Invited Seminars - University of Naples Federico II
© 2018 EPFL
Professor Lignos gave two invited seminars in University of Naples Federico II in June 13 2018. The titles of the seminars were as follows:
"Life-Cycle Costs of Steel Frame Buildings Subjected to Earthquake Loading" and "Steel Columns under Multi-axis Cyclic Loading: Experiments, Digital Twins and Reparability Curves".
Title: Steel Columns under Multi-axis Cyclic Loading: Experiments, Digital Twins and Reparability Curves
Abstract: This talk discusses a coordinated experimental and numerical research program that characterized the hysteretic behavior of steel columns under multi-axis cyclic loading. Several parameters were interrogated including the column geometry, boundary conditions and the imposed loading history. The experimental results served for the development and validation of state-of-the-art finite element models (so-called "digital twins") of different resolution. The test data and models were utilized to improve the current provisions for the seismic design of steel moment-resisting frame systems, the recent updates of the ASCE 41 nonlinear component models for steel columns. The test data were also utilized for the development of steel column fragility curves to facilitate building-specific loss assessment. Column reparability curves were also developed that can aid the decision making for repair actions.
Title: Life-Cycle Costs of Steel Frame Buildings Subjected to Earthquake Loading
Abstract: This presentation summarizes a research study that investigated the earthquake-induced risk and associated life-cycle costs of code-conforming steel frame buildings. The research work is based on the performance-based earthquake engineering framework that considers ground motion uncertainties, integrated numerical modeling validated test data assembled in structural performance databases, the assessment of engineering demand parameters that influence the structural and non-structural damage control in the aftermath of earthquakes, and the utilization of risk-consistent metrics that quantify monetary losses over a building's life expectancy. It is shown that depending on the regional seismicity, alternative lateral load resisting systems may be effective in minimizing a building's life-cycle costs.