Download or read book Drilled Shafts for Bridge Foundations written by and published by . This book was released on 1993 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Drilled Shafts written by Michael W. O'Neill and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Drilled Shafts written by National Highway Institute (U.S.) and published by . This book was released on 1988 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Drilled Shaft Bridge Foundation Design Parameters and Procedures for Bearing in SGC Soils written by William N. Houston and published by . This book was released on 2011 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report provides a simplified method to be used for evaluating the skin friction and tip resistance of axially loaded drilled shafts. A summary of literature and current practice was completed and then a comprehensive set of field and laboratory tests was performed. Several soil samples were collected from different sites from Arizona and surrounding states. Large scale direct shear apparatus was developed and used to determine the friction between soil and concrete. Finite element analyses were conducted on several prototype cases to determine effect of soil parameters such as dilation on the skin friction values. A step-by-step simplified approach was introduced to determine the skin and tip resistance of drilled shaft foundations in gravelly soils. An example application was presented to guide users in utilizing the simplified approach.
Download or read book Drilled Shaft Design and Construction Guidelines Manual Construction procedures and design for axial loading written by Lymon C. Reese and published by . This book was released on 1977 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Drilled Shafts written by Michael W. O'Neill and published by . This book was released on 1999 with total page 758 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Rock socketed Shafts for Highway Structure Foundations written by John P. Turner and published by Transportation Research Board. This book was released on 2006 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Manuals for the Design of Bridge Foundations written by Richard M. Barker and published by Transportation Research Board National Research. This book was released on 1991 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Drilled Shaft Manual Construction procedures and design for axial loading written by Lymon C. Reese and published by . This book was released on 1977 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Design of Short Drilled Shaft Foundations in High plasticity Clay Under Inclined Loading written by Thornchaya Wejrungsikul and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Drilled shaft foundations are primarily used to support structures such as bridge piers, towers, buildings, transmission towers, and roadway median cable barriers. Generally, the main characteristics of drilled shafts are to transfer the loads to the stronger subsoil layers in the vertical direction and also their ability to withstand lateral movements from lateral loads applied. Though the design of shafts is well established with respect to combinations of loads and moments, their behavior under pullout type inclined loading is not well established. The inclined load applied is the combination of lateral and uplift loads applied at the same time and structures such as ends of cable barriers and transmission towers that are supported by the drilled shafts. This dissertation research mainly focuses on the use of drilled shafts supporting at the ends of the cable median barrier systems. These shafts play an important role in protecting the integrity of the cables thereby reducing cross-over collisions at highway medians. Several foundation problems were recorded in north Texas when drilled shafts were used to connect all the cables of the cable barrier systems. During December 2006 to February 2007, several foundation failures of three cable median barrier were observed in Kaufman County near Dallas without any traffic related vehicular impacts (Heady, 2008). Preliminary investigation of foundation failures showed that failed drilled shafts were located in a high plasticity clay environment. Causes of failures are attributed to cold temperature induced shrinkage in the cables that might have significantly increased the tensions in them. Other factors consist of soil saturation from prolonged rainfall events and also potential use of smaller size drilled shafts at the site. In order to fully understand the causes of failures, the present dissertation research was performed. As a part of this research, various sizes of drilled shafts were designed and constructed in a clayey soil environment similar to the one where foundation distress was observed. Geotechnical sampling and laboratory testing were performed and the test results showed different soil layers including high plasticity clayey soil near the ground surface. Soil strength properties for both unsaturated (field condition) and saturated conditions were determined and these results are used in the analysis of field test results to deduce the causes of foundation distress. A new load test setup for the application of an inclined tensile loading on the drilled shaft was designed to simulate the natural field loading condition exerted by the cables. The capacities of different sizes of drilled shafts from field test were tested and measured with this setup and these results showed that the dimensions of reaction test piers and spacings used between reaction and test piers have yielded results that are not influenced by the boundary effects or reaction shaft movements. All load tests were conducted until the foundations reached failure. Test results were analyzed with both uplift capacity and lateral capacity analyses models proposed by many researchers as well as Finite Element Method (FEM) based numerical modeling in understanding the behaviors of drilled shafts under the inclined loading. After obtaining good simulation results, the analytical models are further used for various hypothetical foundation dimensions and for different undrained shear strengths of soils. These test results are used to develop foundation design charts for inclined loading conditions. Both the selection of a specific design chart and its use are explained. Additionally, drilled shaft construction guidelines for cable barrier systems and recommendation for periodic maintenance are provided.
Download or read book Drilled Shaft Design and Construction Guidelines Manual written by Lymon C. Reese and published by . This book was released on 1977 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 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 published by . This book was released on 1977 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamic Characterization of Drilled Shafts Foundations on Doremus Avenue Bridge written by Martina Balic and published by . This book was released on 2010 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic properties of the drilled shaft foundations supporting Doremus Avenue Bridge were determined by forced vibration testing. The main two objectives of the substructure testing at Doremus Avenue Bridge were: (1) site evaluation with respect to the dynamic soil properties, and, (2) shaft evaluation for the purpose of definition of their dynamic stiffness. The site characterization entailed crosshole testing for the purpose of evaluation of the dynamic properties of soil such as shear wave velocity and shear modulus profile. The drilled shaft impedance evaluation was done through forced excitation using an electromagnetic shaker. The responses of the tested shaft, as well as the response of adjacent shafts, were measured for the purpose of evaluation of the shaft interaction. To gain a better insight into the shaft dynamics, one of the shafts was instrumented with five triaxial geophones distributed along the full length of the shaft. The scope and results of the site characterization, shaft impedance and shaft interaction evaluation are presented and discussed in this research.
Download or read book Drilled Shaft Manual Structural analysis and design for lateral loading by written by Lymon C. Reese and published by . This book was released on 1977 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Design Optimization of Drilled Shafts written by Charles C. Armour and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the early twentieth century, the implementation of drilled shafts has transformed the face of foundation design of bridges and buildings (Grader 2012). These major components of foundations began in the 1920’s near the Great Lakes area of Chicago and have been competing with driven pile technique since the 1960’s (Coduto 2001). Currently, drilled shafts are more implemented with major bridge constructions and building projects (Brown 2007). With the popularity of both drilled shafts and driven piles, each come with a set of advantages for each. Drilled shafts appear to be the most cost effective option to operate the equipment necessary for completion, and they give the ability to change the diameter or shaft length to address the unforeseen changes in soil conditions which are be monitored during the drilling process. Drilled shaft processes have demonstrated the ability to penetrate through soils containing cobbles and boulders and thus give the ability to be socketed into bedrock. During the construction process, drilled shafts reduce the high noise level and vibration compared to that with driven piles. Driven piles, however, have some advantages; for example, driven piles allow for consolidation of soils laterally along the pile length and the tip together. This consolidation allows for the increase in the effective stress of the soil, that can increase skin friction and end bearing factors. The driven piles also give redundancy to the foundation system; where drilled shafts may have one massive pile, a driven pile system will have many piles (Coduto 2001). While using the considerations and ideas mentioned previously, the purpose of this study is to use a soil-pile interaction with a non-linear finite element model in connection with an advanced optimization method with which to develop the most economical drilled shaft design. The application of a non-linear finite element model in consideration with an advanced optimization method and various FORTRAN coded soil characterizations has not been determined to be the best economical drilled shaft design. Therefore, this study required a different direction and consideration than was used before. Also, this report does not reflect long-term analysis of drilled shafts. However, a short-term analysis is considered to be the controlling condition. A long-term analysis of the drilled must be completed to determine the critical condition.
Download or read book Contemporary Topics in Deep Foundations written by Magued Iskander and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: GSP 185 contains 80 papers presented at the International Foundation Congress and Equipment Expo held in Orlando, Florida, March 15-19, 2009.
Download or read book ADSC Drilled Shaft Foundation Symposium written by Association of Drilled Shaft Contractors (U.S.) and published by . This book was released on 1998 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
