Title:
Optimized Structural Design of Concrete Pile Plug in Steel Pipe Piles
Author(s):
Lin Wan-Wendner, Ioan Pop, and Werner Vits
Publication:
Structural Journal
Volume:
119
Issue:
6
Appears on pages(s):
153-163
Keywords:
asymmetric reinforcement; concrete plug; structural design; sustainability
DOI:
10.14359/51734802
Date:
11/1/2022
Abstract:
Concrete pile plugs are generally used in marine structures to
transfer loads between steel piles and top concrete structures. This paper looks at the key aspects for structural analysis of concrete plugs including bond stress with steel pile, plug length, reinforcement design, and with prestressed strands. It is proposed to use an asymmetric reinforcement layout based on the loading conditions to reduce material use and subsequent green gas emissions. This may be combined with the strut-and-tie method for local analysis when prestressed strands or tie rods are present. The design methods are carried out in a typical quay wall project and the consequent economic and environmental impact is analyzed. The optimized strategy ensures a safe and sustainable pile plug design. For the investigated quay wall project, it is found that using asymmetric reinforcement leads to an overall 50% reduction on steel quantity, associated cost, and CO2 emissions. Quantitatively, the saved steel corresponds to $380,000 effective material costs as of 2021, and consequently 515 tonnes (268 US tons) of CO2 emission for equivalent steel production.
Related References:
1. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary (ACI 318R-14),” American Concrete Institute, Farmington Hills, MI, 2014, 520 pp.
2. EN 1992-1-1:2004, “Eurocode 2: Design of Concrete Structures – Part 1-1: General Rules and Rules for Buildings,” European Committee for Standardization, Brussels, Belgium, 2004, 227 pp.
3. National Building Code of Canada, “Canadian Commission on Building and Fire Codes,” National Research Council of Canada, Ottawa, ON, Canada, 2015.
4. EN 1994-1-1:2004 “Eurocode 4: Design of Composite Steel and Concrete Structures – Part 1-1: General Rules and Rules for Buildings,” European Committee for Standardization, Brussels, Belgium, 2004.
5. API RP2A-LRFD, “Planning, Designing and Constructing Fixed Offshore Platforms-Load and Resistance Factor Design,” American Petroleum Institute, Washington, DC, 2019.
6. BS 5400, “Code of Practice for Design of Composite Bridges,” British Standards Institution (BSI), London UK, 1999, 29 pp.
7. Belfroid, S., “Analysis of Pile-Concrete connections in Near-Shore Applications,” master’s thesis, Delft University of Technology, Delft, the Netherlands, 2015.
8. API RP2A-WSD, “Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms – Working Stress Design,” American Petroleum Institute, Washington, DC, 2000.
9. Lotsberg, I.; Serednicki, A.; Bertnes, H.; and Lervik, A., Design of Grouted Connections for Monopile Offshore Structures. Stahlbau 81, Ernst & Sohn, Berlin Germany, 2012, pp. 695-704.
10. DNV-OS-J101, “Design of Offshore Wind Turbine Structures,” Det Norske Veritas (DNV), Offshore Standard, 2013.
11. ACI CT-13, “ACI Concrete Terminology – An ACI Standard,” American Concrete Institute, Farmington Hills, MI, 2013.
12. CSA A23.3:19, “Design of Concrete Structures,” CSA Group, Toronto, ON, Canada, 2019.
13. Jirsa, J. O., and Breen, J. E., “Influence of Casting Position and Shear on Development and Splice Length—Design Recommendations,” Research Report 242-3F, Center for Transportation Research, Bureau of Engineering Research, University of Texas at Austin, Austin, TX, 1981.
14. Jeanty, P. R.; Mitchell, D.; and Mirza, M. S., “Investigation of Top Bar Effects in Beams,” ACI Structural Journal, V. 85, No. 3, May-June 1988, pp. 251-257.
15. World Steel Association, “Steel’s Contribution to a Low Carbon Future and Climate Resilient Societies,”Brussels, Belgium, 2020.
16. fib Bulletin No. 71, “Integrated Life Cycle Assessment of Concrete Structures,” Fédération Internationale du Béton, CEB-FIP, Lausanne, Switzerland, 2013.
17. Price History Tables and Charts in USA, China, Western Europe, and World Export, Steel Benchmarker, Report #368, Steel Benchmarker TM, 2021.