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Author: Aaron S. Budge Publisher: ISBN: Category : Bridges Languages : en Pages : 294
Book Description
Driven piles are the most common foundation solution used in bridge construction across the U.S. Their use is challenged by the ability to reliably verify the capacity and the integrity of the installed element in the ground. Dynamic analyses of driven piles are methods attempting to obtain the static capacity of a pile, utilizing its behavior during driving. Dynamic equations (a.k.a. pile driving formulas) are the earliest and simplest forms of dynamic analyses. Mn/DOT uses its own pile driving formula; however, its validity and accuracy has not been evaluated. With the implementation of Load Resistance Factor Design (LRFD) in Minnesota in 2005, and its mandated use by the Federal Highway Administration (FHWA) in 2007, the resistance factor associated with the use of the Mn/DOT driving formula needed to be calibrated and established. The resistance factor was established via the following steps: (i) establishing the Mn/DOT foundation design and construction state of practice, (ii) assembling large datasets of tested deep foundations that match the state of practice established in the foregoing stage, (iii) establishing the uncertainty of the investigated equation utilizing the bias, being the ratio of the measured to calculated pile capacities for the database case histories, (v) calculating the LRFD resistance factor utilizing the method's uncertainty established in step (iv) given load distribution and target reliability. The research was expanded to include four additional dynamic formulas and the development of an alternative dynamic formula tailored for the Mn/DOT practices.
Author: Aaron S. Budge Publisher: ISBN: Category : Bridges Languages : en Pages : 294
Book Description
Driven piles are the most common foundation solution used in bridge construction across the U.S. Their use is challenged by the ability to reliably verify the capacity and the integrity of the installed element in the ground. Dynamic analyses of driven piles are methods attempting to obtain the static capacity of a pile, utilizing its behavior during driving. Dynamic equations (a.k.a. pile driving formulas) are the earliest and simplest forms of dynamic analyses. Mn/DOT uses its own pile driving formula; however, its validity and accuracy has not been evaluated. With the implementation of Load Resistance Factor Design (LRFD) in Minnesota in 2005, and its mandated use by the Federal Highway Administration (FHWA) in 2007, the resistance factor associated with the use of the Mn/DOT driving formula needed to be calibrated and established. The resistance factor was established via the following steps: (i) establishing the Mn/DOT foundation design and construction state of practice, (ii) assembling large datasets of tested deep foundations that match the state of practice established in the foregoing stage, (iii) establishing the uncertainty of the investigated equation utilizing the bias, being the ratio of the measured to calculated pile capacities for the database case histories, (v) calculating the LRFD resistance factor utilizing the method's uncertainty established in step (iv) given load distribution and target reliability. The research was expanded to include four additional dynamic formulas and the development of an alternative dynamic formula tailored for the Mn/DOT practices.
Author: Dan A. Brown Publisher: Transportation Research Board ISBN: 0309143357 Category : Technology & Engineering Languages : en Pages : 518
Book Description
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 418: Developing Production Pile Driving Criteria from Test Pile Data provides information on the current practices used by state transportation agencies to develop pile driving criteria, with special attention paid to the use of test pile data in the process.
Author: Chong Tang Publisher: CRC Press ISBN: 0429658397 Category : Technology & Engineering Languages : en Pages : 589
Book Description
Model Uncertainties in Foundation Design is unique in the compilation of the largest and the most diverse load test databases to date, covering many foundation types (shallow foundations, spudcans, driven piles, drilled shafts, rock sockets and helical piles) and a wide range of ground conditions (soil to soft rock). All databases with names prefixed by NUS are available upon request. This book presents a comprehensive evaluation of the model factor mean (bias) and coefficient of variation (COV) for ultimate and serviceability limit state based on these databases. These statistics can be used directly for AASHTO LRFD calibration. Besides load test databases, performance databases for other geo-structures and their model factor statistics are provided. Based on this extensive literature survey, a practical three-tier scheme for classifying the model uncertainty of geo-structures according to the model factor mean and COV is proposed. This empirically grounded scheme can underpin the calibration of resistance factors as a function of the degree of understanding – a concept already adopted in the Canadian Highway Bridge Design Code and being considered for the new draft for Eurocode 7 Part 1 (EN 1997-1:202x). The helical pile research in Chapter 7 was recognised by the 2020 ASCE Norman Medal.
Author: Willis H. Thomas Publisher: CRC Press ISBN: 0203964292 Category : Technology & Engineering Languages : en Pages : 566
Book Description
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
Author: Ken Skorseth Publisher: ISBN: Category : Gravel roads Languages : en Pages : 112
Book Description
The purpose of this manual is to provide clear and helpful information for maintaining gravel roads. Very little technical help is available to small agencies that are responsible for managing these roads. Gravel road maintenance has traditionally been "more of an art than a science" and very few formal standards exist. This manual contains guidelines to help answer the questions that arise concerning gravel road maintenance such as: What is enough surface crown? What is too much? What causes corrugation? The information is as nontechnical as possible without sacrificing clear guidelines and instructions on how to do the job right.
Author: Samuel G. Paikowsky Publisher: Transportation Research Board ISBN: 0309087961 Category : Bridges Languages : en Pages : 87
Book Description
Introduction and research approach -- Findings -- Interpretation, appraisal, and applications -- Conclusions and suggested research -- Bibliography -- Appendixes.
Author: Aaron S. Budge
Author: Aaron S. Budge
Author: Dan A. Brown
Author: Chong Tang
Author: Tony M. Allen
Author: 
Author: Willis H. Thomas
Author: Ken Skorseth
Author: Samuel G. Paikowsky
Author: 
Author: