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The Seismic Performance of Coupled Reinforced Concrete Walls
Author: Jacob A. Turgeon | Size: 15.4 MB | Format:PDF | Quality:Unspecified | Publisher: University of Washington | Year: 2011 | pages: 436
Reinforced concrete core walls are used commonly in modern building construction as the primary lateral-load resisting system. Common core wall con gurations include solid walls in one direction and walls with openings in the orthogonal direction to access ele-vators or to meet architectural requirements. Therefore, in the orthogonal direction, the walls are typically coupled together by reinforced concrete \coupling" beams. A signi - cant amount of research has focused on the design of coupling beams to ensure that they exhibit ductile response through multiple cycles to large drift demands. However, only a few research studies have investigated the seismic behavior of coupled wall systems, and most of these previous studies have considered coupled-walls in low-rise structures. Most
coupled walls are used in elevator cores, which are more typical in mid- to high-rise con- struction. A research study was undertaken by faculty and students at the Universities of Washington and Illinois to speci cally investigate this category of structural system. The advanced testing capabilities of the NEES University of Illinois at Urbana-Champaign (UIUC) testing facility permitted unique experimental simulation of this system.
The coupled-wall test specimen simulated the bottom three stories of a ten-story building in a region of high seismicity designed with typical geometry and reinforcement.
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DETAILING OF PLASTIC HINGES IN SEISMIC DESIGN OF CONCRETE STRUCTURES
Author: Rajesh P Dhakal and Richard C Fenwick Department of Civil and Natural Resources Engineering, University of Canterbury Christchurch 8020, New Zealand | Size: 310 KB | Format:PDF | Quality:Unspecified | pages: 23
In recent revisions of the Structural Design Codes in New Zealand, a number of changes have been made to seismic design provisions. One of the more significant revisions was the way in which the level of detailing is determined for potential plastic hinges. Previously the level of detailing was based principally on the structural ductility factor, which is broadly similar to the reduction factor, R, used in US practice. With the revision it is based on the predicted magnitude of curvature that the plastic hinge is required to sustain in the ultimate limit state. This paper explains why the structural ductility factor does not give a reliable guide to the deformation sustained in an individual plastic hinge. In addition, based on test results of 37 beams, 25 columns and 36 walls, design curvature limits are proposed for different categories of plastic hinge.
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Seismic performance of a 12-storey ductile concrete shear wall system designed according to the 2005 National building code of Canada and the 2004 Canadian Standard Association standard A23.
Author: Yannick Boivin and Patrick Paultre | Size: 1.1 MB | Format:PDF | Quality:Unspecified | Publisher: Can. J. Civ. Eng. 37: 1–16 (2010) doi:10.1139/L09-115 | Year: 2010 | pages: 16
This paper presents an assessment of the seismic performance of a ductile concrete core wall used as a seismic
force resisting system for a 12-storey concrete office building in Montre ´al, designed according to the 2005 National building
code of Canada (NBCC) and the 2004 Canadian Standards Association standard A23.3. The core wall consists of a
cantilever wall system in one direction and a coupled wall system in the orthogonal direction. The building is analyzed in
the nonlinear regime. The main conclusion from this work is that the capacity design shear envelope for the studied wall
structure largely underestimates that predicted, primarily in the cantilever wall direction, and this in turn significantly increases
the risk of shear failure. This issue is essentially due to (i) an underestimation by the new NBCC spectral response
acceleration of the higher mode responses of a reinforced concrete wall structure whose seismic response is dominated by
higher modes; and (ii) a deficiency in the capacity design method in estimating the wall shear demand on such walls, even
when their behavior is lightly inelastic.
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This book covers water quality indices (WQI) in depth - it describes what purpose they serve, how they are generated, what are their strengths and weaknesses, and how to make the best use of them. It is a concise and unique guide to WQIs for chemists, chemical/environmental engineers and government officials.
Whereas it is easy to express the quantity of water, it is very difficult to express its quality because a large number of variables determine the water quality. WQIs seek to resolve the difficulty by translating a set of a large number of variables to a one-digit or a two-digit numeral. They are essential in communicating the status of different water resources in terms of water quality and the impact of various factors on it to policy makers, service personnel, and the lay public. Further they are exceedingly useful in the monitoring and management of water quality.
With the importance of water and water quality increasing exponentially, the importance of this topic is also set to increase enormously because only with the use of indices is it possible to assess, express, communicate, and monitor the overall quality of any water source.
- Provides a concise guide to WQIs: their purpose and generation
- Compares existing methods and WQIs and outlines strengths and weaknesses
- Makes recommendations on how the indices should be used and under what circumstances they apply
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Exploiting Nonlinear Behavior in Structural Dynamics
Author: Lawrie Virgin, David Wagg (auth.), David J. Wagg, Lawrence Virgin (eds.) | Size: 6 MB | Format:PDF | Quality:Original preprint | Publisher: Springer Vienna | Year: 2012 | pages: 280 | ISBN: 978-3-7091-1186-4, 978-3-7091-1187-1
The articles in this volume give an overview and introduction to nonlinear phenomena in structural dynamics. Topics treated are approximate methods for analyzing nonlinear systems (where the level of nonlinearity is assumed to be relatively small), vibration isolation, the mitigation of undesirable torsional vibration in rotating systems utilizing specifically nonlinear features in the dynamics, the vibration of nonlinear structures in which the motion is sufficiently large amplitude and structural systems with control.
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Stochastic Structural Dynamics: Application of Finite Element Methods
Author: Cho W. S. To | Size: 13 MB | Format:PDF | Quality:Unspecified | Publisher: Wiley | Year: 2013 | Pages: 350 | ISBN: 1118342356, 9781118342350
The parallel developments of the Finite Element Methods in the 1950’s and the engineering applications of stochastic processes in the 1940’s provided a combined numerical analysis tool for the studies of dynamics of structures and structural systems under random loadings. In the open literature, there are books on statistical dynamics of structures and books on structural dynamics with chapters dealing with random response analysis. However, a systematic treatment of stochastic structural dynamics applying the finite element methods seems to be lacking. Aimed at advanced and specialist levels, the author presents and illustrates direct integration methods for analyzing the statistics of the response of structures to stochastic loads. The analysis methods are based on structural models represented via the Finite Element Method. In addition to stationary linear problems the text also addresses non-stationary excitation and systems with spatially stochastic property variations.
Key features:
- A systematic treatment of stochastic structural dynamics applying the finite element methods
- Highly illustrated throughout and aimed at advanced and specialist levels, it focuses on computational aspects instead of theory
- Emphasizes results mainly in the time domain with limited contents in the frequency domain
- Presents and illustrates direct integration methods for analyzing the statistics of the response of structures to stochastic loads.
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DD ENV 1992-4:2000, Eurocode 2: Design of concrete structures - Part 4: Liquid retaining and containing structures (together with United Kingdom National Application Document)
This Draft for Development was prepared by Subcommittee B/525/2 and is the official English language version of ENV 1992-4:1998 Eurocode 2: Design of concrete structures - Part 4: Liquid retaining and containment structures, as published by the European Committee for Standardization (CEN). This Draft for Development also includes the United Kingdom (UK) National Application Document (NAD) to be used with the ENV in the design of structures to be constructed in the UK.
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