hi,
i have just instaled tekla 16 and when i press open aplication from analysis and desighn nothing hapens. should i open an aplication manualy or it is a problem with the tekla setup?
where can i find staad .pro?
is there any aplication that comes with tekls16 to open analysis files?
i am trying to make an analysis. can someone please help me?
thanks
Nonlinear Dynamics: Between Linear and Impact Limits
Author: Valery N. Pilipchuk
Professor (Research) Mechanical Engineering - Wayne State University
ISBN: 978-3-642-12798-4
e-ISBN: 978-3-642-12799-1
Pdf file format - 366 pages - Quality: 10
Copy of Preface:
The main objective of this book is to introduce a unified physical basis for analyses of vibrations with essentially unharmonic, non-smooth or may be discontinuous time shapes. It is known that possible transitions to nonsmooth limits can make investigations especially difficult. This is due to the fact that the dynamic methods were originally developed within the paradigm of smooth motions based on the classical theory of differential equations.
From the physical standpoint, these represent low-energy approaches to modeling dynamical systems. Although the impact dynamics has also quite a long pre-history, any kind of non-smooth behavior is often viewed as an exemption rather than a rule. Similarly, the classical theory of differential equations usually avoids non-differentiable and discontinuous functions. To-date, however, many theoretical and applied areas cover high-energy phenomena accompanied by strongly non-linear spatio-temporal behaviors making the classical smooth methods inefficient in many cases. For instance, such phenomena occur when dealing with dynamical systems under constraint conditions, friction-induced vibrations, structural damages due to cracks, liquid sloshing impacts, and numerous problems of nonlinear physics. Similarly to the wellknown analogy between mechanical and electrical harmonic oscillators, some electronic instruments include so-called Schmitt trigger circuits generating nonsmooth signals whose temporal shapes resemble mechanical vibro-impact processes. In many such cases, it is still possible to adapt different smooth methods of the dynamic analyses through strongly non-linear algebraic manipulations with state vectors or by splitting the phase space into multiple domains based on the system specifics. As a result, the related formulations are often reduced to discrete mappings in a wide range of the dynamics from periodic to atochastic. Possible alternatives to such approaches can be built on generating models developing essentially nonlinear/unharmonic behaviors as their inherent properties. Such models must be general and simple enough in order to play the role of physical basis. As shown in this book, new generating systems can be found by intentionally imposing the ‘worst case scenario’ on conventional methods in anticipation that failure of one asymptotic may point to its complementary counterpart. However, the related mathematical formalizations are seldom straightforward and require new principles. For instance, the tool developed here employs nonsmooth (impact) systems as a basis to describing not only impact but also smooth or even linear dynamics. This is built on the idea of non-smooth time substitutions/transformations (NSTT) proposed originally for strongly nonlinear but still smooth models.
On the author’s view, the methodological role of NSTT is to reveal explicit links between impact dynamics and hyperbolic algebras analogously to the link between harmonic vibrations and conventional complex analyses. In particular, this book gives the first systematic description for NSTT and related analytical and numerical algorithms. The text focuses on methodologies and discussions of their physical and mathematical basics. Detailed applications are mostly excluded from this book, however, necessary references on journal publications are provided.
Short description:
Nonlinear Dynamics represents a wide interdisciplinary area of research dealing with a variety of “unusual” physical phenomena by means of nonlinear differential equations, discrete mappings, and related mathematical algorithms. However, with no real substitute for the linear superposition principle, the methods of Nonlinear Dynamics appeared to be very diverse, individual and technically complicated. This book makes an attempt to find a common ground for nonlinear dynamic analyses based on the existence of strongly nonlinear but quite simple counterparts to the linear models and tools. It is shown that, since the subgroup of rotations, harmonic oscillators, and the conventional complex analysis generate linear and weakly nonlinear approaches, then translations and reflections, impact oscillators, and hyperbolic (Clifford’s) algebras must give rise to some “quasi impact” methodology. Such strongly nonlinear methods are developed in several chapters of this book based on the idea of non-smooth time substitutions. Although most of the illustrations are based on mechanical oscillators, the area of applications may include also electric, electro-mechanical, electrochemical and other physical models generating strongly anharmonic temporal signals or spatial distributions. Possible applications to periodic elastic structures with non-smooth or discontinuous characteristics are outlined in the final chapter of the book.
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Concrete and Clay Roof Tile Installation Manual for Moderate Climate Regions
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The Roof Tile Institute, formerly the National Tile Roofing Manufacturers Association (NTRMA), has realized the need to establish an industry based manual that would cover the installation of concrete and clay tile as a roof assembly in the moderate climate regions of North America. The Roof Tile Institute in partnership with the Western States Roofing Contractors Association (WSRCA) assembled a task group to develop a single manual that would provide a representation of the best installation practices, industry standards, and code requirements. These recommendations have provided successful installations of roof tile which endured the test of time.
These recommendations are meant for areas with moderate climates that may experience occasional storms. In locations where the January mean temperature is 30 deg. F (-1 deg C) or less or where ice damming can occur, the RTI /WSRCA suggests reference to the Concrete and Clay Tile Roof Design Criteria Manual for Cold and Snow Regions. While generally considered the minimum standard, proper adherence to these recommendations and attention to detail and workmanship provide a functional roof in all but the most severe conditions. Local building officials should be consulted for engineering criteria or other special requirements.
This manual provides the minimum design recommendations with optional upgrades for the installation of underlayment, flashings, fastening and related measures to provide a weather resistant roofing assembly for concrete and clay tile.
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Introduction to Numerical Geodynamic Modelling Taras Gerya
Introduction to Numerical Geodynamic Modelling
Taras Gerya
Cambridge University Press - 2010
ISBN: 0521887542
358 pages PDF 5,3 MB
Numerical modelling of geodynamic processes was predominantly the domain of high-level mathematicians experienced in numerical and computational techniques. Now, for the first time, students and new researchers in the Earth Sciences can learn the basic theory and applications from a single, accessible reference text. Assuming only minimal prerequisite mathematical training (simple linear algebra and derivatives) the author provides a solid grounding in basic mathematical theory and techniques, including continuum mechanics and partial differential equations, before introducing key numerical and modelling methods. 8 well-documented, state-of-the-art visco-elasto-plastic, 2-D models are then presented, which allow robust modelling of key dynamic processes such as subduction, lithospheric extension, collision, slab break-off, intrusion emplacement, mantle convection and planetary core formation. Incorporating 47 practical exercises and 67 MATLAB examples
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this textbook provides a user-friendly introduction for graduate courses or self-study, encouraging readers to experiment with geodynamic models.
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Chemicals used for treatment of water intended for human consumption
BS EN 939-2009 Chemicals used for treatment of water intended for human consumption — Hydrochloric acid
BS EN 938-2009 Chemicals used for treatment of water intended for human consumption —Sodium chlorite
BS EN 936-2006 Chemicals used for treatment of water intended for human consumption — Carbon dioxide
BS EN 902-2009 Chemicals used for treatment of water intended for human consumption —Hydrogen peroxide
BS EN 901-2007 Chemicals used for treatment of water intended for human consumption Sodium hypochlorite
BS EN 900-2007 Chemicals used for treatment of water intended for human consumption Calcium hypochlorite
BS EN 899-2009 Chemicals used for treatment of water intended for human consumption Sulfuric acid
BS EN 898-1998 Chemicals used for treatment of water intended for human consumption Sodium hydrogen carbonate
BS EN 15030-2006 Chemicals used for treatment of water intended for human consumption -Silver salts for the conservation of drinking water for intermittent use
BS EN 15029-2006 Products used for treatment of waterintended for human consumption — Iron (III) hydroxide oxide
BS EN 1406-1998 Chemicals used for treatment of water intended for human consumption. Modified starches
BS EN 13754-2009 Products used for treatment of water intended for human consumption —Bentonite
BS EN 13753-2009 Products used for treatment of water intended for human consumption — Granular activated alumina
BS EN 13752-2009 Products used for treatment of water intended for human consumption —Manganese dioxide
BS EN 12933-2000 Chemicals used for treatment of water intended for human consumption - Chemicals for emergency use - Trichloroisocyanuric acid
BS EN 12915-2-2009 Products used for the treatment of water intended for human consumption — Granular activated carbon Part 2 Reactivated granular activated carbon
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Hi every body,
I have a problem in IDE-CAD programe , which is ;
After i install the programe , and run it a msg show says " this programe can't run on this operating system".
P.S: I have Windows Vista...and i tried ide-cad version 5 and 6 ,but the same problem.
Posted by: tynhanh - 10-25-2010, 03:05 AM - Forum: Archive
- No Replies
Measurement of Soil Properties in the Triaxial Test
Authors: Alan Wilfred Bishop, D.J. Henkel
Hardcover: 190 pages
Publisher: Hodder Arnold; 2nd Revised edition edition (1 Jan 1976)
Language English
ISBN-10: 0713130040
ISBN-13: 978-0713130041
Recommendation of RILEM TC 176: Test methods of frost resistance of concrete
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I strongly request to be corrected if I am wrong on the observations below:
I realised some issue with ETABS but did not go much into its intricacies. Its mathematical though not that much,the simple type,just units conversion.
Lets say our working units are KN-m, this means that approximately i may use 25KN/cubic metre and 2.54 ton/cubic metre as the unit weight and unit mass respectively for reinforced concrete.
Now if you open a new file with KN-m as your working units, and go to define Material properties, you will notice that by default the unit weight is 23.5616KN/cubic metre and unit mass as 2.4007.....(here meaning that unit weight/9.81=unit mass).
Now i would want to assume that 2.4007 is actually ton/cubic metre. But then i go ahead and make a further check. What would this be? I go into the calculator mode of ETABS by shift clicking to access the calculator. Here i change my units temporarily to ton-m. I then enter a value of 2.54 ton/cubic metre, and calculate and then OK the results. Surprisingly, i find that the the unit weight and unit mass are actually the same value. I am still not satisfied cause i feel this should be the correct input but requires more confirmatory testing. I then exit the forms and change my working units for the entire project to ton-m. Now here comes the catch!!!! ETABS defaults the value of unit mass to 0.2448 ton/cubic metre.
Observations
Defaulted inputs are not correct as expected.
Conclusions
ETABS or any other program Users should not take default values for granted. Check them and see if they are correct. If you doubt them, consult. CivilEA is there to help!!
Full-size testing to determine stress concentration factors of dragline tubular joints
Engineering Structures 31 (2009) 43-56
A b s t r a c t
This paper describes the determination of stress concentration factors (SCFs) of dragline tubular joints
through laboratory testing of four full-size dragline tubular joints. Strip gauges are installed both outside
and inside the footprint of the joints to measure stress distribution at the weld toe and weld root.
Measurements for SCF are carried out for two load cases, i.e. tension or compression forces in the main
chord alone and tension or compression forces in the vertical bracings alone with reaction forces in the
inclined braces. The relationship of the SCF between the corresponding weld toes and weld roots are
presented in the paper. The weld profile and weld root gaps that have been measured using the silicon
imprint technique and feeler gauges, provide valuable information for future FE simulation and weld root
failure study using the effective notch stress approach.
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