Evaluation of seismic performance of as‐built and retrofitted reinforced concrete frame structures with LAP splice deficiencies. (16th June 2021)

• Record Type: Journal Article
• Authors: Opabola, Eyitayo A.; Elwood, Kenneth J.; Liel, Abbie B.
• Is Part Of: Earthquake engineering and structural dynamics. Volume 50:Number 12(2021)
• Page Start: 3138
• Page End: 3159
• Publication Date: 2021-06-16
• Subjects: bond‐critical -- collapse fragility -- hinge models -- lap splice -- nonductile buildings -- nonlinear analysis -- retrofitted structures -- seismic performance; Structural dynamics -- Periodicals; Earthquake engineering -- Periodicals; 624.1762
• DOI: 10.1002/eqe.3503
• Languages: English
• ISSNs: 0098-8847

Abstract

Abstract: Several studies have looked at the development of hinge models to simulate the hysteretic response of flexure‐ and shear‐critical reinforced concrete (RC) beam‐column components from damage initiation to onset of gravity collapse. However, few studies have been conducted to develop similar models for older type bond‐critical beam‐column components. First, using existing experimental data, this paper describes the calibration of simple and efficient hinge models to simulate the inelastic hysteretic response of as‐built and retrofitted splice‐deficient columns. Subsequently, to demonstrate the applicability of the hinge models, the seismic performance of as‐built and fibre‐reinforced polymer (FRP) ‐retrofitted two‐ and four‐story nonductile RC frame buildings with splice‐deficient columns are assessed using nonlinear dynamic analysis procedures. The results show that buildings with bond‐critical columns may have a lower collapse potential than buildings with shear‐critical columns, implying that in certain cases a longer splice length may actually worsen performance. According to the analyses, local retrofitting of the columns can significantly improve the seismic performance of the buildings. Contrary to results presented in this study, a significant U.S. evaluation methodology for RC frame buildings, FEMA P‐2018, indicates that buildings with bond‐critical columns have similar collapse potential as buildings with shear‐critical columns. Modifications are proposed to improve the FEMA P‐2018 provisions. The modelling approach presented in this paper are recommended for incorporation into ASCE/SEI 41, engineering practice and future research.