Member $99.00 | Non-Member $349.00
INSTRUCTOR: Jerry A. DiMaggio, P.E., D.GE, M.ASCE
Sponsored by ASCE Continuing Education and ASCE's Geo-Institute.
The webinar allows the audience to see this webinar straight from my office, without having to travel. I have attended many ASCE webinars and find that ASCE knows how to put together an effective webinar. - Anonymous Attendee
Purpose and Background
Driven pile foundations are the most common deep foundation type used in the United States. Similar to other civil engineering and heavy construction features the importance of construction monitoring and inspection is a key component to project success and can’t be separated from design. This webinar is intended to equip project team members with the knowledge and confidence to satisfy the needs of today’s driven pile projects regardless of their size or complexity. The importance and complexity of driven pile construction monitoring has increased as the design loads, performance requirements, size of driven piles (length and diameter) and complexity of driving systems continue to increase and change.
Design ( ASD ) theories for driven piles assume “good” construction practices. Often “off-the-shelf” construction specifications are used that may not be consistent with the design assumptions and site conditions, e.g., specifications that were originally developed based on Allowable Stress Design (ASD) that may be used for projects that now use LRFD procedures. In the ASD specifications the effect of various uncertainties was addressed by a single factor of safety regardless of the design method. However, in the LRFD approach the structural and geotechnical uncertainties are dealt with separately. Within the structural and geotechnical aspects, different resistance factors are used to address various limit states such as geotechnical side resistance, geotechnical tip resistance, structural flexure resistance, and structural shear resistance. This approach necessitates a fresh look at construction practices with respect to the various limit states. For example, what happens to the structural integrity of a driven pile when excessive stresses occur during installation? Or what happens to the geotechnical and structural resistance of the pile when excessive blow counts prevent required pile penetration? Common practice is not to consider such issues and many designers and agencies use modified pre-LRFD construction specifications and consider these specifications to be LRFD-compliant. Such practice can lead to an erroneous conclusion that the installed driven piles are consistent with the design assumptions. Furthermore, such usage can have legal implications in terms of liability from a designer (structural or geotechnical) and contractor viewpoint.
A key assumption is that participants understand the currently recommended (perhaps not applied) protocol for Quality Control (QC) and Quality Assurance (QA) which is typically not applied properly in the LRFD context. The constructability-based LRFD webinar series will focus on the coordination and communication necessary between various members of the project team to construct geotechnical features that are consistent with LRFD procedures. The webinar series will be applicable to various project delivery methods, e.g., design-bid-build, design build, construction manager at risk, etc.). In addition the webinar series will also present an integrated constructability-based approach in an LRFD context from a geotechnical and structural viewpoint.
Primary Discussion Topics
- Basic concepts of driven pile design from the viewpoint of the LRFD approach
- Overview of driven pile construction processes
- Construction monitoring and inspection (QC and QA)
- Need for and evaluation of structural integrity
- Effect of construction methods on design assumptions and vice versa
Learning Outcomes
- Understand the basics of LRFD as related to construction practices for driven piles
- Discuss and contrast typical construction processes
- Review key aspects of LRFD design and construction specifications and tolerances
- Understand the important aspects of driven pile construction monitoring and inspection with respect to design assumptions
- Summarize the evaluation and use of load and integrity testing procedures
Webinar Benefits
- Increase your knowledge, ability and confidence with respect to the construction, monitoring and inspection of driven piles designed by use of the LRFD approach.
- Understand how to interpret driven pile plans, specifications and special notes
- Learn how to avoid driven pile contract disputes during construction
- Achieve improved communication between the design and construction members of the project team
Intended Audience
- Owners
- General and specialty contractors
- Structural and geotechnical specialists
- Generalist civil engineers
- Construction engineers, inspectors, and superintendents
- Material suppliers for driven pile projects
- Project managers
Webinar Outline
- Basic terminology and design concepts of the LRFD approach for driven piles
- Overview of installation techniques and approach
- Integrity and load testing
- Roles and responsibilities during the construction phase
- Plans and specifications
- Construction and design tolerances and compliance
- Tips for successful design and construction of driven piles consistent with LRFD
- References and Closure