EARTHQUAKE RESISTANCE OF STRUCTURES AND DYNAMIC RESPONSE USING LARGE FACILITIES EXPERIMENTS
Author: Miloš Drdácký and Stanislav Pospíšil | Size: 305 MB | Format:PDF | Quality:Unspecified | Publisher: aInstitute of Theoretical and Applied Mechanics, Czech Academy of Sciences, Prague, Czech Republic | pages: 10
The presented article treats some of the activity of the Institute of Theoretical and Applied Mechanics of Czech Academy of Sciences (ITAM). It focuses on the experimental part of the research that has a broad field of application in the industry and/or that has been dealt within international projects funded by the European commission. The use of European and institutional facilities simulating the earthquake is presented as well as the methods of the structural assessment using dynamic response of
structures. Besides the experimental devices and methods used at the ITAM for assessment of vulnerability of structures to dynamic load are briefly mentioned
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Past severe earthquakes indicate that structural pounding may cause considerable damage or even lead to collapse of colliding structures if the separation distance between them is not sucient. Because of its complexity, modelling of impact is an extremely dicult task, however, the precise numerical model of pounding is essential if an accurate structural response is to be simulated. The aim of this paper is to analyse a non-linear viscoelastic model of collisions which allows more precise simulation of the structural pounding during earthquakes. The eectiveness of the model is veried by comparing the results of numerical analyses with the results of experiments conducted on pounding between dierent types of structures. The results of the study indicate that, compared to other models, the proposed non-linear viscoelastic model is the most precise one in simulating the pounding-involved structural response.
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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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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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