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INSTRUCTOR: Jerry A. DiMaggio, P.E., D.GE, M.ASCE
Sponsored by ASCE Continuing Education and the Geo-Institute (G-I).
Purpose and Background
Until recently, this topic has not been studied in-depth and a suite of programmatic, process and technical challenges must be addressed to minimize costs, risks and liability for owners, designers and constructors.
In many cases, existing structural foundations require rehabilitation and enhancements to meet the performance requirements and loading demands of the new structure. The materials and techniques which may be applied to underpin and enhance the structural and geotechnical resistances of an existing foundation include micropiles, augercast piles, drilled shafts and several ground improvement methods including grouting, and controlled modulus columns. These technologies are at various levels of maturity and knowledge of their use in this application varies significantly in national practice. Many technologies have well developed design, construction and monitoring protocols yet some are new, some are old or not used routinely at a local or regional levels.
The reuse of existing foundations (with or without enhancements) is not applicable for all projects because of geometric constraints, environmental restrictions or current design and performance requirements for the new facility. However, when applicable the time and cost benefits may be significant and can be accomplished with confidence.
The reuse of existing structural foundations, both shallow and deep, is an emerging technical subject which provides significant opportunities (benefits of cost and schedule) as well as risks (compatibility, long term reliability and costs) for the infrastructure owners, designers and civil construction community. This webinar addresses the program, process and project issues associated with the assessment, risk management and rehabilitation (reuse and enhancement) of existing structural foundations (both shallow and deep).
Primary Discussion Topics
- Concept and rationale of structural foundation reuse
- Advantages, disadvantages and limitations of structural foundation reuse
- Developing an understanding of design and construction changes between the time of original design and construction to the present
- Programmatic and process challenges of foundation reuse for owners, designers and contractors
- Technical challenges and knowledge gaps in the current state of the practice and art
- Development of an assessment and technical evaluation approach at a program and project level
- Risk based considerations and mitigation strategies for structural and geotechnical failure modes (limit states)
- Potential solutions and their application to rehabilitate and enhance structural foundations
Learning Outcomes
- Become familiar with concept and rationale of structural foundation reuse
- Understand the advantages, disadvantages, and limitations of structural foundation reuse
- Be able to develop a checklist of design and construction changes between the time of original design and construction to the present for foundation reuse projects
- Understand the risk based considerations and mitigation strategies for structural and geotechnical failure modes (limit states)
- Be able to identify potential solutions and their application to rehabilitate structural foundations at a project level
Webinar Benefits
- Be able to evaluate the potential for reuse of existing structural foundations
- Understand the complexity and risks of foundation reuse for owners, designers and contractors
- Learn about rehabilitation and enhancement technologies which may be applied when exiting structural foundations do not meet new project performance requirements
- Be able to generate report recommendations for projects when structural foundation reuse is being considered
Intended Audience
- Infrastructure owners, both public and private
- Geotechnical specialists
- Structural specialists
- Infrastructure contractors
Webinar Outline
- Introduction and definition of the topic
- Advantages, disadvantages, and limitations of structural foundation reuse
- Understanding design and construction changes between the time of original design and construction to the present
- Programmatic and process challenges of foundation reuse for owners, designers and contractors
- Technical challenges and knowledge gaps in the current state of the practice and art
- Development of an assessment and technical evaluation approach at a program and project level
- Risk based considerations and mitigation strategies for structural and geotechnical failure modes (limit states)
- Potential solutions and their application to rehabilitate structural foundations
- References
- Questions