Title:
Nonlinear Modeling of Concrete Frame Elements Including Shear Effects
Author(s):
Serhan Guner
Publication:
Web Session
Volume:
ws_S25_SerhanGuner.pdf
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
3/30/2025
Abstract:
Current nonlinear modeling software for concrete frames typically employs one-dimensional (1D) elements with plastic hinges defined at user-selected locations. While this is a simple and computationally efficient approach, a number of drawbacks limit its application. They include the challenges with defining the interacting shear and moment hinge curves, uncertainties with hinge locations and lengths, and difficulties in capturing the post-peak response. Two-dimensional (2D) continuum methods address these limitations, but their computational cost limits their applicability. This study proposes an alternative modeling method, and associated computer software, with the objective of combining the simplicity of 1D frame elements with the accuracy and result visualization capabilities of 2D continuum methods. The method employs a distributed-plasticity, layered-section approach based on the Disturbed Stress Field Model (DSFM). The distributed-plasticity approach eliminates the need for defining plastic hinges while the DSFM enables capturing the shear, moment, and axial force interaction. The total-load and secant-stiffness formulation provides numerically stable solutions, even in the post-peak region. This paper presents the theoretical approach, unique aspects, and capabilities of this method. The validation studies undertaken for 148 experimental specimens, subjected to static (monotonic and cyclic) and dynamic (impact, blast, and seismic) load conditions, are also presented.