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Special Topic
ENCI670: Special Topic: Design and Analysis for Blast Effect on StructuresThe aim of this post-graduate course is to introduce the structural engineer to the phenomena of blast waves and how they interact with structures. The course will cover the fundamentals of explosives and the properties and characterization of their blast waves and scaling laws. The interaction of the blast wave with the target structure will be examined in detail. Structural response to the blast wave will be studied from a single element as well as holistic structure perspective. SDOF dynamic methodologies for element analysis will be used to examine element response. Analysis and design of critical elements (beams and columns) for a blast environment will be studied.PreparationThis course benefits from a background in structural analysis and structural dynamics. A brief introduction into the essentials of structural dynamics is provided for those not well prepared in this area.
Subject to approval of the Head of Department.
This course will provide students with the opportunity to learn the fundamentals of design and analysis of buildings loading by blast through a combination of; lectures, where concepts are introduced; assignments, and finally a major project to delve more deeply into a specific topic within the scope of the course.Course ContentThe content of the course is outlined as follows (draft): Day 1: Resilience and Explosives• Introduction to resilience• Explosives; and• TNT EquivalenceDay 2: Blast Waves & Structures• Air Blast Waves• Reflection and Clearing• Loading Regimes and Target Response• Simplified Loading Curves• Blast Walls• Interior Blast and VentingDay 3: Structural Dynamics (Primer)• Intro• SDOF• Free and damped vibration• Force Transients• Numerical Solutions (SDOF)• Impulsive ResponseDay 4: Element Response and Element Desgin• Domains of response• PI Diagrams• Damage Levels – concepts• Energy Solutions• SDOF Equivalency• Resistance Functions• Membrane Action• Shear Resistance• Failure modes and progression• Strain Rates• Design Factors• Resistance Functions• Performance Requirements• Deflection as a damage paramter• Detailing to achieve deflection• Design FlowchartDay 5: Modelling and Vulnerability Assessment• Blast Wave Parameters / AT Blast• 3D Blast• Spreadsheet Models (PI Diagrams)• SDOF• CFD• CFD and FEM (Coupled and uncoupled)• Threat Assessment• DBT• Hazards• Risk Assessment• Installation assessment• Software Support• Rules of Thumb• Glazing• Barrier Plans• Progressive Collapse• Student Project Presentations
For further information see Civil and Natural Resources Engineering Head of Department
The assessment for this course will comprise two components – four individual assignments and an in-depth course project. The weighting for each of these components is provided.Assignments must be submitted by 1600 hrs on the due date. The instructor must specifically approve exceptions. All work is, of course, individual work with appropriate citation of sources.
Other References:1. Dusenberry, D.O., Handbook for Blast Resistant Design of Buildings, John Wiley & Sons Inc., USA, 2010/2. Department of Defence, UFC 3-340-01, DoD Design & Analysis of Hardened Structures to Conventional Weapons Effects, USA, 2002 (Formerly TM5-855-1)3. US Department of Defence Unified Facilities Criteria, 2008. UFC 3-340-02, Structures to Resist the Effects of Accidental Explosions (SupercedesTM5-1300). Washington, USA.4. Canadian Standards Association, CSA S850-12 Design and assessment of buildings subjected to blast load, Toronto, 2012.5. American Society of Civil Engineering (ASCE), Blast Protection of Buildings (ASCE/SEI 59-11), 2011.6. Krauthammer, T., Modern Protective Structures, CRC Press, USA, 2008. ISBN: 978-0-8247-2526-67. Baker W.E., Cox P.A., Kulesz J.J, and Strehlow R.A. Explosion Hazards and Evaluation. Elsevier, 1983.8. Biggs, J.M., Introduction to Structural Dynamics, McGraw-Hill Book Co., USA, 19649. Department of Defence, UFC 4-010-01, DoD Minimum Anti-terrorism Standards for Buildings, USA. 2003.10. Department of Defence, UFC 4-010-02, DoD Minimum Anti-terrorism Standoff Distances for Buildings, USA, 200311. Krauthammer, T., ????. Blast Effects and Related Threats. Unknown.12. Brode H.L. Numerical Solution of Spherical Blast Waves. Journal of Applied Physics. No. 6, June 1995.13. Crawford, J.E., et al. Retrofit of Reinforced Concrete Structures to Resist Blast Effects. ACI Structural Journal. Vol 94, July/August 1997. pp 371-377.14. Kingery, C.M., and Bulmash, G., Airblast Parameters from TNT Spherical Air Burst and Hemispherical Surface Burst. Technical Report ARBRL-TR-02555, 1984.
This course follows all departmental policies and procedures as stated in the Undergraduate Handbook and as modified this course outline. Please refer to the 2019 CNRE Undergraduate Handbook for all policies and procedures not explicitly listed here, including (but not limited to) the assignment of grades, missed coursework and appeals, use of calculators on tests and exams, special considerations/aegrotats, professional conduct, dishonest practice and plagiarism, and use of CNRE computing facilities.
Domestic fee $1,102.00
International Postgraduate fees
* All fees are inclusive of NZ GST or any equivalent overseas tax, and do not include any programme level discount or additional course-related expenses.
This course will not be offered if fewer than 5 people apply to enrol.
For further information see Civil and Natural Resources Engineering .