Seismic performance of precast segmental square hollow columns with different design details: Experimental and numerical study

Abstract

In this study, quasi-static test and numerical simulation of five 1/3-scale precast segmental bridge column specimens are conducted. The five specimens are of the same design details in terms of outer dimension, while different cross-sectional types, number of segments, connection reinforcement types, and energy dissipation strategy are compared in terms of seismic performance. Based on the experimental results, hollow section exhibits similar seismic performance to the solid cross-section bridge column, and specimens with prestressed tendons have shown lower energy dissipation capacity, while energy dissipation tubes are effective in improving the capacity. Joint interfaces within the plastic hinge region are of greater influence of the structural integrity. A new finite element model is proposed, and maximum deviation from test results are less than 6 % in terms of stiffness and peak strength. This demonstrates that the Parallel material for rebar modeling and ZeroLength element for joint interface (including bond-slip behavior of rebar) simulation are both effective. Based on the parametric study, the recommended factors of the material elements are proposed for optimal numerical modeling accuracy.