Multi-hazard design is a potentially powerful means to achieve structures that meet the requirement of risk consistency with respect to safety metrics, as well as being synergistic through the use of design features appropriate for one hazard that enhance performance with respect to another hazard. The project develops procedures that utilize optimization methods for achieving designs that are safe and economical under multiple hazards constraints, and supports these procedures with novel tools for accurately determining wind speeds, aerodynamic behavior, storm surge and wave effects due to hurricane winds, and structural response to these hazards.
Objective: To develop by 2014 next-generation methods, tools, and maps to better characterize wind and storm surge hazards to enable performance-based standards for designing structures to resist extreme winds, including hurricanes and tornadoes, and storm surge in a multi-hazard context.
What is the new technical idea? The fundamental new technical idea is to use the capabilities of numerical computation, existing data, and spatial statistics, to develop new procedures and standard provisions that describe wind and storm-surge loads and effects with superior accuracy. An improved description will provide the basis for design approaches that will reduce losses and achieve more efficient structures. This goal requires developing:
What is the research plan? The research plan covers the following:
Pilot Computational Wind Engineering (CWE):
Tornado resilient design:
Storm Surge: methodology for
Lombardo, F.T., Pintar, A., Possolo, A., and Simiu, E., “Meteorological Extremes,” Encyclopedia of Environmetrics (accepted for publication).
Yeo, D.., “Multiple Points-In-Time Estimation of Peak Wind Effects on Structures,” J. Struct. Eng., (accepted for publication).
Yeo, D., “Practical Estimation of Veering Effects on High-Rise Structures: A Database-Assisted Design Approach.” Wind and Structures (accepted.for publication).
Yeo, D. and Jones, N.P., “Aerodynamic Forces Induced by Vertically Oscillating Incoming Flow on a Yawed Horizontal Circular Cylinder.” Journal of Wind Engineering & Industrial Aerodynamics (in press).
Lombardo, F.T. “Improved extreme wind speed estimation for wind engineering applications”. Journal of Wind Engineering & Industrial Aerodynamics, Available online 31 March 2012 (in press).
Simiu, E., Lombardo, F., and Yeo, D., “Ultimate Wind Load Design Gust Speeds in the U.S.” (Discussion), J. Struct. Eng., Vol. 138, No. 5, May 2012, 660-661.
Fu, T.C. et al., “A Proposed Technique for Determining Aerodynamic Pressures on Residential Homes,” Wind and Structures, Vol. 15, No. 1 (2012) 27-41.
Simiu, E. et al., Testing of Residential Homes under Wind Loads. ASCE Natural Hazards Review, Vol. 12, 2011, 166-170.
Yeo, D. and Simiu, E., “High-Rise Reinforced Concrete Structures: Database-Assisted Design for Wind.” J. Struct. Eng., Vol. 137, No. 11, Nov. 2011, 1340-1340.
Yeo, D. and Jones, N.P., “Computational Study on Aerodynamic Mitigation of Wind-Induced, Large-Amplitude Vibrations of Stay Cables with Strakes.” Journal of Wind Engineering & Industrial Aerodynamics, 99(4), pp.389-399, 2011.
Levitan, M.L., Kuligowsli, E.D., Lombardo, F.T., Phan, L.T., and Jorgensen, D.P., Progress Report National Institute of Standards and Technology (NIST); Technical Investigation of the May 22, 2011, Tornado in Joplin, Missouri NISTSP 1139, November 2012.
Levitan, M.L., Phan, L.T., Kuligowsli, E.D., Lombardo, F.T., and Jorgensen, D.P., Investigation Plan, National Institute of Standards and Technology (NIST) Technical Investigation of the Joplin, Missouri, Tornado of May 22, 2011 NIST SP1132, May 2012.
Simiu, E. et al., An Assessment of Methods for Determining Wind Loads, NIST Tech. Note 1738, Feb., 2012.
Yeo, D., Database-Assisted Design for Wind: Multiple Points-in-Time Approach. NIST Tech. Note 1711, National Institute of Standards and Technology, 2011.
Phan, L.T.; Slinn, D.N., Kline, S.W., “Wave Effects on Hurricane Storm Surge Simulation,” accepted for ATC-SEI Advances in Hurricane Engineering — Learning from Our Past, October 24-26, 2012, Miami, Florida.
Yeo, D. and Simiu, E., “Structural Reliability of Tall Buildings under Wind Loads: Estimation of Sampling Errors in the Estimation of the Response.” the 2012 Structures Congress, Chicago, Mar. 29-31, 2012. (Best Poster Award)
Fu, T.C., Aly, A.M., Chowdhury, A.G., Bitsuamlak, G., Yeo, D., and Simiu, E., “Simplified Wind Flow and Aerodynamic Response of Residential Homes: Laboratory and Computational Fluid Dynamics Simulations.” Proceedings of the Forth International Conference on Experimental Vibration Analysis for Civil Engineering Structures, p.193-199, Varenna, Italy, Oct. 3-5, 2011.
Phan, L.T. and Simiu, E.; “Estimation of risk for design of structures exposed to combined effects of hurricane wind speed and storm surge hazards,” ICASP11, Applications of Statistics and Probability in Civil Engineering, Faber, Köhler, and Nishijima (eds), 2011 Taylor & Francis Group, London, ISBN 978-0-415-66986-3.
Standards and Codes:
The ASCE/SEI 7 Standard (Minimum Design Loads on Buildings and Other Structures) is the primary U.S. standard for wind and flood loading on buildings and structures. ASCE/SEI 7 is adopted by reference in the International Building Code (IBC) and the International Residential Code (IRC), which are the model codes used by most jurisdictions in the country that enforce building codes. Therefore, ASCE/SEI 7 is the main emphasis of the standards strategy for this project.
The ASCE/SEI 7 Standard began a a new revision cycle in spring 2012 (next edition will be ASCE/SEI 7-16). NIST will work in collaboration with other experts in the field to develop and submit changes proposals for the standard by 2014 for new wind speed maps and to improve: (1) requirements and procedures for the wind tunnel method; (2) methods for determining wind loads accounting for combined wind and seismic hazards; and (3) handling of joint probabilities of wind speeds and storm surge.
Current standards committee participation by project members include: ASCE/SEI 7 Wind Load Subcommittee (Simiu, distinguished member); ASCE/SEI 7 Subcommittee on Flood Loads (Phan, member); ASCE/SEI 7 Subcommittee on Tsunami Loads (Phan, member); ASCE/SEI 37 Design Loads on Structures During Construction (Simiu, member).; American Nuclear Soc. Standard ANS 2.3, Standard for Estimating Tornado, Hurricane, and Straight Winds (Simiu, member).
Start Date:October 1, 2011
Lead Organizational Unit:el
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