DYNAMIC ANALYSIS OF STRUCTURES WITH INTERVAL UNCERTAINTY
Author: MEHDI MODARRESZADEH | Size: 483 KB | Format:PDF | Quality:Unspecified | Publisher: Department of Civil Engineering CASE WESTERN RESERVE UNIVERSITY | Year: 2005 | pages: 98
A new method for dynamic response spectrum analysis of a structural system with interval uncertainty is developed. This interval finite-element-based method is capable of obtaining the bounds on dynamic response of a structure with interval uncertainty. The proposed method is the first known method of dynamic response spectrum analysis of a structure that allows for the presence of any physically allowable interval uncertainty in the structure’s geometric or material characteristics and externally applied loads other than Monte-Carlo simulation. The present method is performed using a set-theoretic (interval) formulation to quantify the uncertainty present in the structure’s parameters such as material properties. Independent variations for each element of the structure are considered. At each stage of analysis, the existence of variation is considered as presence of the perturbation in a pseudo-deterministic system. Having this consideration, first, a linear interval eigenvalue problem is performed using the concept of monotonic behavior of eigenvalues for symmetric matrices subjected to non-negative definite perturbation which leads to a computationally efficient procedure to determine the bounds on a structure’s natural frequencies. Then, using the procedures for perturbation of invariant subspaces of matrices, the bounds on directional deviation (inclination) of each mode
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IUTAM Symposium on Vibration Control of Nonlinear Mechanisms and Structures:
Proceedings of the IUTAM Symposium held in Munich, Germany, 18-22 July 2005
(Solid Mechanics and Its Applications, Volume 130)
This book contains papers presented at the IUTAM Symposium on Vibration Control of Nonlinear Mechanism and Structures, held in Munich. Vibration control is applied to all kinds of engineering systems to obtain desired dynamic behaviour, improved accuracy and increased reliability during operation. Research in the field of vibration control is extremely comprehensive. On the one hand the mechanical system has to be modeled with modern techniques and on the other hand the corresponding control concepts have to be added to the system itself. The selection of modeling features together with modern control algorithms decides significantly on the performance of vibration control.
The latest developments related to control of structures, vibration isolation, control of vehicle dynamics, noise control, control of mechanisms and fluid-structure-interaction control is covered by this volume. Each author is a leading scientist in his field, which lends the book authority in the topics treated.
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Dear all, maybe someone in here have this book and can shared to us, thanks
Article/eBook Full Name: Formulae, Charts and Tables in the Area of Soil Mechanics and Foundation Engineering
Author(s): Edgar Schultze (Author), Alemayehu Teferra (Author)
Publish Date: 1988
ISBN: 9061918049
Published By: Taylor & Francis
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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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