Base Resistance Of Drilled Shafts In Rock
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Base Resistance Of Drilled Shafts In Rock
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Author : Stetson B. Ramey
language : en
Publisher:
Release Date : 2009
Base Resistance Of Drilled Shafts In Rock written by Stetson B. Ramey and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Boring categories.
A method is presented to calculate the nominal base resistance of a drilled shaft socketed into a fractured rock mass by using the Hoek-Brown strength criterion and its input parameter the Geological Strength Index (GSI). Base resistance is sometimes neglected when designing drilled shafts embedded in fractured rock masses resulting in large diameter shafts because the entire load is designed to be resisted through side shear. While a fractured rock mass will not have as much bearing capacity as an intact rock mass, usually even a fractured rock mass is able to resist a significant portion of the applied load. Data from load tests on drilled shafts embedded into various types of rock are compared to the theoretical relationship between the GSI and nominal base resistance. The data were all from sources where the drilled shaft was loaded to failure in end bearing and the nominal bearing resistance had been determined. The sources also include necessary rock mass properties. One case was analyzed with the intent of comparing the actual load test data against the theoretical relationship proposed, so rock core boring was taken with the intent of determining a value for the GSI. This data point matches up extremely well with the theoretical relationship. For the other thirteen data points, a value of GSI was estimated from detailed descriptions of the rock mass found in the geotechnical report and boring logs or GSI was correlated to another rock mass rating system. In these cases, the theoretical relationship appears to yield a lower bound to rock socket base resistance. By comparing actual data to the theoretical relationship presented in this thesis, it is determined that the method is a useful tool to estimate the bearing capacity of a rock mass.
Drilled Shafts In Rock
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Author : Lianyang Zhang
language : en
Publisher: CRC Press
Release Date : 2004-05-15
Drilled Shafts In Rock written by Lianyang Zhang and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004-05-15 with Technology & Engineering categories.
Drilled shafts in rock are widely used as foundations of heavy structures such as highway bridges and tall buildings. Although much has been learned about the analysis and design of drilled shafts in rock, all the major findings are published in the form of reports and articles in technical journals and conference proceedings. This book i
Development Of Recommended Resistance Factors For Drilled Shafts In Weak Rocks Based On O Cell Tests
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Author : Xiaoming Yang (Writer on geotechnical engineering)
language : en
Publisher:
Release Date : 2010
Development Of Recommended Resistance Factors For Drilled Shafts In Weak Rocks Based On O Cell Tests written by Xiaoming Yang (Writer on geotechnical engineering) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Load factor design categories.
From October 1, 2007, the new bridges on federal-aid funded projects are mandated to be designed to meet American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Bridge Design Specifications. LRFD is a simplified form of reliability-based design. By multiplying calibrated factors to load and resistance components, the designed structure will maintain a specific level of reliability (or probability of failure). By concept, the load and resistance factors should be calibrated by large number of test data; however, they are often unavailable in geotechnical engineering. Significant efforts are needed to calibrate load and resistance factors based on test data of good quality. In this study, 26 O-Cell test data were collected from Kansas, Colorado, Missouri, Ohio, and Illinois. Seven methods available in the literature were selected to estimate the load capacities of 25 out of 26 drilled shafts. The "FHWA 0.05D" method was found to yield the closest and conservative predictions of the nominal resistances to the representative values; therefore, it was adopted in this study when calibrating the resistance factors for Strength Limit State design. These test data were analyzed and used to calibrate side and base resistance factors for drilled shafts in weak rock. Resistance factors were calibrated at two different target reliability indices: 2.3 (i.e., failure probability, Pf ~ 1/100) for shafts with greater redundancy and 3.0 (Pf ~ 1/1000) for shafts with less redundancy. Side resistance factors were calibrated from two different datasets of measured resistance: total side resistance and layered unit side resistance. The resistance factors calibrated from layered unit side resistance are considered more reliable, therefore, they are recommended for design. The recommended resistance factors from this study are compared with those in AASHTO specifications. Some of those calibrated resistance factors from this study are considerably lower than those in AASHTO specifications. The main reasons for such lower resistance factors are mainly attributed to the low efficiency of the FHWA design method and the limited quality and number of O-Cell test data. These resistance factors may be improved by increasing the size and the quality of the test data in the future. At present, field load tests on drilled shafts are recommended as an alternative to using lower resistance factors, which will also accumulate more test data for future improvement.
Drilled Shaft Design And Construction Guidelines Manual Construction Procedures And Design For Axial Loading
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Author : Lymon C. Reese
language : en
Publisher:
Release Date : 1977
Drilled Shaft Design And Construction Guidelines Manual Construction Procedures And Design For Axial Loading written by Lymon C. Reese and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Boring categories.
Drilled Shaft Manual Construction Procedures And Design For Axial Loading
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Author : Lymon C. Reese
language : en
Publisher:
Release Date : 1977
Drilled Shaft Manual Construction Procedures And Design For Axial Loading written by Lymon C. Reese and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Shafts (Excavations) categories.
Drilled shafts have been used on a limited scale for many years as an alternative to driven piles in a variety of foundation problems. However, uncertainty about the behavior of the drilled shaft has forestalled widespread adoption. The subject package, by Dr. Lymon C. Reese of the University of Texas, is intended for use by bridge engineers, geotechnical engineers, and builders of pile foundations. The manual contains rational procedures and practical guidelines for the design and construction of drilled shaft foundations. Volume I presents a rational design procedure for drilled shafts under axial loading and includes guidelines on construction methods, inspection, load testing, specifications, and cost estimates. Volume II presents alternative methods for computing the response of the shaft to lateral loading and presents the structural design of the shaft for axial and/or lateral loading.
Rock Socketed Shafts For Highway Structure Foundations
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Author : John P. Turner
language : en
Publisher: Transportation Research Board
Release Date : 2006
Rock Socketed Shafts For Highway Structure Foundations written by John P. Turner and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Bridges categories.
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 360: Rock-Socketed Shafts for Highway Structure Foundations explores current practices pertaining to each step of the design process, along with the limitations; identifies emerging and promising technologies; examines the principal challenges in advancing the state of the practice; and investigates future developments and potential improvements in the use and design of rock-socketed shafts.
Improved Design Economy For Drilled Shafts In Rock
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Author :
language : en
Publisher:
Release Date : 2002
Improved Design Economy For Drilled Shafts In Rock written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Bridges categories.
Drilled Shaft Design And Construction Guidelines Manual Reese L C And Allen J D Structural Analysis And Design For Lateral Loading
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Author : Lymon C. Reese
language : en
Publisher:
Release Date : 1977
Drilled Shaft Design And Construction Guidelines Manual Reese L C And Allen J D Structural Analysis And Design For Lateral Loading written by Lymon C. Reese and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Boring categories.
Drilled Shaft Design And Construction Guidelines Manual
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Author : Lymon C. Reese
language : en
Publisher:
Release Date : 1977
Drilled Shaft Design And Construction Guidelines Manual written by Lymon C. Reese and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with categories.
Drilled Shafts
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Author : National Highway Institute (U.S.)
language : en
Publisher:
Release Date : 1988
Drilled Shafts written by National Highway Institute (U.S.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Earthwork categories.
This document was written as a resource for participants in a short course covering the topic of construction and design of drilled shaft foundations for bridges and other structures. It is the second edition of a Federal Highway Administration workbook on construction and design of drilled shafts. The first edition was written in 1988 (FHWA-SA-HI-88-042). While introductory material from the 1988 edition was retained, the emphasis in this document is on providing relatively comprehensive information for engineers who already have some experience with drilled shaft construction and/or design. The initial chapters cover an overview of the characteristics of drilled shafts, site investigations for drilled shafts (to collect information for both construction and design), and details of drilled shaft construction. These chapters are followed by several chapters on the design of drilled shafts in soil and rock for both axial and lateral loading, with examples. Both allowable stress design and load and resistance factor design principles are addressed. Details of design calculations procedures are provided in the appendices.