AISC - DESIGN GUIDE 26
Design of Blast Resistant Structures
|Publication Date:||1 January 2013|
The purpose of this guide is to disseminate knowledge of blast resistance and progressive collapse mitigation to the structural engineering community, presenting basic theory with design examples so engineers and architects can achieve simple and effective designs.
Presently, security consultants with the assistance of the owner evaluate the particular vulnerabilities of a given facility and determine the appropriate and acceptable level of security risk. The risk assessment study determines the location and the size of the explosive threat. The blast consultants then calculate the blast pressures and review the design produced by the engineer of record. If the design is found to be insufficient, the blast consultant recommends upgrading the design and these revisions are incorporated into the construction drawings. It is advisable to involve the security consultant and blast consultant as early as possible in the planning and design process.
There is enough information provided in this guide to allow practicing structural engineers with a background in structural dynamics to interact with blast consultants to produce effective designs. The engineer of record can then proceed with the structural design based on the blast pressures given by the blast consultant. As it is with any unusual design, a peer review is a good idea and it is suggested that the final design be reviewed by a qualified blast consultant with experience in the design of blast resistant structures. This guide is divided into the following chapters:
Chapter 2 addresses external blast explosions and is focused on the shock wave-not on fragment or projectile loading. The chapter does not cover the loads generated by a large blast in close proximity to the structure.
Chapter 3 addresses the evolution of documents related to the design of buildings for blast loading and provides guidance on the relevant factors in protective building design.
Chapter 4 addresses methods of dynamic analysis, simplifying multiple degrees of freedom into single degree of freedom systems, and determining the dynamic response to defined loads. It also explains the use of general structural engineering software to solve simple multiple degree of freedom problems.
Chapter 5 addresses the overall response of a building's structural system to blast loading.
Chapter 6 addresses member design, failure modes and design criteria including breaching, shear failure and bending.
Chapter 7 addresses steel connection design for blast loading.
Chapter 8 addresses basic progressive collapse concepts. Progressive collapse design is independent of blast design because progressive collapse may be caused by other possible events such as fire, accident, impact, etc. Examples demonstrating the determination of the structural response to progressive collapse are included.
The guide addresses only the behavior of structural steel under blast loading. It does not cover doors, windows, or any other structural material.