Blasting Vibrations and Their Effects on Structures
Author: Nicholls, Harry R., Johnson, Charles F., Duvall, Wilbur I. | Size: 3 MB | Format:PDF | Quality:Unspecified | Publisher: UNT Libraries Government Documents Department | Year: 1971 | pages: 110
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This report is a domestic scan focusing on practices among U.S. transportation departments (DOT) for identification, prioritization, and execution of programs for management of highway bridges. The scan includes reviews of DOT manuals, guidelines, and policy statements; a collection of responses to amplifying questions from DOTs; and travel to seven sites for meetings with DOT staff. The most detailed information was collected from 13 DOTs that participated in meetings with the scan team. Document review includes input from 11 other DOTs. All sources are state or local government agencies of the United States. The scan team observed that certain practices in current use in bridge maintenance are effective in improving overall bridge conditions. These key observations/findings are divided into three main categories: the bridge management process, preventive maintenance, and agency support. The first of these categories, the bridge management process, further touches upon four elements of an effective process: identification of maintenance needs, performance measures, prioritization, and verification. State departments of transportation were either visited, or information was obtained from them via questionnaires.
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Common Airport Pavement Maintenance Practices - A Synthesis of Airport Practice
Author: Hajek, Jerry; Hall, Jim W.; Hein, David K. | Size: 4 MB | Format:PDF | Quality:Unspecified | Publisher: Transportation Research Board | Year: 2011 | pages: 112 | ISBN: 978-0-309-14334-9
This synthesis study is intended to inform airport pavement engineers and airport maintenance managers and personnel about how airports implement a pavement maintenance management program, including inspection and tracking pavement condition, scheduling maintenance, identifying necessary funds, and treating distresses in asphalt and concrete pavements. Information used in this study was acquired through a review of the literature and interviews with airport operators and industry experts.
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Posted by: tolin - 04-25-2014, 04:31 AM - Forum: Archive
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Article/eBook Full Name: Temporary Works: Principles of Design and Construction
Author(s): Murray Grant and Peter Pallett
Edition: N/A
Publish Date: 7 Mar 2012
ISBN: 0727741772 & 978-0727741776
Published By: ICE Publishing
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Author: C. V. R. Murty Rupen Goswami A. R. Vijayanarayanan Vipul V. Mehta | Size: 4.6 MB | Format:PDF | Quality:Unspecified | Publisher: Gujarat State Disaster Management Authority Government of Gujarat | pages: 268
This book explains concepts in behaviour of buildings during earthquakes. The book dwells on basic concepts in earthquake resistant design of buildings, first describes these at a conceptual level and then articulates further with numerical examples. It is an attempt to respond to some of the frequently asked questions by Architects and Structural Engineers regarding behaviour of Reinforced Concrete (RC) and Steel buildings under the action of lateral loads, especially during earthquakes. Since most buildings built in India are made of RC, the dominant set of examples used
is of RC buildings. But, with no loss of generality, the broad concepts discussed in this document are valid for both RC and Steel buildings. Also, the discussion is limited to normal buildings without any special devices, like base isolation and other energy absorbing or dissipating devices. Also, specialised systems (like post-tensioning slab systems and nuclear power plants) are not in focus. This book employs exaggerated deformation shapes to emphasise deformations, and thereby, to develop the most needed intuition of structural behaviour of buildings during earthquakes and its consequences on earthquake-resistant design. The book contains animations related to behaviour of the various buildings models used in this work. Those readers seeing the electronic copy of this book should make special note of those pages titled Animation Set ..., to capture the hyperlinks and reach the said animations. The target audience of the book is practicing seismic structural engineers and architects, in addition to students and teachers of engineering and architecture colleges striving to understand seismic behaviour, analysis and design of buildings.
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Dear Forum member, need your help to share following paper:
Rasmus Müller, Stefan Larsson, Johan Spross. Extended multivariate approach for uncertainty reduction in the assessment of undrained shear strength in clays. Canadian Geotechnical Journal, 2014, Vol. 51, No. 3 : pp. 231-245. (doi: 10.1139/cgj-2012-0176)
Article/eBook Full Name: Primer on Seismic Isolation
Author(s): Andrew W. Taylor and Takeru Igusa
Publish Date: 2004
ISBN: 9780784475584
Published By: ASCE
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Response of Pure-Friction Sliding Structures to Three Components of Earthquake Excitation Considering Variations in the Coecient of Friction
Author: F. Khoshnoudian ; and V. Rezai Hagdoust | Size: 4.2 MB | Format:PDF | Quality:Unspecified | Publisher: Transaction A: Civil Engineering Vol. 16, No. 6, pp. 429{442 c Sharif University of Technology, December 2009 | Year: 2009 | pages: 14
In the present study, the in uence of the coecient of friction on the seismic response of sliding base isolated structures is investigated. The building is modeled as a simpli ed single-story structure resting on a group of sliding supports. The frictional forces mobilized at the sliding supports
are assumed to have a hysteretic plasticity behavior. Bilateral interaction between the sti ness of the two horizontal orthogonal directions of the isolators has been taken into consideration. The results show
that the variations of the coecient of friction in
uence the response of a sliding base isolated building.
E ects of vertical excitation on the normal and frictional forces are considered too. The inuence of the bi-directional interaction of frictional forces and vertical excitation on the response is investigated by comparing the response of the system to mono-directional (excluding vertical component and no interaction between the two horizontal orthogonal directions), bi-directional (excluding vertical component) and tridirectional earthquake excitations. It is demonstrated that the response of the sliding isolated structures is inuenced signi cantly by the bi-directional interaction of frictional forces and by incorporation of the vertical component. Further, the base shear response may be underestimated if the e ects of the vertical component are neglected and the sliding structures are designed merely on the basis of single-component or two-component excitation.
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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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