Title: Recommendations for Nonlinear Finite Element Analyses of Reinforced Concrete Columns Under Seismic Loading up to Collapse

Author(s): Seyed Sasan Khedmatgozar Dolati, Adolfo Matamoros, and Wassim Ghannoum

Publication: Symposium Paper

Volume: 358

Issue:

Appears on pages(s): 230-250

Keywords: collapse, column, finite element, reinforced concrete, shear capacity

DOI: 10.14359/51740238

Date: 9/1/2023

Abstract:
Post-earthquake evidence shows that shear failure in non-ductile detailed columns is a major source of structural collapse and earthquake deaths. Nonlinear continuum finite element (FE) models were constructed and calibrated to experimental tests for nine columns sustaining shear and axial degradation during cyclic loading. The primary objective of this study was to develop FE guidelines for simulating the lateral cyclic behavior of concrete columns sustaining shear degradation and axial collapse, such that wider parametric studies can be conducted numerically to improve the accuracy of assessment methodologies for such critical columns. Selected columns covered a practical range of axial loads, shear stresses, transverse reinforcement ratios, longitudinal reinforcement ratios, and shear span to depth ratios. The crack width, the damage in concrete and reinforcement, the drift at axial and lateral collapse, and the shear capacity of columns are compared with experimental results and standards equations from ASCE 41-17 and the ACI 318-19. It is observed that material model parameters recommended in this study are delivering relatively high accuracy for columns with span-to-depth ratios above 2 up to the axial collapse, and for columns with span-to-depth ratios below 1 up to the lateral failure.