asce/awea recommended practice for compliance of large...
TRANSCRIPT
ASCE/AWEA Recommended Practice for Compliance of Large-based Wind
Turbine Support Structures Nov 28, 2012
By: Rolando E. Vega, Ph.D., P.E.
Director of Research The University of Texas at San Antonio
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Outline
1. Introduction 2. Past, present and future 3. US Wind Energy Structures Working Group 4. Memorandum of Understanding -AWEA and ASCE 5. Industry statistics and the need for a Roadmap. 6. The RP2011 Outline and Scope. 7. Some unique elements of the RP2011 8. Future Activities
Past, Present and Future
Large Wind Turbine Permitting Guideline Committee
Structural Wind Effects Committee
Wind Energy Structures Subcommittee
Committee name change to: “Large Wind Turbine Compliance Guideline”
AWEA/ASCE Recommended Practice is published
MOU between AWEA/ ASCE
2 groups joined forces
ASCE/ AWEA
Standard
2010
2009
2007 1996
4Q 2011
4Q 2011
2012-2015
AWEA/ASCE Working Group Leaders
Rolando Vega Working Group Chair
ABS
Nestor Agbayani Vice-Chair &
Tower Structure Agbayani Structural
Leonardo Dueñas-Osorio Group Secretary
Rice University
Jim Lockwood Inspection and
Structural Health Monitoring Aerosolutions
Xinguo Cai Referencing and
definitions Glenn Martin
Kevin Smith Survey, Outreach &
permitting DNV
Paul Sgambatti (ASCE) & John Dunlop (AWEA) Staff from umbrella orgs.
Rolando Vega External Load
Conditions ABS
Craig Moller Foundation Structure
GL GH
Paul Veers Committee Chairman
NREL
Memorandum of Understanding On December 9, 2011 ASCE and AWEA inked the agreement to continue cooperation for standardization of wind energy structures in the ANSI offices in Washington D.C.
Industry statistics I (we) am aware that wind turbines have a separate set of internationally recognized design and safety standards which equal or exceed building codes in our jurisdiction.
I (we) believe a guidance document that explains the inter-relationships of various codes that have been used to design and build a large wind turbine would be useful to all local jurisdictions
I (we) find it difficult to apply our codes and knowledge when needing to make approval decisions for large wind turbines, towers, and foundations.
Objective
• Provide an appropriate minimum level of protection against damage from all hazards during the planned lifetime
• Develop a document that clearly identifies typical and specific U.S. wind turbine design recommendations that are compatible with the International Electrotechnical Commission (IEC) requirements
• Advance permit process consistency nationwide.
Table of Contents (Scope) 1. Introduction 2. Scope of Guideline 3. Terms and definitions 4. Principal Elements of Permitting, Design
and Quality Assurance 5. External Conditions and Loads 6. Materials 7. Tower Support Structures 8. Foundations 9. Fabrication and Installation 10. Inspection and Structural Health
Monitoring • References • Appendix A: Compliance Checklist for
Authorities Having Jurisdiction • Appendix B: Sample Wind Turbine Loads
Document • Appendix C: ASCE 7 vs IEC 61400-1
Wind Velocity Profile comparison
Some unique elements
Download ASCE/AWEA RP2011
Future Activities From 2012-2014, the following is expected:
1. Industry’s wide use of the RP2011. 2. Committees in ACI, AISC and ASCE (and others) consider the needed
research outlined in RP2011. 3. Faculty and Researchers within the industry address the needed research
by publishing technical notes to address reliability of e.g. concrete fatigue, anchorage for high-cycle connections, fabrication tolerance for large steel cylinders, safety factor calibration, etc.
4. ASCE/AWEA Wind Energy Structures committee should help direct national research with above associations.
5. US should engage and help direct IEC efforts, as appropriate, for potential standardization efforts of wind energy support structures.
If development of an IEC standard for support structures is stagnated, the American Society of Civil Engineers (ASCE) and American Wind Energy Association (AWEA) may initiate standardization efforts.
Use ASCE 7 reference standard list EXAMPLES FROM
INDUSTRY:
Petroleum industry: API 650 standard is used for oil storage
tank design.
Waterworks Industry: AWWA D100 standard is used for water tank
design.
Logically, a specialty standard for wind turbine support
structures is the next step?
For further questions Please contact: Rolando E. Vega, Ph.D., P.E., M.ASCE Working Group Chair Director of Research The University of Texas at San Antonio Tel.: 210-458-8654 Cell: 210-848-6862 [email protected] Or Nestor Agbayani, S.E., M.ASCE Principal Engineer Agbayani Structural Engineering Tel.: 661-742-1327 [email protected]
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AGBAYANI