Seismic performance of a low yield point steel link with corrugated web for RC double-column bridge bent

Abstract

This study investigates the seismic performance of reinforced concrete (RC) double-column bridge bents incorporating low yield point steel (LYP steel) corrugated shear web (LCSW) links, with the aim of enhancing post-earthquake functional recoverability. Based on the previous experimental study, finite element (FE) simulations were conducted to further evaluate the hysteretic behavior of LCSW links, with a focus on key design parameters such as span-to-height ratio, flange slenderness ratio, flange-to-web thickness ratio, and corrugation profiles. The parametric study revealed three distinct failure modes in LCSW links: (1) yielding of the corrugated shear web (CSW) and flanges, (2) yielding of the CSW accompanied by local buckling of the flanges, and (3) global shear buckling of the CSW with yielding of the flanges. The use of LYP160 steel significantly enhanced the energy dissipation capacity of the links. Additionally, LCSW links with a span-to-height ratio of less than 1.0 and corrugation angles of at least 45° demonstrated improved hysteretic performance. Optimal design recommendations include a flange-to-web thickness ratio greater than 2.5 and an initial horizontal panel-to-wavelength ratio of 0.34 for CSW. FE simulations of RC double-column bridge bents with LCSW links demonstrated superior hysteretic behavior and stable energy dissipation compared to conventional RC bents, achieving a 65 % increase in peak load capacity and a 35 % improvement in ductility. Furthermore, bents equipped with LCSW links exhibited minimal damage relative to those with RC links, effectively protecting the main structural components and providing a reliable solution for rapid post-earthquake recovery of bridge bents. These findings highlight the potential of LCSW links as an innovative technology for enhancing the seismic resilience and recoverability of bridge structures.