Abstract:In order to analyze the influence of connection components on pier-bottom connection performance of assembled piers, three new types of pier-bottom connection modes has been raised ,including straight-groove connection pier model, skew-groove connection pier model and arc-groove connection pier model, based on the existing grouting sleeve connection caps and pier-column piers. The numerical models of three different connection modes are presented , and we proceed numerically simulating and contrastive analysis adopting the method of low-cycle reciprocating load. Comparing the hysteretic curve, skeleton curve, stiffness degradation, strength degradation and energy dissipation capacity of the structure, we found that the three connection modes have the same characteristics in intensity.rigidity and energy dissipation capacity.Compared with the straight groove pier model, the oblique groove pier model and the circular groove pier model are reduced by 49.8% and 53.69% respectively in the aspect of the yielding displacement, 17.4% and 19.9% in yield load, 19.6% and 18.7% in ultimate load, 46.1% and 42.1% in energy dissipation capacity , but in maximum residual displacement the data are increased by 12.2% and 30.1%, respectively. Thus it can be seen that the pier with straight groove connection has better mechanical properties and better energy dissipation capacity. We concluded that the pier model with straight groove connection has the best performance in normal usage and seismic load-bearing, and can be well applied to the assembled pier.