Posted by: mowafi3m - 05-27-2011, 07:41 AM - Forum: Steel
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a study on the seismic behaviour of a 52-story steel frame building
Author: YUMING DING | Size: 8 MB | Format:PDF | Publisher: the universty British columbia | Year: 1999 | pages: 137 | ISBN: unknown
this is an advanced study on an existing steel building in LOS ANGELES
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The European Manual for in-situ Assessment of the Earthquake Resistance of Important Existing Structures consists of Part I: Training and Part II: Practical Application and focuses on state of the art methods and innovative procedures for the assessment of the following important existing structures:
• Buildings whose integrity during earthquakes is of vital importance for civil protection, e.g. hospitals, fire stations, power plants, telecommunication facilities, etc. (importance class IV according to EN1998-1:2005)
• Bridges of critical importance for maintaining communications, especially in the immediate post-earthquake period, bridges where failure is associated with a large number of probable fatalities and major bridges, where a design life greater than normal is required (importance class III according to EN 1998-2:2005)
• Buildings whose seismic resistance is of importance in view of the consequences associated with a collapse, e.g. schools, assembly halls, cultural institutions, etc. (importance class III according to EN1998-1:2005)
• Industrial facilities, where secondary risks exist, e.g. the risk of release of toxic and/ or explosive materials
• Cultural heritage These structures must remain greatly undamaged and serviceable after an earthquake.
In order to achieve this goal a pre-earthquake phase involving investigations, structural analysis and safety assessment is required. The results of this activities provide the “state of consistence” of the structure and allow to plan and undertake measures for seismic upgrading in due time, if necessary. Normally the highest level of knowledge is necessary to afford safety assessments for such structures and it is attained by setting a detailed, often 3D, structural model, based on careful surveys and updated by using measured insitu dynamic properties. It is one of the basic ideas of SP5 to integrate experimental techniques into the assessment procedure, which is an advantage one has in the case of existing buildings
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Author: K C Brady, G R A Watts and IVi R Jones | Size: 3 MB | Format:PDF | Publisher: TRL Limited | Year: 2001 | pages: 78
This report describes the nature of foamed concrete, its composition and properties and how it could be specified for use in civil engineering works. Because the properties of foamed concrete can vary widely, and it can be used in a wide variety of applications, it is important to define performance requirements for each case. Current usage in the UK of foamed concrete is of the order of 250,000 tonnes per year Despite this fairly significant tonnage there is, as yet, no definitive guidance on how the material should be tested and specified for use. Furthermore there is a paucity of information on some of its properties, particularly regarding its long-term performance. This situation might be restricting the wider use of foamed concrete for ground engineering and structural applications. The report provides a brief history of the development of foamed concrete and gives examples of contemporary uses. The quality control tests that might be applied to foamed concrete are described; some of these differ from those used for normal weight concrete. An example specification for foamed concrete is provided, which includes both mandatory and optional requirements. Distinction is made between clauses for use with all applications and those required for specific applications. Guidance on acceptance criteria and actions to be taken in the event of non-conformance is also provided.
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Author: Harold Anderson | Size: n/a MB | Format:PDF | Publisher: Best Pub Co | Year: 2001 | pages: 328 | ISBN: 0941332926
Product Description
If you want a book in your library that will assist and guide you through the marine cofferdam design and construction process...this is it! This text is the only comprehensive review of marine cofferdam planning, design, estimating and construction available on the U.S. market today. Marine contractors and construction engineers will want this unique and comprehensive book in their reference libraries.
Hardcover: 328 pages
Publisher: Best Pub Co (April 1, 2001)
Language: English
ISBN-10: 0941332926
ISBN-13: 978-0941332927
Author: PSC ASSOCIATES, INC. | Size: 69 MB | Format:PDF | Publisher: National Technical Information Service | Year: 1993 | pages: 350
Drilled shafts for many situations offer an economical alternative to driven piles. The Federal Highway Administration (FHW A) has spent considerable time and money in research and developing design and construction guidelines for drilled shafts. However, the full potential of the technology may not be realized because of both the uncertainty of the effects of construction on the actual service behavior and the limited knowledge on either reliable quality control tests to locate and evaluate defects, or inexpensive load test procedures.
The overwhelming majority of drilled shafts built to date have been constructed safely and have perfonned as their designers anticipated. However, the very occasional reported failures highlight the variables and unknowns present when working underground, particularly in water-bearing and potentially caving soils. This results in a lower risk tolerance for a single or double shaft supported pier compared to mUltiple pile
supported foundations.
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This study was conducted under the Federal Highway Administration (FHWA), Central Federal
Lands Highway Division (CFLHD) contract number DTFH68-03-P-00116. The current practice
in assessing the integrity of newly constructed drilled shaft foundations, or other concrete
structures that contain access tubes, is through the use of nondestructive testing (NDT) methods.
Most common NDT methods include crosshole sonic logging (CSL), gamma-gamma density
logging (GDL), and crosshole sonic logging tomography (CSLT). Numerous studies and field
investigations have been performed to evaluate the accuracy and effectiveness of these NDT
methods in detecting defects in drilled shafts. However, most of these studies have fallen short
to correctly identify and characterize defects for engineering decision making. Or, as stated by
Jerry DiMaggio (2004), FHWA Principal Geotechnical Engineer, “when using (NDT) methods,
the key questions that often must be answered are: (1) Is the test result a false negative? (2)
What are the next steps and who is responsible for incurred cost if a defect is suspected? and
most importantly (3) Is the discontinuity a defect?”
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Bentley MXroad V8i (SELECTseries 1) - 30 DAY TRIAL
Size: 620.74 MB
Bentley MXROAD is an advanced, string-based modeling tool that enables the rapid and accurate design of all road types. With MXROAD you can quickly create design alternatives to achieve the “ideal” road system. Upon selection of the final design alternative, MXROAD automates much of the design detailing process, saving the user time and money.
What’s enhanced in MXROAD and MXROAD Suite V8i (SELECT series 1)?
Roadway Designer Scheme manager for MX
Dynamic Surface Analysis caters for multiple MX models and boundary control. Utilizing Civil DTM technology changes to the design can be visualized quickly/dynamically without the need to run MX analysis/display options.
AutoCAD 2010 is now a supported environment to run MX. Bringing the supported AutoCAD versions to 2007, 2008, 2009, 2010
Enhanced menus and GUI customization using MicroStation Tasks and toolbars, providing fully customizable MX toolbars in the standalone and MicroStation environments
Reference file management now supported through input files via the MX script manager
Dynamic Section Enhancements
MX specific improvements to Accudraw
Incorporation of Bonus tools
Display Styleset - providing the ability to graphically test all features in a style set
Extend a String - providing the ability to extend a string to a string or a point or by distance and calculate the level
Support added for LandXML 1.2 schema
MX Engine Enhancements
Command Macros now enhanced to allow arithmetic between two or three variables
Use of different macro lines to display Interface strings
Interface now honors the String Naming Convention on Repeat Patterns, Rounding, and Circular Ditches
Drainage Design Enhancements
More than one pipe between two nodes
Display surface flow to upstream inlet
Automatic inlet spacing – general improvements for:
Inlet rules files now support efficiency
Support for combined curb and drainage systems
30 day trial
DIRECT LINKS
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Understanding Structural Engineering From Theory to Practice
Author: Wai-Fah Chen, Salah El-Din E. El-Metwally | Size: 27.6 MB | Format:PDF | Publisher: CRC Press | Year: May 2011 | pages: 271 | ISBN: 9781439827109
In our world of seemingly unlimited computing, numerous analytical approaches to the estimation of stress, strain, and displacement, including analytical, numerical, physical, and analog techniques, have greatly advanced the practice of engineering. Combining theory and experimentation, computer simulation has emerged as a third path for engineering design and performance evaluation. As a result, structural engineers working in the practical world of engineering must apply, and ideally, thrive, on these idealizations of science-based theories.
Analyzing the major achievements in the field, Understanding Structural Engineering demonstrates how to bring science to engineering design. This book illustrates:
* Key conceptual breakthroughs in structural engineering in the 20th century
* The science of structural engineering from basic mechanics and computing to the ultimate process of engineering design
* How engineers implement theory to practice through idealizations and simplifications
* Covers current and future trends in structural engineering
Developments and advancements in structural engineering hinge on a few key breakthroughs in concepts, simplifications and idealizations. Simplification, the art of structural engineering, is a key theme throughout this book. But the authors go further—their clear explanations of the role and impact of new, science-based developments shows you how to put them into practice.
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The first edition of Rock Mechanics and Engineering bridged the gap between scientific research on rock mechanics and practical engineering. It was resolutely aimed at giving practical information to geologists, engineering geologists and engineers. Emphasis was placed on the lessons to be learnt from the study of case histories, with the Malpasset Dam rupture and the large Vajont rock slide amongst those described. In this second, enlarged edition the author continues to emphasise aspects of rock mechanics. Modern efforts at establishing an engineering classification of rocks are summarised and considerable attention is given to the Austrian tunnelling method. Firm in his belief that there is no better way to study the subject than by the detailed analysis of case histories, Dr Jaeger has incorporated a number of new ones, for example the discussion on the engineering classification of jointed rock masses and the required rock support is illustrated by descriptions of the second Gotthard Tunnel and the design of the third, much larger tunnel.
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Within the series "WBI-PRINT, geotechnical engineering in research
and practice", volumes 4 to 7 are designed as a compendium of tunnel
statics. This compendium started with the volume WBI-PRINT 4
"Stability analysis for tunnels, fundamentals", published in 1999
in German and in 2000 in English.
The present volume WBI-PRINT 5 "New Austrian Tunneling Method stability
analysis and design" covers, beside fundamentals of the New
Austrian Tunneling Method (NATM), case histories of realized mined
tunnels designed and constructed with participation of WBI.
The selected case histories from the years 1985 to 2001 include
crown headings with open and closed invert, sidewall adit headings,
full-face headings and headings under the protection of pipe
umbrellas and jet grouting columns.
Analyses according to the finite element method have proved to be
an indispensable tool for the design of tunnels. The stability
analyses for all case histories presented were carried out using
the program system FEST03. In order to enable this program system
to be used by our professional colleagues as well, we have been
offering it for sale for some little time now.
WBI-PRINT 5 has been previously published 2002 in German as a paperback.
Now the English translation is available online to provide
a worldwide access to those who are interested in tunneling.
It is also available on CD-ROM via WBI company.
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