Avoiding Disproportionate Collapse
336140 - ALTERNATIVE LOAD PATH ANALYSIS FOR MID-RISE MASS-TIMBER BUILDINGS
Friday, April 20
11:00 AM - 12:30 PM
Alternative Load Path Analysis (ALPA) is generally considered as the preferred approach for evaluating the robustness of structures, a strategy for disproportionate collapse prevention. The Disproportionate Collapse Technical Committee of the Structural Engineering Institute is currently developing guidelines, along with example analyses on how to perform the ALPA, to help designing structures that can bridge over damages caused by abnormal loads without propagation. However, being a new method of construction, mid-rise mass-timber buildings are not included and few studies are available on this topic. To safely expand the application of mid-rise mass-timber to constructions such as military and post disaster buildings, studies with respect to disproportionate collapse prevention are required.
This paper presents ALPA of a nine-storey timber building, with Glulam columns and Cross-Laminated Timber for gravity loading and lateral force resistance system. Nonlinear dynamic analysis is the preferred method to capture a realistic approximation of the load distribution, and hence estimate the performance of the building. The study comprises different scenarios of sudden removal of ground floor columns and investigates the subsequent structural performance. The approach fits within the chapter five, Advanced Computational Methods, of the proposed ALPA guidelines. Therefore, this study can serve as an additional example to help design professionals and code developers in the analysis for disproportionate collapse prevention for mid-rise timber buildings.