self-centering components.Based on performance-based design principle,self-centering 3 steps(SC3S) design method in which post-earthquake residual deformation is considered,is proposed for engineering practice.
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