Nonlinear Structural Analysis: Failure Modes and Equivalent Frame Models

This lecture covers in-plane failure modes in structures, emphasizing the importance of capturing effects like moment capacity dependency on axial force and axial elongation due to rocking. It discusses typical modelling assumptions and criteria for failure. The concept of equivalent frame models is introduced, focusing on different element formulations and their impact on results. The lecture explores the role of axial load in panels and showcases examples of macro and beam elements. It also delves into the significance of capturing axial elongation in element formulations for accurate results in hyperstatic systems. The discussion extends to out-of-plane response in equivalent frame models, highlighting the need to model connections explicitly. Additionally, a new macroelement for masonry walls is presented, addressing in-plane and out-of-plane deformations.