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ASI created a three dimensional model of the bridge and performed analysis using its
patented structural analysis software Extreme Loading for Structures
(ELS).
Forensic Analysis of the Minnesota I-35 Bridge Failure
ASI created a three dimensional model of the bridge and performed analysis using its patented structural analysis software Extreme Loading for Structures (ELS).
With an increase in recent Crane collapse incidents around the world comes a renewed concern for the safety of construction workers and the general public.  ASI
Forensic Engineering Analysis & Expert Witness: Crane Collapse
With an increase in recent Crane collapse incidents around the world comes a renewed concern for the safety of construction workers and the general public. ASI's Extreme Loading Technology can assess the structural integrety of large cranes as well as the forensic study cases of crane collpases upon structures.

Progressive Collapse Analysis

Progressive collapse (aka: Disproportionate Collapse) occurs when a local failure spreads throughout a structure from element to element, eventually resulting in the collapse of either the entire structure or a disproportionately large part of it.   Progressive collapse is caused by an abnormal or extreme loading event, typically due to accidental impact, faulty construction, foundational failure, or violent changes in air pressure (ie: Blast).  Infamous examples of progressive collapse can be seen in such historic events as the terrorist attack on the A.P. Murrah Building and the terrorist attack on the Twin Towers of the World Trade Center on September 11, 2001.

Utilizing its proprietary Extreme Loading® Technology (ELT), ASI has the ability to accurately analyze the behavior of structures under extreme loads and to assess the risk of progressive collapse.  ELT uses the Applied Element Method (AEM) to track and analyze structural behavior from its elastic stage through cracking, element separation and collision.
 
ASI's Progressive Collapse Analysis Allows Clients to:

  • Visualize potential crack occurrences within the structure.
  • Visualize the extent and direction of a collapse.
  • Evaluate multiple threat scenarios.
  • Determine the locations which need strengthening.

Progressive Collapse Analysis Services Include:

  • Modeling and simulation of the structure with the necessary structural and non-structural components.
  • Checking the structure against the requirements of relevant progressive collapse codes such as GSA Progressive Collapse Guidelines and the UFC Progressive Collapse Design Requirements.
  • Determining the shape and dimensions of the expected collapse area.
  • Re-designing the structure to resist progressive collapse so as to avoid partial or complete collapse.
  • Making recommendations for strengthening weak points in the structure where local failure may occur.

Progressive Collapse Analysis is a Must

Currently, there is an international movement updating structural design requirements to explicitly design structures to resist progressive collapse. Among the codes that were recently updated to require progressive collapse analysis are:

  • American Society of Civil Engineers (ASCE/SEI 7-05)
  • American Concrete Institute (ACI318-05)
  • National Building Code of Canada (NBC 2005)
  • International Building Code (IBC 2009)
  • Eurocode 1
  • British Standard Institute (BS 5950-2000)
  • Saudi Building Code (SBC 301-2007)

Additionally, many governmental bodies have released specific codes relevant to the design of special structures to resist progressive collapse. [US General Services Administration, US Department of Defense, and US Federal Highway Administration.]

Progressive Collapse Analysis is a Must