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SPTC Seminar Series


June 28, 2019

Title: Double Wedge Model and Design Charts for Displacement-Based Design of Cantilever Retaining Wells

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Presented by: Dr. Amit Prashant, Dean, Research and Development Professor, Civil Engineering, Indian Institute of Technology Gandhinagar

1-Hour PDH Provided

Case studies have reported failure of cantilever retaining walls under earthquake loading due to lack of sufficient understanding on the seismic design of these structures. A displacement-based design methodology for cantilever retaining walls has been developed assuming double wedge formation in the backfill and with due consideration to sliding and rotational failure modes. Experimental investigations show the formation of double wedge with v-shaped rupture planes in the backfill evolving from the heel of wall, wherein practically, the rupture planes may or may not intersect the backface of wall. The double wedge model computes seismic sliding displacements of these walls due to the applied earthquake motion and the tangential downward movement of soil wedge along the rupture planes. To compute residual and peak rotational displacements at the top of wall in a simplified manner, residual and peak displacement factor have been proposed to be multiplied with sliding displacements computed from the model. These factors are determined after analyzing 144 cases of rigorous FE non-linear dynamic analysis. Similar exercise has been performed on wall with shear key by analyzing 64 different cases. To account for uncertainties associated with the effect of earthquake characteristics on deformation response of wall, suitable load factors have been proposed in the realm of displacement-based seismic design using LRFD framework. These load factors depend on the PGA of earthquake under consideration. As a much simpler alternative, design charts and corresponding equations based on double wedge model have been proposed to estimate the required heel-length of wall for the expected seismic ground motion.

For registration visit: https://june-28-prashant-workshop.eventbrite.com

Please feel free to contact Margaret Vennochi regarding questions about the event via email at mvennochi@ou.edu.

Seminar Archive

This archive includes all previous seminars, including PDF presentation files and photos.

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3/16/18 Lessons Learned from Forensic Investigations of Premature Failures and Pavement Rehabilitation Strategies in Texas,  Dar Hao Chen, Ph.D., TxDOT

12/1/17 Performance Evaluation and Mix Design Aspects of Foamed WMA Containing RAP, Manik Barman, Rouzbeh Ghabchi, Amir Arshadi, Musharraf Zaman, Mohammad Ashiqur Rahman, OU

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11/9/17 Chemomechanical behavior of multiphasic porous media: Conception and formulation, Changfu Wei

11/8/17 Climate and Transportation Seminar Series - Consideration of Climate in Prioritizing Bridge Maintenance and Repair, Royce Floyd, OU

6/30/17 Effect of WMA and Anti-Stripping Additives on PPA-Modified Binder, Rouzbeh Ghabchi, Musharraf Zaman, and Shivani Rani, ODOT, OU

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4/6/2016 Field Investigation of Spread Slab Beam Bridge Systems and Development of Design Parameters, Mary Beth Hueste, TAMU

12/13/2015 Swelling Clays in Pavement Applications: Their Characterization and Stabilization using Geosynthetics, Jorge Zornberg, UT

11/16/2015 Modeling of Rutting Using the Unified Disturbed State Concept, Chandrakant Desai, University of Arizona

11/13/2015 Accelerated Bridge Construction University Transportation Center, Atorod Azizinamini, FIU

3/12/2015 Fatigue Performance of Asphalt Pavements Containing RAS and RAP, Musharraf Zaman, Rouzbeh Ghabchi, Manik Barman, OU

12/04/2014 Evolution of AASHTO-based Bridge Design, John Kulicki, Modjeski and Masters, Inc.

7/28/2014  Innovative Road Construction in India, Braj Bhushan Pandey, Indian Institute of Technology

4/24/2014  Important Aspects of Chemical Stabilization of Fine-Grained Soils, Amy Cerato, Gerald Miller, OU

4/16/2014  Long Term Bridge Performance Program – An Update, Ali Maher, School of Engineering, Rutgers University

3/18/2014  Temperature Prediction Model of Flexible Pavement in Taiwan, Yu-Min Su, National Central University