Empirical Correlations: Drained Shear Strength for Slope Stability Analyses
Author: Stark, T. and Hussain, M. | Size: 303 KB | Format:PDF | Quality:Unspecified | Publisher: ASCE | Year: 2013 | pages: 10
Empirical correlations provide estimates of parameter values for preliminary design, verification of laboratory shear test data, and confirmation of back-analysis of a failed slope. The empirical correlations presented herein use liquid limit, clay-size fraction, and effective normal stress to capture the variability and stress-dependent nature of drained residual and fully softened strength envelopes. This paper describes the testing and analysis used to increase the number of data points in the existing correlations, expand the residual strength correlation to include an effective normal stress of 50 kPa, and develop correlations between values of liquid limit and clay-size fraction measured using sample processed through a No. 40 sieve (ASTM procedure) and values derived using ball-milled/disaggregated sample. In addition, equations are presented to express the empirical correlations used to develop a spreadsheet that estimates the residual and fully softened friction angles based on entered values of liquid limit and clay-size fraction
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Plate-load tests are considered the most reliable and informative source of soil-deformation properties required for a successful foundation design. Plate-load test results are influenced by many factors: plate or experimental foundation dimensions/configuration, soil conditions, testing technique, etc. Numerous experiments demonstrated that there is a linear relationship between settlements of plates or foundations and square roots of their areas varying between approximately 0.06 and 25.0 m². Two major soil parameters (deformation modulus and proportionality limit) can be determined utilizing a load-settlement curve developed from field tests. Collapsible soil behavior under foundations depends on the degree of soil-saturation values. This paper presents the results of plate-load tests performed on collapsible soils under in situ and wetted conditions. The results of laboratory and field tests are compared.
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Development of Ring-Shaped Steel Plate Shear Walls
Author: Maurya, A., Egorova, N., and Eatherton, M. | Size: 1.2 MB | Format:PDF | Quality:Unspecified | Publisher: ASCE | Year: 2013 | pages: 12
Steel plate shear walls (SPSWs) are an attractive option for seismic lateral
load resisting systems for both new and retrofit construction. However, the current
approach to SPSWs in the U.S. typically uses very thin web plates, large boundary
elements, and requires costly moment connections. Resulting SPSWs suffer from
early buckling and subsequent tension-only plate behavior which leads to pinched
hysteretic behavior, reduced stiffness, and limited energy dissipation. Moreover, the
large boundary elements and moment connections can make SPSW less economical
than concentrically braced frames.
This paper describes a new type of SPSW referred to as ring-shaped steel
plate shear walls (RS-SPSWs) which build on the advantages of steel plate shear
walls, but have improved seismic performance, develop reduced demands on
boundary elements, and allow simple shear beam-to-column connections. RS-SPSW
reduces buckling by utilizing a unique pattern of ring-shaped cut-outs. The ring shape
acts to remove excess material in the direction transverse to the tension direction thus
reducing the amount of buckling. Its geometric features also result in more
independent variables which can be varied to separately tune aspects of system
behavior like strength, stiffness, ductility and energy absorption of the shear wall
system. This paper focuses on the effect of geometric design variables on system
behavior. After validation against experimental test results, finite element modeling
is used to perform a parametric study.
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Database of Friction Angles of Sand and Consolidation Characteristics of Sand, Silt, and Clay
Author: Andersen, K. and Schjetne, K. | Size: 3.1 MB | Format:PDF | Quality:Unspecified | Publisher: ASCE | Year: 2013 | pages: 16
The paper presents diagrams of the (1) drained and undrained effective stress friction angles of sand; (2) dilatancy angle of sand; (3) parameters in a nonlinear constrained modulus expression for virgin loading, unloading, and reloading on sand and silt; and (4) diagrams with the coefficient of permeability for sand, silt, and clay. The database parameters are suitable for preliminary assessments or applications when assumed parameters are acceptable. The database can also be helpful in planning and interpreting site-specific tests and in reducing the number of site-specific tests. For important projects the parameters should be determined by site-specific tests
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I am searching for this research paper :
"Approximate Formulae for Determining the Effective Length of Steel Columns to BS 5950" By Author(s): Smyrell, A G
Published in March 1993 issue of "The Structural Engineer " Journal of Institution of Structural Engineer London
Preface :
This paper presents approximate formulae that may be used to determine the effective length of steel columns designed to BS 5950. These formulae give the designer an alternative to the graphical method given in Appendix E of the Code. The approximate formulae are normally accurate to better than the second decimal place. This approach follows the development of simple computer routines for incorporation into column and frame design programs. A.G. Smyrell
the journal can be found here :
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Author: Bernhard Maidl, Martin Herrenknecht, Ulrich Maidl, Gerhard Wehrmeyer, David Sturge | Size: 68 MB | Format:PDF | Quality:Unspecified | Publisher: Ernst & Sohn | Year: 2012 | pages: 490 | ISBN: 9783433029954
Mechanised shield tunnelling has developed considerably since the publication of the first edition of this book. Challenging tunnel projects under difficult conditions demand innovative solutions, which has led to constant further development and innovation in process technology, constructions operations and the machines and materials used.The book collects the latest state of technology in mechanised shield tunnelling. It describes the basics of mechanised tunnelling technology and the various types of machines and gives calculation methods and constructural advice. Further chapters cover excavation tools, muck handling, tunnel support, surveying and steering as well as workplace safety. There is also detailled information about contractual aspects and process controlling.
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The only modern guide to all aspects of practical tunnel construction
Practical Tunnel Construction fills a void in the literature for a practical guide to tunnel construction.
By taking the reader through a brief introduction and history to a comprehensive discussion of how the geological factors affect tunneling, the author covers the stages and technology that are common today without using complex equations. Written for the individual who does not have an extensive background in tunneling but who has to make tunneling decisions, the various tunneling methods are discussed to help in the determination of the appropriate method. The methods discussed are: hand mining, drill/blast, Tunnel Boring Machine (TBM), New Austrian Tunnelling Method (NATM), Norwegian Method of Tunnelling (NMT), Roadheader, Earth Pressure Balance Machine (EPBM), and Slurry Pressure Balance Machine (SPBM). This book focuses on driven tunnels.
This versatile handbook:
• Offers clear and accessible coverage of the state of the art in tunnel construction
• Introduces the essentials of design and construction of many types of tunnels, including TBM, EPB, Roadheader, NATM, drill and blast, and soft ground tunneling
• Provides nontechnical guidance on selecting the most appropriate tunneling methods for various situations
• Includes a brief history of tunneling and an introduction to geotechnical considerations
• Discusses tunnel access shaft construction, mucking methods, tunnel haulage, grout, water handling, and much more
Practical Tunnel Construction is an important resource for students, construction managers, tunnel designers, municipal engineers, or engineers who are employed by government agencies or corporations that are exploring the feasibility of planning and designing or building a tunnel.
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An Introduction to cable roof structures - 2nd Edition
Author: Hans Anton Buchholdt | Size: 10.5 MB | Format:PDF | Quality:Unspecified | Publisher: Thomas Telford Ltd | Year: 1987 | pages: 304 | ISBN: 9780727726247
The second edition of this book provides structural engineers with a concise introduction to the architectural, structural and technological aspects of cable roofs, and supplies sufficient information for engineers to carry out their own designs. The improved methods for generating wind and earthquake histories have been included as the trend in modern design codes seem increasingly to require that dynamic response of other forms of non-linear structures such as guyed masts is considered at the design stage. Other additions include an expansion of the chapter on dynamic analysis into three separate chapters, one dealing with frequency domain analysis of weakly non-linear structures, another with time domain analysis of more non-linear structures, and a third with the level and mathematical modelling of damping.
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