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View Important System Requirements for viewing this course. Co-sponsored by ASCE Continuing Education and ASCE’S Geo-Institute (GI). “Very informative and beneficial in providing a viewpoint for design of micropile foundations in other than bridge structures.” In January 2009, ASCE initiated a new series of webinars that address the practical implementation of Load and Resistance Factor Design (LRFD) for geotechnical features. The series is broadly divided into two major areas: LRFD Fundamentals and LRFD Applications. The LRFD fundamentals are taught in a two-part webinar that includes discussion on basics of LRFD, loads, load combinations and limit states. The LRFD applications address a number of topics ranging from shallow foundations, deep foundations (drilled shafts, driven piles, and micropiles) and earth retaining structures (cut and fill). Also included among the applications topic is a 90-minute standalone webinar covering subsurface explorations and the testing and application of soil and rock tests. The subsurface exploration material presented in this webinar has application to all other application topics which address a specific type of geotechnical feature. It is assumed that participants enrolling in any of the application focused webinars have a fundamental understanding of the design and construction of geotechnical features. Ideally, the participants should also have taken the initial two-part webinar on LRFD fundamentals. This webinar offering concentrates on micropile foundations. Micropile 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 micropile foundation systems. The webinar will use the American Association of State Highway and Transportation Officials (AASHTO) LRFD Bridge and Structures Specifications as a basis for the technical content. Applicable articles in Section 10.5 and 10.9 of AASHTO LRFD Specifications will be used as a basis of discussion. The webinar will include discussion on the terminology and construction of micropiles, identification of limit states and resistance factors, axial compression and uplift resistance of a single micropile, estimation of grout-ground bond resistance and tip resistance, group efficiency factors for evaluation of axial resistance of micropiles in groups, buckling and lateral stability, lateral resistance of micropiles in groups, evaluation of settlement of micropile groups, concept of cased, uncased and plunge lengths, consideration of extreme event limits state such as scour and seismic events, corrosion and deterioration, and typical structural detailing and design. The webinar will assume that the participant has a basic working knowledge of design and construction of deep foundations. This webinar will help participants analyze and size micropile foundations using the LRFD approach. This webinar should benefit geotechnical and structural specialists as well as general civil engineering designers involved in the analysis and design of micropile foundations. General and specialty deep foundation contractors can 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 micropile foundations.
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