Integrated Blast Risk Assessment for Improved Preparedness & Response

(CRTI-06-0150TD)

Simon Foo, Edward Morofsky & Brian Kyle

Professional & Technical Service Management

Real Property Branch

Ghani Razaqpur Murat Saatcioglu

McMaster University University of Ottawa

Public Security S&T Summer Symposium 2009, Ottawa, June 15-18.

Project Overview• Screening tool: preliminary risk assessment for

ranking of buildings according to risk levels

• Evaluation methodology: reliability-based approach for the evaluation of high-risk buildings to determine mitigation needs

• Retrofit technologies: guidance on the use of blast mitigation technologies

• Post-blast assessment: on-site evaluation of a building after a bomb blast attack

• Training of end-users: preparedness and emergency responders

Relevance to emergency preparedness & responder needs

Screening

Evaluation

Retrofit

Post-Blast Evaluation

Emergency preparedness Emergency response

Progress: ScreeningThreat

Vulnerability

Consequence

Risk

Standoff distance, building geometry (length, height, number of floors), frame/wall construction, window type & percentage

Building area, number of occupancy, affected (damaged) area with respect to vulnerability

Threat x Consequence

Building function, Security measures, charge weight

• Refined P-I diagrams for uniformity of the criteria for damage assessment being evaluated against available diagrams & test data

Progress: Retrofitting• Experimental investigation of as-is and retrofitted structural elements by University of Ottawa with support from CERL

• Shock tube became operational in December 2008

• Testing of first series of reinforced concrete members (slabs and columns) with and without seismic detailing

• Various retrofitting technologies to be considered in second series of tests

Retrofitting: Ottawa U’s Shock Tube

Retrofitting: Shock Tube Test

Progress: Evaluation• Developed computer programs which apply SDOF, MDOF concentrated mass & continuum elements to analyze structural elements

• SDOF & MDOF models developed and being evaluated against results of commercial FE software

• Objective is to compare the results of these analyses with each other & with experimental data, leading to a set of recommendations on how to properly apply each method of analysis and its expected level of accuracy

• Conducted field tests on concrete, steel and masonry members in May 2008, November 2008 and May 2009

Progress: Post-Blast Assessment• Framework for a post-blast evaluation methodology developed, including safety classification levels and the initial development of the criteria used in the classification

• Work underway on developing specific criteria for each type of classification and for different building types & structural systems

• Further development of the methodology awaits the evaluation of analysis tool and the test data

Acknowledgement• Chemical, Biological, Radiological/Nuclear, and Explosives Research Technology Initiative (CRTI-06-0150TD)

• Centre for Security Science

• Project Partners:– NRCan/CERL (Canadian Explosives Research Lab)– RCMP Technical Security Branch– McMaster University– University of Ottawa– ABS Consulting