Abstract
This paper numerically examines the influence of impact locations and the effectiveness of two strengthening techniques, i.e. energy dissipating (ED) bars and carbon fiber reinforced plastic (CFRP) wrapping at joints, on improving the performance of precast concrete segmental columns (PCSC) under lateral impacts. Mild steel and shape memory alloy (SMA) are used as ED bars. The numerical models are validated by test results available in literature. Different impact velocities and impact locations are considered in the parametric analysis. The impact performance of PCSC with different strengthening techniques is evaluated in terms of the effective plastic strain, deformation, and energy absorption. SMA ED bars are found more effective to reduce the residual displacement due to its super-elastic characteristic while the mild steel ED bars have better energy absorption ability. The response of PCSC is impact location dependent. When joint is impacted, segmental rotation is more pronounced, adding ED bars and CFRP wrapping at joints might not be effective to improve the column performance due to severe shear deformation of the segments. When a segment is impacted, the translational slippage of the segment is the primary response mode, the considered strengthening approaches can effectively reduce the slippage between adjacent segments of PCSC. Moreover, it is found that the deformation response of PCSC can be reduced by increasing the prestress force level, especially when CFRP wrapping is applied at segment joints. CFRP wrapping at joints is found outperforming ED bars on improving the impact resistance of PCSC.
Published Version
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