Full Session with Abstracts
The Disproportionate Collapse Technical Committee of SEI is preparing a guideline on Alternative Load Path Analysis (ALPA) to provide design, analysis, and modeling methods for engineers in practice to reduce vulnerability of steel and concrete structures. Chapter 3 of this guideline addresses simplified analysis to predict collapse resistance and is the topic of this presentation. Chapter 3 focuses on simplified analysis methods that can be applied in the form of spreadsheets or closed form solutions to predict the collapse capacity of steel and concrete buildings. The chapter uses available experimental data to verify methods to find static force-deflection curves for steel frames with WUF and RBS moment connections; steel frames with shear tab and single and double angle connection, reinforced concrete intermediate and special moment frames, flat plates, and steel composite gravity frames. Once the static force deflection is known the collapse resistance for column removal can be found using energy balance procedures discussed in chapter. At the final section of the chapter examples of 10 story buildings are analyzed using the methods provided in the chapter.