Seismic Design of Reinforced Concrete Mat Foundations
Author: Ron Klemencic, Ian S. McFarlane, Neil M. Hawkins, Sissy Nikolaou | Size: 2.01 MB | Format:PDF | Quality:Original preprint | Publisher: NEHRP Consultants Joint Venture, Applied Technology Council (ATC) and the Consortium of Universities for Research in Earthquake Engineering (CUREE) | Year: 2012 | pages: 33
Seismic design of reinforced concrete mat foundations has advanced significantly in the last twenty years. As analytical capabilities have improved, primarily in the form of finite element analysis, the mathematical modeling of these continuous structural elements has led to seemingly more precise designs. Yet, fundamental questions still remain regarding the seismic performance of these thick foundation
systems.
This Technical Brief attempts to address what is known and what is unknown about this subject, so that a structural engineer can proceed with a seismic design in an informed manner. Because many of the parameters associated with a mat foundation design can be highly variable, designs that consider this variability are encouraged.
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SOIL NAILING FIELD INSPECTORS MANUAL -- SOIL NAIL WALLS
Author: Porterfield, J A Cotton, D M Byrne, R J | Size: 5.92 MB | Format:PDF | Quality:Original preprint | Publisher: Golden Associates, Incorporated | Year: 1994 | pages: 115
The purpose of this manual is to provide field inspectors with the knowledge necessary to effectively monitor and document the construction of soil nail retaining walls. The manual provides information useful to both the experienced and inexperienced soil nail inspector. The manual is organized into two main parts: Preconstruction Preparation and Construction Inspection. Checklists are provided throughout the Construction Inspection sections of the manual which summarize key items discussed in the text. The inspector is encouraged to copy the checklists for use during construction. Appendix A contains blank forms that can be used for proper documentation and testing during soil nail wall construction. Appendix B contains examples of completed forms. Construction inspectors and engineers from California, Oregon, Texas, and Washington State departments of transportation contributed to this manual. The International Association of Foundation Drilling also provided input from the industry perspective.
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Geotechnical Engineering Circular No. 3:
Design Guidance: Geotechnical Earthquake Engineering for Highways,
Volume II - Design Examples
Author: Kavazanjian Jr, E Matasovic, N Hadj-Hamou, T Sabatini, P J | Size: 7.82 MB | Format:PDF | Quality:Original preprint | Publisher: GeoSyntec Consultants | Year: 1997 | pages: 182
This document presents a series of five design examples illustrating the principles and methods of geotechnical earthquake engineering and seismic design for highway facilities. These principles and methods are described in Volume I - Design Principles, FHWA-SA-97-076. The examples presented in this volume cover a wide range of problems encountered in geotechnical earthquake engineering practice. The design examples presented in this document include: seismic design of a shallow bridge foundation; seismic design of a driven pile bridge foundation; seismic design of a gravity retaining wall based on results of a detailed seismic hazard analysis; seismic slope stability analysis of a cut slope in soft rock; and liquefaction potential analysis.
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SEISMIC ANALYSIS AND DESIGN OF BRIDGE ABUTMENTS CONSIDERING SLIDING AND ROTATION
Author: Fishman, K Richards, R | Size: 3.69 MB | Format:PDF | Quality:Original preprint | Publisher: National Center for Earthquake Engineering Research | Year: 1997 | pages: 88
In this report, the authors update and extend the coupled equations of motions that appear in the literature. A newly developed fundamental theory on seismic bearing capacity of soils was ued to compute the seismic resistance of bridge abutments and the resisting moment offered by the foundation soil. Also, the equations presented have been extended to consider the case of bridge abutments and load transfer from the bridge decks. Algorithms for predicting permanent deformations were applied to a number of test cases that were modeled in the laboratory. Model bridge abutments were constructed within a seismic testing chamber, and seismic loading was applied to the models via a shaking table. Compared to previous studies described in the literature, the models were unique in the sense that they were not constrained to a particular mode of failure. Failure was possible by sliding, tilting or a combination of both. The mode of failure could be accurately predicted and depended on model parameters and properties of the backfill and foundation soil.
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CENTRIFUGE MODELING OF LATERALLY LOADED BATTERED PILE GROUPS IN SAND
Author: McVay, M C University of Florida, Gainesville Gardner, R ZHANG, L | Size: 6.68 MB | Format:PDF | Quality:Original preprint | Publisher: University of Florida, Gainesville | Year: 1997 | pages: 258
This research is part of an on-going study of the effects of ship impact loads on waterway structures underlain by pile foundations. The objectives of this research are: (1) To modify the existing pile driver and make it capable of driving 3 by 3 and 4 by 4 battered pile groups in flight onto a base plate and achieve fixed head conditions at the pile cap; (2) To instrument each of the piles in both groups to measure shear and axial force and bending moment; (3) To conduct the lateral load tests in samples with relative densities of 36% and 55% and also to test with dead loads equivalent to 20%, 50%, and 80% of the vertical capacity of the model pile group; (4) To analyze the effect of dead load on the lateral capacity at different relative densities; (5) To gather data about the internal force distribution of the pile groups and to investigate the pattern of pile group rotation; and (6) To use measured test data to validate a coupled bridge superstructure-foundation finite-element-code (FLORIDA-PIER).
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Development of a Coupled Bridge Pier and Foundation Finite Element Code
Author: Hoit, M McVay, M Hays, C O | Size: 3.78 MB | Format:PDF | Quality:Original preprint | Publisher: University of Florida, Gainesville | Year: 1998 | pages: 117
The University of Florida, Department of Civil Engineering developed Florida Pier (FLPIER) in conjunction with the Florida Department of Transportation (FDOT), Structures Division. The first official release of the program was version 5.23 in January 1996. A new release (version NT 1.15) is now available which includes many enhancements including mixed prestressing and mild steel reinforcement, nonlinear pier columns and cap, tapered pier columns and cap, equivalent linear stiffness matrix generation and many other features. In addition, the new release is a Windows NT/95 based program including the graphics portions. The program is capable of analyzing an entire bridge substructure (piles, cap and pier) in conjunction with its soil support resulting in a nonlinear coupled foundation analysis. The new release is a step closer to a complete design program, allowing engineers to optimize their structures. The program was designed to allow input to be specified graphically using "designer" variables such as pile spacing, column offsets, number of columns, batter, missing piles and more. The program is distributed freely by the FDOT through their web site. Both the Federal Highway Administration and FDOT have funded efforts to add additional capabilities to enhance the programs. The next FDOT release is expected in November 1998 and will include pier design capabilities. The added features of the current release are summarized and the complete users manual is included in this document.
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THE RESPONSE OF PILES DURING EARTHQUAKES: DYNAMIC SOIL-PILE-SUPERSTRUCTURE INTERACTIONS
Author: Boulanger, R W Kutter, B L Wilson, D W | Size: 5.83 MB | Format:PDF | Quality:Original preprint | Publisher: University of California, Davis | Year: 1998 | pages: 125
The dynamic response of pile foundations in soft clay and liquefiable sand during strong earthquake shaking was evaluated. The research consisted of two major components: (1) a series of dynamic centrifuge tests of pile-supported structures in soft clay and liquefiable sand; and (2) an evaluation of dynamic "beam on a nonlinear Winkler foundation" (BNWF) analysis methods against the centrifuge model results. The dynamic centrifuge modeling techniques were critically evaluated in detail because these tests were among the first performed using the new shaking table on the 9-m radius centrifuge. The results of this evaluation will benefit other current and future projects utilizing the large centrifuge. Several BNWF computer programs were shown to give consistent results for similar idealizations of a physical problem. Two new p-y elements were implemented into the program GeoFEAP. The representation of radiation damping was shown to be important in certain cases, with series radiation damping being technically preferred over parallel radiation damping in such cases. Calculated responses for a single pile in soft clay were in good agreement with the centrifuge data when using series radiation damping and a p-y element with gapping ability. The p-y resistance of liquefied sand was shown to be strongly dependent on relative density and displacement level. Time histories of p-y resistance were obtained by backcalculation techniques for the soft clay and liquefied sand tests. The p-y resistance of liquefied sand shows characteristics that are consistent with the expected stress-strain behavior of liquefied sand, including the effects of relative dentify, dilation, cyclic degradation, and prior displacement history. If a scaling factor approach is used to approximate the effects of liquefaction on p-y resistance, then pseudo-static p-y analyses suggest a scaling factor of about 0.1-0.2 would be appropriate for Dr=35-40% sand and a scaling factor of about 0.25-0.35 would be appropriate for Dr=55-60% sand. It is emphasized that the use of an apparent p-y scaling factor for liquefied sand was shown to be a simplistic approximation to a complex phenomenon, and therefore its use in design requires considerable judgment.
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