General effective length criteria for cross‐bracing systems are formulated. The criteria entail closed‐form analytic relationships for evaluating compression brace critical load and effective length factor K with due consideration of the relative stiffness and end conditions of the tensile diagonal. Effective length spectra curves are generated to elucidate the criteria and to facilitate design application. Results indicate that the effective length is very sensitive to the relative stiffness of the two interconnected diagonals and, depending on brace end conditions, the effective length factor values range from 0.35 to 1.0. Refereed experimental data available in the range agree well with the proposed solution. Application of the criteria will lead to an optimum design and enhance overall structural stability.
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Analysis of a Three-Dimensional Tank-Liquid-Soil Interaction Problem
Author: R. Seeber, F. D. Fischer, F. G. Rammerstorfer | Size: 1 MB | Format:PDF | Quality:Original preprint | Publisher: ASME | Year: 1990 | pages: 6
A three-dimensional analysis of the dynamic behavior of liquid-filled elastic cylindrical tanks based on flexible grounds, undergoing horizontal and vertical earthquake excitation is presented. The interaction of the ideal fluid with the elastic shell and with the flexible ground yields a problem of linear potential theory which must be solved together with the equations of motion of the shell and of the ground. With the unknown modal shapes of vibration developed in Fourier and in Fourier-Bessel series, the partial differential equations are transformed into coupled generalized equations of vibration by a weighted residual approach. The results show the strong influence of the flexible ground characterized by a remarkable shifting of natural frequencies, by the existence of additional natural frequencies, and by high damping ratios.
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according to our reports, we have a lot of Muslim in our site, these days one of the holy moon of Muslims has been started, it is Ramadan. I want to congratulate this month to all Muslims, and request you pray us.
You can find more information about Ramadan here:
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Hello fellows,
I was wondering, here on the forum there are lot's of young engineers and researches.
I was curious, does anyone have any information about job possibilities in geotechnical field. For example, there is University of BBD and it looks some young researcher for some research in landslide mitigation. Something like that.
Best regards
freequo
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Advantages of Using Multichannel Analysis of Love Waves (MALW) to Estimate Near-Surface Shear-Wave Velocity
Surveys in Geophysics
Volume 33, Number 5 (2012), 841-860
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Finite-Difference Modeling and Dispersion Analysis of High-Frequency Love Waves for Near-Surface Applications
Pure and Applied Geophysics
Volume 167, Number 12 (2010), 1525-1536
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Author: James Steele | Size: 103 MB | Format:PDF | Quality:Scanner | Publisher: John Wiley & Sons | Year: November 10, 1992 | pages: 212 | ISBN: 1854901737, ISBN-13: 978-1854901736
Recent social, political and environmental upheavals have had a two-fold effect on the built environment in Third World countries. They have destroyed the traditional cultural structure in rural areas, which has led to homelessness and the marginalization of entire communities, and large-scale urbanization has become a powerful phenomenon of which the Islamic World is very much a part. Such global changes have had a dramatic impact on the jury for the Aga Khan Award for Architecture, whose selections for 1992 are presented here. The projects selected this year, which address issues relevant to both the developing and developed world, are economically sustainable, humanistic solutions to difficult problems, and generate a new architectural language. They provide a valuable insight into an alternative design approach for both rural and urban environments. Essays by Suha Ozkan of the Aga Khan Award for Architecture, Mohammed Arkoun, Professor of Islamic Thought at the Sorbonne,Paris, and Arif Hasan, Pakistani architect and planner, place the projects within the context of the major social transition now underway, and an article by the late Hassan Fathy on Contemporaneity in the City provides a historical perspective. Each award-winning project is described in detail by Charles Moore and Selma al-Radi, and they are comparatively reviewed by James Steele, and a brief history of Samarkand, where the awards were presented, completes this volume.
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In searching the forum I found that one of the main material used these days (plywood) does not have enough space.
One of the major association globally is "APA Engineered Wood Association"
I will try to put some information here.
A Short History of APA
APA — The Engineered Wood Association is the nonprofit trade association of the U.S. and Canadian engineered wood products industry. Based in Tacoma, Washington, the Association is comprised of and represents manufacturers of structural plywood, oriented strand board (OSB), structural composite panels, glued laminated (glulam) timber, wood I-joists, and laminated veneer lumber (LVL). (See the glossary backgrounder for explanation of these products.)
APA was founded in 1933 as the Douglas Fir Plywood Association to advance the interests of the burgeoning Pacific Northwest plywood industry. Adhesive and technology improvements eventually led to the manufacture of structural plywood from Southern pine and other species, and in 1964 the Association changed its name to American Plywood Association (APA) to reflect the national scope of its growing membership.
The Association’s membership expanded again in the early 1980s with the introduction of oriented strand board (OSB), a product the Association helped bring to market through development of new panel performance standards. A decade later, APA formed a related nonprofit organization now called Engineered Wood Systems (EWS) to accommodate manufacturers of non-panel engineered wood products, such as glulam timber, wood I-joists and laminated veneer lumber.
To better reflect the broadening product mix and geographic range of its membership, the Association changed its name again in 1994 to APA—The Engineered Wood Association. The acronym “APA” was retained in the name because it was so widely known and respected in the marketplace.
Today, APA and EWS represent approximately 152 engineered wood product mills in the U.S., Canada and abroad.
You can go to their web site and sign up to have access all of this and more information
Regards
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(3.4 mb)
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I need this paper for my research. I thank you share this, please.
Title: Analysis of a Three-Dimensional Tank-Liquid-Soil Interaction Problem
journal: J. Pressure Vessel Technol.-February 1990-Volume 112,Issue 1, 28 (6 pages)
Author(s): R. Seeber and F. D. Fischer
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or
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FIFA Football Stadiums – Technical recommendation and requirements
Author: FIFA | Size: 68.1 MB | Format:PDF | Quality:Original preprint | Publisher: FIFA | Year: 2011 | pages: 420
FIFA Football Stadiums – Technical recommendation and requirements 5th Edition
General Technical recommendation and requirements for Football stadiums.
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