Seismic performance of a self-centering beam-to-column connection considering corrosion of replaceable component

The purpose of the current study is to reveal the effect of corrosion on seismic performance of a self-centering (SC) beam-to-column connection, and thus to provide guidance on durability design of such kind of connections. Accelerated corrosion test was first conducted on the energy dissipation components (dog-bone plates). Extra round bar coupons cut off from the plates were also tested considering the effect of corrosion, cyclic tests at structural member level were then carried out. The effect of the generation of rust layer on friction coefficient of plate surface was studied. Finite element (FE) model was built to predict the seismic behavior of the connection considering corrosion. On the basis of simulation results, the influence of friction coefficient on the seismic performance of the connection was analyzed. The experimental and numerical analysis show that the friction coefficient between the replaceable component and adjacent components increases after corrosion, and thus leads to increased load-carrying and energy dissipation capabilities of the SC connection, but the self-centering ability is compromised. When the friction coefficient is increased from 0.33 to 0.8, the increase of equivalent yield force, equivalent yield displacement, peak load, initial stiffness, cumulative energy dissipation, and residual deformation are 2.71%, 0.26%, 3.12%, 7.28%, 6.88%, 14.52%, respectively.