INSTRUCTOR:  Naresh Samtani, Ph.D., P.E., D.GE, F.ASCE 

Sponsored by ASCE Continuing Education and ASCE's Geo-Institute.  

Excellent summary of the topic covered.

Purpose and Background

This webinar concentrates on drilled shaft foundations. Drilled shaft foundations are often a technically sound and cost effective foundation choice where a deep foundation solution is appropriate based on site conditions, applied loads and project schedule and performance requirements. The LRFD platform offers a rational framework for consideration of drilled shaft foundation systems. The webinar will use the American Association of State Highway and Transportation Officials (AASHTO) LRFD Bridge Design Specifications as a basis for the technical content. Applicable articles in Section 10.5 and 10.8 of AASHTO LRFD Specifications will be used as a basis of discussion.

The webinar will include discussion on the terminology and construction of drilled shafts, identification of limit states and resistance factors, development and use of axial resistance charts, concept of mobilized resistance, group efficiency factors for evaluation of axial resistance of shafts in groups, p-multipliers for evaluation of lateral resistance of shafts in groups, redundancy, evaluation of settlement of shaft groups, use of construction point concept, uplift resistance, consideration of extreme event limits state such as scour and seismic events, and typical structural detailing. The webinar will assume that the participant has a basic working knowledge of design and construction of drilled shafts.

Learning Outcomes

This webinar will help participants analyze and size drilled shaft foundations using the LRFD approach.

Webinar Benefits

• Learn basics of LRFD-based analysis of drilled shaft foundations
• Continue building on the knowledge gained from previous LRFD webinars
• Examine the possibilities and benefits of improved communications between geotechnical and structural specialists for drilled shaft foundation design

Intended Audience

This webinar will benefit geotechnical and structural specialists as well as general civil engineering designers involved in the analysis and design of drilled shaft foundations. General and specialty deep foundation contractors will also benefit from the webinar. Basic knowledge of LRFD and geotechnical principles is a prerequisite. The webinar will benefit professionals with 0•25 years of practical experience in analysis/design and construction of drilled shaft foundations.

Webinar Outline

• Terminology and construction
• Failure modes and limit states
• Resistance and resistance factors
• Axial resistance charts
• Lateral resistance
• Extreme events
• Typical structural detailing