Load And Resistance Factor Design Lrfd Resistance Factors For Tip Grouted Drilled Shafts

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Load And Resistance Factor Design Lrfd Resistance Factors For Tip Grouted Drilled Shafts

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Author :
language : en
Publisher:
Release Date : 2019

Load And Resistance Factor Design Lrfd Resistance Factors For Tip Grouted Drilled Shafts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Bearing capacity categories.

University of South Florida researchers established Load and Resistance Factor Design (LRFD) resistance factors for postgrouted end bearing drilled shaft piles.

Load And Resistance Factor Design Of Drilled Shafts Subjected To Lateral Loading At Service Limit State

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Author : Minh Dinh Uong
language : en
Publisher:
Release Date : 2018

Load And Resistance Factor Design Of Drilled Shafts Subjected To Lateral Loading At Service Limit State written by Minh Dinh Uong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.

Since 2007, the American Association of State Highway Administration Officials (AASHTO) has made utilization of Load and Resistance Factor Design (LRFD) mandatory on all federally-funded new bridge projects (AASHTO, 2007). However, currently, there are no guidelines implementing LRFD techniques for design of drilled shaft subjected to lateral loads using reliability-based analysis. On a national level, the AASHTO LRFD Bridge Design Specifications (AASHTO, 2012) specify that a resistance factor of 1.0 be used for design of drilled shafts subjected to lateral loading at service limit state, which means reliability-based analyses for calibration of resistance factors have not been performed. Therefore, there is a need to create a LRFD procedure for drilled shafts subjected to lateral loading at service limit state that has reliability-based calibrated resistance factors applicable for future projects. The research focuses on the reliability-based analysis of drilled shaft subjected to lateral loading, characterize lateral load transfer model of drilled shafts in shale, probabilistic calibrate resistance factor and contribute to the development of design procedure using LRFD. The objective of this work is to improve the design of drilled shaft subjected to lateral loading using LRFD at service limit state by providing a more reliable design procedure than the current AASHTO LRFD procedure for drilled shafts subjected to lateral loading at service limit state.

Load And Resistance Factor Design Of Drilled Shafts In Shale Using Standard Penetration Test And Texas Cone Penetration Test Measurements

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Author : Mark Daniel Pierce
language : en
Publisher:
Release Date : 2013

Load And Resistance Factor Design Of Drilled Shafts In Shale Using Standard Penetration Test And Texas Cone Penetration Test Measurements written by Mark Daniel Pierce and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Electronic dissertations categories.

Missouri Department of Transportation (MoDOT) designers currently follow American Association of State Highway and Transportation Officials (AASHTO) design methods for design of drilled shafts in shale and other weak rock. These methods are generally based on Load and Resistance Factor Design (LRFD) methods that relate uniaxial compressive strength measurements of rock cores to the side and tip resistance for drilled shafts. However, shale and other weak rock can be notoriously difficult to effectively sample and test, which poses practical problems for those tasked with designing drilled shafts in such materials. The difficulty in sampling shale has lead geotechnical engineers to consider in-situ tests, such as the Standard Penetration Test (SPT) and the Texas Cone Penetration test (TCP), as surrogates for conventional coring and laboratory testing. In order to utilize results of in-situ tests for design of drilled shafts using Load and Resistance Factor Design (LRFD), it is necessary to correlate in-situ test measurements with side and tip resistance and to establish calibrated resistance factors that account for the reliability of the correlations and the in-situ test measurements. This thesis describes efforts undertaken to develop improved correlations among in-situ test measurements and drilled shaft capacity and to develop resistance factors that produce established target reliabilities for different classes of roadways.

Calibration Of Resistance Factors For Drilled Shafts For The New Fhwa Design Method

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Author : Murad Yusuf Abu-Farsakh
language : en
Publisher:
Release Date : 2013

Calibration Of Resistance Factors For Drilled Shafts For The New Fhwa Design Method written by Murad Yusuf Abu-Farsakh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Load factor design categories.

As a continuing effort to implement the Load and Resistance Factor Design (LRFD) design methodology for deep foundations in Louisiana, this report will present the reliability-based analyses for the calibration of the resistance factor for LRFD design of axially loaded drilled shafts using Brown et al. method (2010 FHWA design method). Twenty-six drilled shaft tests collected from previous research (LTRC Final Report 449) and eight new drilled shaft tests were selected for statistical reliability analysis; the predictions of total, side, and tip resistance versus settlement behavior of drilled shafts were established from soil borings using both 1999 FHWA design method (Brown et al. method) and 2010 FHWA design method (O'Neill and Reese method). The measured drilled shaft axial nominal resistance was determined from either the Osterberg cell (O-cell) test or the conventional top-down static load test. For the 30 drilled shafts that were tested using O-cells, the tip and side resistances were deduced separately from test results. Statistical analyses were performed to compare the predicted total , tip, and side drilled shaft nominal axial resistance with the corresponding measured nominal resistance.

Load And Resistance Factor Design Of Drilled Shafts At The Service Limit State

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Author : Thanh Thuy Vu (Engineer)
language : en
Publisher:
Release Date : 2013

Load And Resistance Factor Design Of Drilled Shafts At The Service Limit State written by Thanh Thuy Vu (Engineer) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Electronic dissertations categories.

A practical and efficient procedure for evaluation of drilled shafts at the service limit state is proposed. The procedure uses Load and Resistance Factor Design (LRFD) concepts to achieve target probabilities of failure without requiring case-specific probabilistic analyses. Proposed resistance factors are primarily dependent on four parameters: the normalized load, the coefficient of variation of the geomaterial strength, the target probability of failure, and the shaft length-to-diameter ratio. The proposed procedure can be implemented using several charts or analytical equations provided.

Development Of Preliminary Load And Resistance Factor Design Of Drilled Shafts In Iowa

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Author : Kam W. Ng
language : en
Publisher:
Release Date : 2014

Development Of Preliminary Load And Resistance Factor Design Of Drilled Shafts In Iowa written by Kam W. Ng and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Bridges categories.

The Federal Highway Administration (FHWA) mandated utilizing the Load and Resistance Factor Design (LRFD) approach for all new bridges initiated in the United States after October 1, 2007. To achieve part of this goal, a database for Drilled Shaft Foundation Testing (DSHAFT) was developed and reported on by Garder, Ng, Sritharan, and Roling in 2012. DSHAFT is aimed at assimilating high-quality drilled shaft test data from Iowa and the surrounding regions. DSHAFT is currently housed on a project website (http://srg.cce.iastate.edu/dshaft) and contains data for 41 drilled shaft tests. The objective of this research was to utilize the DSHAFT database and develop a regional LRFD procedure for drilled shafts in Iowa with preliminary resistance factors using a probability-based reliability theory. This was done by examining current design and construction practices used by the Iowa Department of Transportation (DOT) as well as recommendations given in the American Association of State Highway and Transportation Officials (AASHTO) LRFD Bridge Design Specifications and the FHWA drilled shaft guidelines. Various analytical methods were used to estimate side resistance and end bearing of drilled shafts in clay, sand, intermediate geomaterial (IGM), and rock. Since most of the load test results obtained from O-cell do not pass the 1-in. top displacement criterion used by the Iowa DOT and the 5% of shaft diameter for top displacement criterion recommended by AASHTO, three improved procedures are proposed to generate and extend equivalent top load-displacement curves that enable the quantification of measured resistances corresponding to the displacement criteria. Using the estimated and measured resistances, regional resistance factors were calibrated following the AASHTO LRFD framework and adjusted to resolve any anomalies observed among the factors. To illustrate the potential and successful use of drilled shafts in Iowa, the design procedures of drilled shaft foundations were demonstrated and the advantages of drilled shafts over driven piles were addressed in two case studies.

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.

Load And Resistance Factor Design Of Drilled Shafts In Shale For Lateral Loading

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Author : Andrew Boeckmann
language : en
Publisher:
Release Date : 2014

Load And Resistance Factor Design Of Drilled Shafts In Shale For Lateral Loading written by Andrew Boeckmann and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Bridges categories.

A research project involving 32 drilled shaft load tests was undertaken to establish LRFD procedures for design of drilled shafts subjected to lateral loads. Tests were performed at two Missouri Department of Transportation (MoDOT) geotechnical research sites. All shafts were founded in shale. Shafts were instrumented to measure the displacement of the shaft head, and the structural response of each shaft was interpreted from strain gage data as well as from ShapeAccelArray (SAA) data. The load tests achieved significant displacement of the top of the shaft, and successfully transferred load into the rock layers.

Calibration Of Resistance Factors Needed In The Lrfd Design Of Drilled Shafts

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Author : Alicia Rae Fortier
language : en
Publisher:
Release Date : 2016

Calibration Of Resistance Factors Needed In The Lrfd Design Of Drilled Shafts written by Alicia Rae Fortier and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.

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.