Experimental and computational assessment of shear beams as earthquake resilient measure for double-column piers supported by pile-group. (1st September 2021)

• Record Type: Journal Article
• Authors: Xie, Wen; Sun, Limin
• Is Part Of: Engineering structures. Volume 242(2021)
• Publication Date: 2021-09-01
• Subjects: Shear beams -- Double-column piers -- Strain mitigation -- Bending moment reduction -- Seismic resilience -- Shaking table tests; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2021.112509
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: Shaking table results of double-column piers with/without shear beams were obtained. Seismic responses between the double-column piers with/without shear beams were compared. Foundation-soil-structure interaction effects between the double-column piers with/without shear beams were studied. Shear beam effects on reducing seismic damage of double-column piers were validated. A finite element model could capture the response variations caused by shear beams. Abstract: The double-column pier with energy dissipation members is an effective way for achieving the seismic resilience of bridges. However, there is short of shaking table tests to assess the impacts of the energy dissipation member on the seismic response and soil-foundation-structure interaction (SFSI) of the double-column pier. Therefore, this paper aims to evaluate the effects of the shear beams on the seismic response of the double-column pier supported by the pile-group in the mixed soil, rather than the cable-stayed bridge model. Two types of double-column piers-one is a conventional double-column pier, and the other is a new double-column pier with shear beams-were built and studied in a 1/70-scale cable-stayed bridge model using shaking table tests. The dynamic characteristics, seismic responses, and SFSI effects between two types of double-column piers were compared under different earthquake waves. Test results revealed that the shear beams significantly decreased the reinforcement strain and the bending moment of the double-column pier. The SFSI effects on the double-column pier with shear beams are more significant than the double-column pier. Also, the computational model developed in OpenSees could reproduce the seismic responses of the double-column piers with and without shear beams and detect the seismic response variations induced by the shear beams. The shear beam was earlier yielding than the column and dissipated the earthquake input energy so that the column could remain elastic under the El Centro with 1.4 g. Consequently, the effects of the shear beam on mitigating the seismic damage and enhancing the seismic resilience of the double-column pier were validated.