Download or read book Dynamic Passive Pressure on Abutments and Pile Caps written by and published by . This book was released on 2010 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Passive Force deflection Behavior for Abutments with MSE Confined Approach Fills written by Kyle M. Rollins and published by . This book was released on 2010 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Approach fills behind bridge abutments are commonly supported by wrap-around mechanically stabilized earth (MSE) walls; however the effect of this geometry on passive force development is unknown. This report describes the first large-scale tests to evaluate passive force-deflection curves for abutments with MSE wingwalls. A test was also performed with fill extending beyond the edge of the abutment wall for comparison. The abutment wall was simulated with a pile supported cap 5.5 ft high, 11 ft wide, and 15 ft long in the direction of loading. The backfill behind the pile cap consisted of clean sand compacted to 96% of the modified Proctor maximum density. As the pile cap was loaded laterally, pressure on the MSE wall led to pull-out of the steel reinforcing grids and the MSE wall panels moved outward about 2% of the wall height when the ultimate passive force developed. Despite pullout, the passive force per effective width was 28 kips/ft for the pile cap with MSE wingwalls compared to 22.5 kips/ft for the cap without wingwalls. Nevertheless, the passive force with the MSE wingwalls was still only 76% of the resistance provided by the cap with fill extending beyond the edges. The pile cap with MSE walls required greater movement to reach the ultimate passive force (deflection of 4.2% of wall height vs. 3%). The Caltrans method provided good agreement with the measured passive resistance while the log spiral method required the use of a higher plane strain friction angle to provide reasonable agreement.

Download or read book Large Scale Passive Force displacement and Dynamic Earth Pressure Experiments and Simulations written by Patrick Richard Wilson and published by . This book was released on 2009 with total page 361 pages. Available in PDF, EPUB and Kindle. Book excerpt: During strong earthquakes, foundation structures such as bridge abutments and pile caps mobilize resistance due to passive earth pressure. Dynamic earth pressure can also increase the demand placed on retaining walls during earthquake excitation. Current uncertainty in the passive earth pressure load-displacement behavior and the evaluation of dynamic earth pressure during earthquake excitation motivates the large scale experimental and numerical investigation presented in this dissertation. In the experimental investigations, a 2.15 m high, 5.6 m long, and 2.9 m wide dense, well-graded silty sand backfill is constructed behind a stiff vertical concrete wall inside a large soil container. First, the passive earth pressure load-displacement curve is recorded in two tests. From those tests, the peak passive resistance compares well with the theoretical predictions. Using the test data, a calibrated finite element (FE) model is employed to produce additional load-displacement curves for a wider range of practical applications. A spring model is also developed for representing the passive resistance in dynamic simulations. Next, dynamic earth pressure is measured in 26 events, as the soil container-wall-backfill configuration is subjected to shake table excitations. With peak input accelerations up to about 0.6 g, the earth pressure resultant force remains close to the static level. Small wall movements coupled with the high backfill stiffness and strength contribute to this favorable response. At higher input acceleration levels, the backfill shear strength is further mobilized, resulting in significant dynamic earth pressure increases. FE simulations support and demonstrate the experimental observations. Results show that accurate consideration of the retaining wall-backfill interaction may result in more realistic dynamic earth pressure predictions than the simplified analytical methods which are currently used in design. The unique combination of laboratory and large scale test data reveals interesting features regarding backfill soil shear strength. For instance, although the tested backfill soil had only 7% silty fines, cohesion contributed significantly to the passive resistance and helped to limit dynamic earth pressure. The backfill friction angle in the plane strain test configuration was also found to be relatively high, contributing favorably to the response under both passive and dynamic earth pressure loading.

Download or read book Laterally Loaded Pile Cap Connections written by Kyle M. Rollins and published by . This book was released on 2010 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Lateral Pile Cap Load Tests with Gravel Backfill of Limited Width written by Kyle M. Rollins and published by . This book was released on 2010 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study investigated the increase in passive force produced by compacting a dense granular fill adjacent to a pile cap or abutment wall when the surrounding soil is in a relative loose state. Lateral load tests were performed on a pile cap with three backfills to evaluate the static and dynamic behavior. One backfill consisted of loose silty sand while the other two consisted of dense gravel zones 3 ft. (0.91 m) and 6 ft. (1.82 m) wide between the pile cap and the loose silty sand. The 3 ft. and 6 ft. wide dense gravel zones increased the lateral resistance by 75% to 150% and 150% to 225%, respectively, relative to the loose silty sand backfill. Despite being thin relative to the overall shear length, the 3 ft. and 6 ft. wide gravel zones increased lateral resistance to 59% and 83%, respectively, of the resistance that would be provided by a backfill entirely composed of dense gravel. The dynamic stiffness for the pile cap with the gravel zone decreased about 10% after 15 cycles of loading, while the damping ratio remained relatively constant with cycling. Dynamic stiffness increased by about 10% to 40% at higher deflections, while the damping ratio decreased from an initial value of about 0.30 to around 0.26 at higher deflections.

Download or read book Numerical Analysis of Dense Narrow Backfills for Increased Passive Resistance written by Kyle L. Rollins and published by . This book was released on 2010 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Full scale Effects of Passive Earth Pressure on the Lateral Resistance of Pile Caps written by Ryan Thomas Cole and published by . This book was released on 2003 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Report of Research on Resistance of Pile Caps and Integral Abutments to Lateral Loading written by Robert L. Mokwa and published by . This book was released on 1998 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Concrete International written by and published by . This book was released on 2001 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Seismic Analysis of Retaining Walls Buried Structures Embankments and Integral Abutments written by and published by . This book was released on 2005 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the Third National Seismic Conference and Workshop on Bridges and Highways written by Roland Nimis and published by . This book was released on 2002 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Improved Seismic Design Criteria for California Bridges written by Applied Technology Council and published by . This book was released on 1996 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pile Design and Construction Practice written by Willis H. Thomas and published by CRC Press. This book was released on 2007-12-06 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt: This international handbook is essential for geotechnical engineers and engineering geologists responsible for designing and constructing piled foundations. It explains general principles and practice and details current types of pile, piling equipment and methods. It includes calculations of the resistance of piles to compressive loads, pile group

Download or read book Seismic Design Criteria for Bridges and Other Highway Structures written by Christopher Rojahn and published by . This book was released on 1997 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the Fourth Caltrans Seismic Research Workshop written by and published by . This book was released on 1996 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technical Report written by and published by . This book was released on 1997 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Seismic Performance and Simulation of Pile Foundations in Liquefied and Laterally Spreading Ground written by Ross W. Boulanger and published by . This book was released on 2006 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of a workshop on Seismic Performance and Simulation of Pile Foundations in Liquefied and Laterally Spreading Ground, held in Davis, California, March 16-18, 2005. Sponsored by the Pacific Earthquake Engineering Research Center; University of California at Berkeley; Center for Urban Earthquake Engineering; Tokyo Institute of Technology; Geo-Institute of ASCE. This collection contains 25 papers that discuss physical measurements and observations from earthquake case histories, field tests in blast-liquefied ground, dynamic centrifuge model studies, and large-scale shaking table studies. Papers contain recent findings on fundamental soil-pile interaction mechanisms, numerical analysis methods, and reviews and evaluations of existing and emerging design methodologies. This proceeding provides comprehensive coverage of a major issue in earthquake engineering practice and hazard mitigation efforts.