Public water systems deliver high-quality water to the public. They also present a vast array of problems, from pollution monitoring and control to the fundamentals of hydraulics and pipe fitting
Table of contents:
Preface.
Criteria and Standards for Portable Water Quality.
Inorganic and Radionuclide Contaminants.
Organic Compounds in Drinking Water.
Microbiology of Drinking Water.
Water Chemistry.
Specific Contaminant Removal Methodologies.
Water System Planning.
Source Water Development.
Aeration and Air Stripping.
Coagulation and Flocculation.
Sedimentation and Other Clarification Processes.
Filtration.
Water Softening.
Iron and Manganese Removal.
Membrane Treatment.
Oxidation.
Activated Carbon Treatment.
Ion Exchange and Activated Alumina Sorption.
Disinfection.
Fluoridation and Defluroridation.
Distribution System Corrosion: Monitoring and Control.
Water Quality Control in Distribution Systems.
Residuals Management.
Chemical Storage and Feeding Systems.
Package Water Treatment Systems.
Plant Hydraulics.
Storage.
Distribution Systems.
Pumping Systems.
Energy Management for Water Treatment Facilities.
Electrical Design Considerations.
Economic and Financial Issues.
Appendix A: Financial Statistics Tables.
Appendix B: Periodic Table of the Elements.
Appendix C: Atomic Weight.
Appendix D: Metric Conversion Units.
Appendix E: Physical Properties of Water.
Appendix F: Compatibility of Various Chemicals.
Appendix G: Chemicals Used in Treatment of Water and Wastewater.
Index.
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Title "Experimental study of undrained lateral and moment behavior of drilled shafts during static and cyclic loading"
Volume 100221 de EPRI TR
Authors: P. W. Mayne, Fred H. Kulhawy, Charles Home Trautmann, Cornell University. Geotechnical Engineering Group, Electric Power Research Institute
Editor : Prepared for Electric Power Research Institute, 1992
Original document provided by University of Cornell
Title P-Y modeling of soil-pile interaction
Author Jung-Feng Chang
Éditor Cornell University, Jan., 2006
Original document provided by University of Cornell
Length 710 pages
Author: D M. Rogowsky, Ph. D P.Eng. P Marti, Dr sc. techn., P. Eng | Size: 1.3 MB | Format:PDF | Publisher: VSL INTERNATIONAL LTD. Bern, Switzerland | Year: 96 | pages: 52 | ISBN: unknown
Contents
1.Preface
1. Introduction 2
1.1 Objective and Scope 2
1.2 Background 2
1.3 Organization of Report 3
2. General Principles 4
2.1 Post-tensioning in a Nut Shell 4
2.2 Design Models 4
2.3 Performance Criteria 5
2.4 General and Local Anchorage Zones 7
3. Local Zone Design 8
3.1 General 8
3.2 VSL Anchorage Type E 8
3.3 VSL Anchorage Type EC 10
3.4 VSL Anchorage Type L 11
3.5 VSL Anchorage Type H 13
4. General Zone Design 16
4.1 Single End Anchorages 16
4.2 Multiple End Anchorage 19
4.3 Interior Anchorages 19
4.4 Tendon Curvature Effects 26
4.5 Additional Considerations 31
5. Design Examples 34
5.1 Multistrand Slab System 34
5.2 Monostrand Slab System 36
5.3 Bridge Girder 38
5.4 Anchorage Blister 43
6. References 49
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Example of a post-tensioned plate for a residential high-rise building
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Dynamic modelling of post-tensioned concrete floors using finite element analysis
Until the 1990 s problematic floor vibrations under human-induced dynamic loading, such as
walking, were typically associated with relatively light timber and composite steel-concrete floors.
However, as modern suspended floor structures made entirely of concrete become increasingly
slender, problems associated with occupant-induced vibrations are also becoming a very important
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D.N. Grant, C.A. Blandon, M.J.N. Priestley "Modelling Inelastic Response in Direct Displacement-Based Design", Research Report Rose 2005/03
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The direct displacement-based design (DBDD) method requires the definition of equivalent viscous damping to accurately predict the peak nonlinear response. Equivalent viscous damping is usually specified as the sum of a viscous and hysteretic component, where the former is assumed to be constant, and the latter depends on the ductility and hysteresis model.
The characterisation of viscous damping in time history analysis is discussed. Although it has been more common in the past to use a constant damping coefficient for single-degree-of-freedom time history analyses, it is contended that tangent-stiffness proportional damping is a more realistic assumption for inelastic systems. Analyses are reported showing the difference in peak displacement response of single-degree-of-freedom systems with various hysteretic characteristics analysed with 5% damping ratio applied as either a constant damping coefficient or tangent-stiffness proportional damping. The difference is found to be significant, and dependent on hysteresis rule, ductility level and period. The relationship between the level of elastic viscous damping assumed in time-history analysis, and the value adopted in DDBD is investigated. It is shown that the difference in characteristic stiffness between time-history analysis (i.e. the initial stiffness) and displacement based design (the secant stiffness to maximum response) requires a modification to the elastic viscous damping added to the hysteretic damping in DDBD.
Numerical analyses are carried out to study the combination of hysteretic and viscous energy dissipation in nonlinear analysis. Expressions are calibrated that describe the ductility and period dependence of the equivalent viscous damping, for a range of hysteresis and damping models. It is found that simple equations are able to provide accurate values of equivalent viscous damping for both analytical research, and practical design applications of DDBD.
This British Standard specifies the technical delivery requirements for weldable weather resistant steels for general structural and engineering purposes in the form of hot finished hollow sections of circular, square or rectangular form. It also applies to hollow sections formed hot with or without subsequent heat treatment or formed cold with subsequent heat treatment to obtain equivalent metallurgical conditions to those obtained in the hot formed product. However, in the case of hollow sections formed from plate and with the seams metal arc welded, this standard covers only the requirements for the plate material. The products are equally suitable for bolted and riveted structures. The products specified in this British Standard are intended for use in construction. Requirements for tolerances, dimensions and sectional properties are specified in BS EN 10210-2.
NOTE Two material grades are specified in this standard and the user should select the grade appropriate to the intended use and service conditions. The grades and mechanical properties are compatible with those in BS EN 10155.
This British Standard does not apply to products covered by BS EN 10025, BS EN 10113 (all parts), BS EN 10155, BS EN 10210-1, BS EN 10219-1, BS EN 10219-2 and BS EN 10225.
In addition to the definitive requirements, this standard also requires the items detailed in Clause 4 to be documented. For compliance with this standard, both the definitive requirements and the documented items have to be satisfied.
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This British Standard provides recommendations for methods for the fatigue design and assessment of parts of steel structures which are subject to repeated fluctuations of stress. It is concerned with wrought structural steel with specified minimum yield strength of up to 700 N/mm2 operating in the sub-creep regime.
This standard is applicable to the following:
a) parent material remote from joints;
b) welded joints (in air or sea water) in such material;
c) bolted or rivetted joints in such material;
d) shear connectors between concrete slabs and steel girders acting compositely in flexure.
Guidance on general fatigue design philosophy is given in Annex A, which also contains a brief description of the method of using this standard.
This standard takes no account of the possible onset of unstable fracture from a fatigue crack.
This standard does not apply to the following:
orthotropic decks;
wire ropes;
bonded connections;
steel reinforcement in concrete;
out of plane joints between hot rolled rectangular or square hollow sections;
pressure vessels;
castings;
peening.
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