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Articles 10141 - 10170 of 13031
Full-Text Articles in Engineering
Shear Plus Bending In Lapped Z-Purlins, Keith Almoney, Thomas M. Murray
Shear Plus Bending In Lapped Z-Purlins, Keith Almoney, Thomas M. Murray
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Six two purlin line, three span continuous Z-purlin tests were conducted to show that combined shear plus bending is a possible failure mode immediately outside the lapped portion of the purlin lines. AISI Specification provisions predicted that combined shear plus bending was the controlling limit state. Strain gage data showed that local buckling occurred immediately outside of the lapped portion of the purlins lines prior to failure which caused moment to redistribute to the positive moment region. It is concluded that shear plus bending is a possible controlling limit state for continuous lapped purlins.
Web Crippling Behaviour Of Cold-Formed Unlipped Channels, Ben Young, Gregory J. Hancock
Web Crippling Behaviour Of Cold-Formed Unlipped Channels, Ben Young, Gregory J. Hancock
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
An experimental investigation of cold-formed unlipped channels subject to web crippling is described. The tests were carried out under four loading conditions according to the AISI Specification, namely End-One-Flange (EOF), Interior-One-Flange (IOF), End-Two-Flange (ETF), and Interior-Two-Flange (ITF) loading. The concentrated load or reaction forces were applied by means of bearing plates which acted across the full flange widths of the channels. The web crippling test results are compared with the American Iron and Steel Institute (AISI 1996) Specification and the Australian/New Zealand Standard (AS/NZS 4600-1996) for cold-formed steel structures. The design web crippling strength predictions given by the specifications have …
Web Crippling Of Cold Formed Steel Members, K. Prabakaran, R. M. Schuster
Web Crippling Of Cold Formed Steel Members, K. Prabakaran, R. M. Schuster
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
A new design expression for web crippling of cold formed steel members has been developed. An extensive statistical analysis was performed using published test data from Canada, the United States, Sweden and France to develop new expressions for the web crippling strength of cold formed steel members under four different loading cases, i.e. (1) end one-flange loading (EOF), (2) interior one-flange loading (lOF), (3) end two-flange loading (ETF) and (4) interior two-flange loading (lTF). I-sections made of two channels connected back-to-back, Z-sections, channels and multiple web sections (decks) were considered. Comparisons were made with the web crippling expressions presented in …
Columns Under Loads Of Varying Eccentricity, J. Rhodes
Columns Under Loads Of Varying Eccentricity, J. Rhodes
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
A series of tests on small lipped channel section columns is reported in this paper. The columns were loaded with varying degrees of eccentricity. The eccentricity of loading was produced by offsetting the loading line from the neutral axis of the section, and the offset could be set to a different degree at each end of the column. By this means the effect of moment variation along the column could be examined experimentally and the results compared with the predictions of different design codes for this type of loading. The predictions of the 1986 AISI Specification, the British Standard and …
Shift Of The Effective Centroid Of Channel Columns, Ben Young, Kim J. R. Rasmussen
Shift Of The Effective Centroid Of Channel Columns, Ben Young, Kim J. R. Rasmussen
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
In the design of pin-ended channel columns, it is necessary to account for the shift of the effective centroid caused by local buckling. The current American Iron and Steel Institute (AISI 1996) Specification and the Australian/New Zealand Standard (AS/NZS 4600-1996) for cold-formed steel structures calculate the shift by use of effective widths. However, the ability of the effective width rules to accurately predict this shift has not been experimentally assessed. In this paper, recent tests on fixed-ended channel columns are used to obtain values of the shift of the effective centroid, including its variation with the applied load. In the …
Tests Of Cold-Formed Channel Columns, Ben Young, Kim J. R. Rasmussen
Tests Of Cold-Formed Channel Columns, Ben Young, Kim J. R. Rasmussen
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The paper presents a series of tests on cold-formed plain and lipped channel columns, compressed between fixed and pinned ends. While it is well-known that local buckling of pin-ended channel columns induces overall bending, this phenomenon does not occur in fixed-ended channel columns which remain straight after local buckling and only bend when overall buckling occurs. These fundamentally different effects of local buckling on the behaviour of pin-ended and fixed-ended channel sections lead to inconsistencies in traditional design approaches, which account for full or partial rotational end restraint solely by using effective lengths. A series of tests was performed on …
A European Design Code For Pallet Racking, M. H. R. Godley, J. Michael Davies
A European Design Code For Pallet Racking, M. H. R. Godley, J. Michael Davies
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The work leading to a European design code for pallet racking started almost 25 years ago. Many difficulties were encountered in the early days of this work. Notable were the absence of a consistent safety philosophy between the various countries of Europe and the existence of procedures with which the manufacturers were comfortable but which were potentially unsafe. There were also difficulties in defining acceptable standard. test procedures. The emergence of Eurocode 3, especially Part 1.3 dealing with cold formed sections, provided a new impetus to the work because here was a European code which provided the required basis for …
Disclaimer And Acknowledgments, University Of Missouri - Rolla
Disclaimer And Acknowledgments, University Of Missouri - Rolla
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Past Proceedings: Fourth International Conference On Case Histories In Geotechnical Engineering, St. Louis (1998), Multiple Authors
Past Proceedings: Fourth International Conference On Case Histories In Geotechnical Engineering, St. Louis (1998), Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Meet The Speakers, Multiple People
Meet The Speakers, Multiple People
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Preface, Shamsher Prakash
Preface, Shamsher Prakash
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Fourth International Conference On Case Histories In Geotechnical Engineering, Multiple Authors
Fourth International Conference On Case Histories In Geotechnical Engineering, Multiple Authors
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Authors Index, Multiple Authors
Authors Index, Multiple Authors
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Meet Our Authors, Multiple Authors
Meet Our Authors, Multiple Authors
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Organizing Committee, Multiple Members
Organizing Committee, Multiple Members
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Exhibitors, Multiple People
Exhibitors, Multiple People
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Participant List, Multiple Participants
Participant List, Multiple Participants
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Past Proceedings: First International Conference On Case Histories In Geotechnical Engineering (1984), Multiple Authors
Past Proceedings: First International Conference On Case Histories In Geotechnical Engineering (1984), Multiple Authors
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Past Proceedings: Second International Conference On Case Histories In Geotechnical Engineering (1988), Multiple Authors
Past Proceedings: Second International Conference On Case Histories In Geotechnical Engineering (1988), Multiple Authors
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
List Of Sessions, Multiple Authors
List Of Sessions, Multiple Authors
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Estimating Post-Liquefaction Displacements In Embankment Dams And Priorities Remediation Measures, W. D. Liam Finn
Estimating Post-Liquefaction Displacements In Embankment Dams And Priorities Remediation Measures, W. D. Liam Finn
International Conference on Case Histories in Geotechnical Engineering
Large displacement analysis is used to simulate the failures of flood protection dikes in Hokkaido, Japan, which occurred during the 1993 Kushiro-oki earthquake. These studies served to validate the method of analysis. The analysis was then used to predict displacements in dikes with potential for liquefaction by relating displacements to geometric characteristics of the dikes: height, slopes, and thickness of potentially liquefiable layer. The predictions were verified using dike displacement data from the Nansei-oki earthquake of 1994. The basis for reliable post-liquefaction analysis is a good estimate of the residual strength of the liquefied soils. For this reason, recent developments …
Foundation Design And Performance Of The World's Tallest Building, Petronas Towers, Clyde N. Baker Jr., Elliott Drumright, Leonard M. Joseph, Ir. Tarique Azam
Foundation Design And Performance Of The World's Tallest Building, Petronas Towers, Clyde N. Baker Jr., Elliott Drumright, Leonard M. Joseph, Ir. Tarique Azam
International Conference on Case Histories in Geotechnical Engineering
The analysis and design of foundations for the World's Tallest Building are described. The results of the exploration and in-situ testing program required to define the foundation support conditions are presented. The Towers are supported on a mat foundation on barrettes in residual soil and weathered silt stone, sandstone formation overlying karstic limestone at depths ranging from 80 to more than 200 meters. The extensive grouting program required to fill major cavities in the limestone beneath the Tower mats is described. The settlement analysis performed utilizing modulus information developed from the in-situ testing program is outlined. Barrette lengths were varied …
O-Cell Testings Case Histories Demonstrate The Importance Of Bored Pile (Drilled Shaft) Construction Technique, John H. Schmertmann, John A. Hayes, Thomas Molnit, Lorj O. Osterberg
O-Cell Testings Case Histories Demonstrate The Importance Of Bored Pile (Drilled Shaft) Construction Technique, John H. Schmertmann, John A. Hayes, Thomas Molnit, Lorj O. Osterberg
International Conference on Case Histories in Geotechnical Engineering
Herein we review the Osterberg Cell, or O-cell, method for performing large capacity load tests on bored piles (drilled shafts), and demonstrate how it provides a new opportunity to assess the effects of construction technique. A sampling of 8 case histories, 7 with comparative testing, illustrates the impact of poor technique and thus demonstrates the importance of good construction technique. The poor techniques include inadequate bottom cleanout, failure to use drilling fluids, poor concrete placement, failure to roughen sides, and improper drilling tools. We conclude with a brief description of a recent, world record, 133 MN (15,000 tons) O-cell load …
A Recent Difficult Foundation Problem: The Case Of The New Tagus Bridge, Pedro Simão Sêco E Pinto, Ricardo Oliveira
A Recent Difficult Foundation Problem: The Case Of The New Tagus Bridge, Pedro Simão Sêco E Pinto, Ricardo Oliveira
International Conference on Case Histories in Geotechnical Engineering
A brief description of the New Tagus Bridge is presented. The main site geological conditions and the field and laboratory tests are described. The seismic studies related to the design spectra, the liquefaction potential assessment and the seismic pile analysis are presented. The pile load tests (both static and dynamic) carried out on trial piles are described. The objectives of reception tests for piles and monitoring during the construction phase and the long term are presented.
Recent Experiences Of Tunneling And Deep Excavations In London, R. J. Mair
Recent Experiences Of Tunneling And Deep Excavations In London, R. J. Mair
International Conference on Case Histories in Geotechnical Engineering
The paper focuses on recent developments in tunnelling and deep excavations in London and it draws on the experiences of the Jubilee Line Extension project which has just been completed. A brief historical review is given of the first tunnels and deep excavations undertaken in London some 150 years ago. Construction methods recently used for bored tunnelling include sprayed concrete linings and closed face pressurised tunnelling machines. Ground movements observed for these various tunnelling operations and for deep excavations are reviewed, and their effects on buildings are discussed. The most extensive protective measure used on the Jubilee Line Extension to …
Risk And Reliability In Geotechnical Engineering, Suzanne Lacasse, Farrokh Nadim
Risk And Reliability In Geotechnical Engineering, Suzanne Lacasse, Farrokh Nadim
International Conference on Case Histories in Geotechnical Engineering
Statistics, reliability analyses and risk estimates can be very useful decision-making tools in geotechnical problems. Yet the methods are little used in practice. The offshore and mining industry are at the forefront for the use of these approaches, having encouraged their use and sponsored research that has enabled the methods to be well-documented and of proven usefulness in the study of alternatives for design and decision-making in face of uncertainties. The paper presents a few case studies in different areas of geotechnical engineering and discusses the results that would have been obtained without the use of the risk approach. Special …
Seismic Design Of Cellular Cofferdams, R. Scott Steedman
Seismic Design Of Cellular Cofferdams, R. Scott Steedman
International Conference on Case Histories in Geotechnical Engineering
Sheet pile cellular cofferdams (retaining walls) are robust structures, capable of withstanding significant deformation without collapse. Traditionally their use in the construction process has been associated with temporary works, but increasingly there is a demand to make use of this type of structure as part of the permanent works. However, although the design of cofferdams to resist static loads is relatively well documented, there are few examples in the literature of design approaches for seismic conditions. This paper describes the seismic design process for cellular cofferdams, drawing upon case histories in the US, CK and Japan. Comparisons are made with …
State Of The Art Of Soil Improvements With Case Histories, Joseph P. Welsh
State Of The Art Of Soil Improvements With Case Histories, Joseph P. Welsh
International Conference on Case Histories in Geotechnical Engineering
Soil improvement techniques for geotechnical construction can be broadly classified as densification, reinforcement, adhesion and excavation/replacement. This paper presents an overview of selected soil improvement techniques, with significant case histories. The soil improvement techniques discussed include Vibro-Compaction, Vibro-Replacement (stone columns), Dynamic Deep Compaction, compaction grouting, chemical grouting, jet grouting and soil fracture grouting.
Axial Load Capacity Of Piles In Sand, Roy E. Olson, Magued G. Iskander
Axial Load Capacity Of Piles In Sand, Roy E. Olson, Magued G. Iskander
International Conference on Case Histories in Geotechnical Engineering
The axial load capacity of individual piles in cohesionless soils can be estimated at design time using a variety of methods. Because of the difficulties in modeling the process of pile driving, set-up, and loading of piles, useful methods are based on case histories a load tests. Perhaps the most common approach in current use is to specify a soil/pile friction angle, an earth pressure coefficient, a tip bearing capacity factor, and appropriate limits on side shear and end bearing. The various parameters may be made functions of soil classification, relative density, depth, or whatever other variables the investigator thinks …
Bearing Capacity Of Footings On Compacted Sand, Alan J. Lutenegger, Michael T. Adams
Bearing Capacity Of Footings On Compacted Sand, Alan J. Lutenegger, Michael T. Adams
International Conference on Case Histories in Geotechnical Engineering
This paper presents the results of footing load tests conducted on compacted sand beds to evaluate the bearing capacity and load-displacement characteristics of shallow foundations. Tests were conducted on square concrete footings with widths of 0.30, 0.61, 0.91, and 1.22 m and with embedment ratios (D/B) of 0, 0.5, and 1.0 to investigate the influence of footing size and embedment on the load-displacement behavior and ultimate bearing capacity. A description of the soil and test procedures used is given and the results of the footing load tests are presented. A discussion of the definition of ultimate bearing capacity and the …