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  Traffic-induced ground vibrations (time history data)
Posted by: Grunf - 06-28-2011, 06:15 AM - Forum: Free Discussion - No Replies

Traffic-induced ground vibrations

-time history data-



Friends,

I made digitalization of 4 scanned time history records. Firstly I made the digitalization for myself but I decided to share this data with you as well to help you in your research/ teaching or engineering in general. I'd be more than happy if you make some comments (good or even bad) regarding this work I made. If some of you think this job is worthless I'd be happy to know that because I plan to use those TH's in making my seminar work and some kind of research. Just please, with every comment I expect full explanation “why” and “why not”. Don't just say "this data is bad"!! It took me 6 days to make digitalization of those 4 THs', so at least you can make full comment.

Data provided here has to be used along with the article "Building vibration to traffic-induced ground motion" written by Hong Haoa, T.C. Anga, Jay Shenb that can be found here:

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or can be downloaded here:

.pdf   Building vibration to traffic-induced ground motion.pdf (Size: 929.67 KB / Downloads: 41)

All the info concerning the THs’ I didn’t type here, you can find in the article!



Keywords of this post:
building, vibration, traffic-induced, ground motion, time history, ground acceleration, motorcycle, truck, bus, light vehicle



Idea:
Due to lack of this kind of data I needed badly and due to lack of equipement for doing real-time measuring of traffic-induced ground motion in my surroundings, I used some assumption and made "artificial" time histories. It's obvious that there just can't be two the same nor even two similar THs' taken on the same location and with the same traffic. Those THs' I provided for you are not "perfect" nor the same ones taken by the authors of the article but anyways now you have something for free and something you don't have to make on your own and waste your time. I believe those THs' are good for study and learning things. If you are going to use those THs' for making some serious calculations, do so at your own risk!



How it's made:
Article THs' are zoomed to 280% in Adobe reader, and the screenshots are taken. Those screenshots are copied to AutoCAD and scaled to make the TH fit the line 20 units of measure long (e.g. 20 millimeters long) - so one second equals one millimeter. THs’ (0,0) point of coordinate system was set to overlap the (0,0) of the AutoCAD just to make easier reading of the data (length of ordinates). The 20 second “long” line was divided into 400 segments. Vertical lines were drawn from each of the points defining the line segment. Those vertical lines were drawn in a way to cover the closest and highest peak of the TH. When I had all the segment points covered, I measured each of the vertical lines length and saved it into the excel spreadsheet. Each excel spreadsheet line contains 10 peeks (i.e. we have 10 columns in excel spreadsheet), thus we have 40 rows in excel spreadsheet which equals 400 points of TH. When all the peeks were entered to excel spreadsheet, I measured the absolute highest peak and two random peeks in AutoCAD and compared them to the original values provided in the article. Then I calculated the multiplier which will be used to convert data in excel spreadsheet to match the data in article. When this part of job was done all the data from excel spreadsheet was copied to some .txt file I newly created. To be sure the job was made as properly as possible; I imported the .txt file into SAP2000 to make time history function. Then I rechecked those previously random measured peeks (which matched almost perfectly). I made one more (maybe stupid) check; I took the screenshot of the SAP2000 window displaying TH and paste it to PowerPoint, cropped the screenshot so the TH is the only visible part of the screenshot. Then I copy-pasted the "original" TH screenshot used in AutoCAD to the same PowerPoint file and used option “Set transparent color” over it to remove the white color from the screenshot. I cropped the "original" screenshot, rescale it and moved over the SAPs' TH - the matching was almost perfectly. Do remember I was doing 3 time check per every 10 to 20 points entering to excel spreadsheet taken from AutoCAD just to be sure I didn't skip some of the data and to be sure I haven't made some other mistake in making the digitalization.


The "test" of aaccuracy:
[Image: 13985324863696980269.jpg]

Error I made when making digitalization:
[Image: 29645262139477592453.jpg]



[Image: Download.png]

Four heavy trucks TH:

.txt   Four heavy trucks TH.txt (Size: 3.38 KB / Downloads: 17)
Many cars and motorcycles TH:

.txt   Many cars and motorcycles TH.txt (Size: 3.38 KB / Downloads: 13)
One bus and one truck TH:

.txt   One bus and one truck TH.txt (Size: 3.4 KB / Downloads: 14)
Three light goods vehicles and two trucks TH:

.txt   Three light goods vehicles and two trucks TH.txt (Size: 3.42 KB / Downloads: 16)





With regards,
Grunf

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  BS 5606-1990 Guide to Accuracy in building
Posted by: ir_71 - 06-28-2011, 04:14 AM - Forum: British Standards (BS) - Replies (1)

BS 5606-1990 Guide to Accuracy in building

Author: Technical Committee BDB/4 | Size: 1.2 MB | Format: PDF | Publisher: BSI | Year: 1999 | pages: 56 | ISBN: 0580186571

[Image: 46996612473963214947.jpg]


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This British Standard guide explains and gives examples of principles that relate to accuracy in building construction. It is intended to be applied to building rather than civil engineering works and aims to assist in the following:
a) avoiding or resolving problems of inaccuracy or fit by assessing the dimensional needs of a design regarding tolerances, and then designing and specifying appropriately;
b) assessing the likely achievement of tolerances specified for a particular project, and giving guidance on their realization;
c) monitoring and controlling work during construction to ensure that it complies with
specified accuracy.
Appendices give information relating to site surveys, examples of the calculation of tolerances, characteristic accuracy values, and data from the BRE survey (see the introduction).
NOTE The titles of the publications referred to in this standard are listed on the inside back cover.

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  HEC-RAS
Posted by: asghar - 06-27-2011, 07:51 PM - Forum: Archive - Replies (1)

Dear all:
I want to Study river by HEC-RAS.if some one has book,journal and papers,I need these materials.
Thanks in advance

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  Water Purification and Management
Posted by: ska51 - 06-27-2011, 06:45 PM - Forum: Environmental Engineering - Replies (2)

Water Purification and Management (NATO Science for Peace and Security Series C: Environmental Security)

Author: José Coca-Prados (Editor), Gemma Gutiérrez-Cervelló (Editor) | Size: 4.9 MB | Format: PDF | Publisher: Springer | Year: 2010 | pages: 230 | ISBN: 9048197740

[Image: 29897121117983231146.jpg]


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Product Description:

One of the major challenges for many Mediterranean and other countries is finding viable solutions to tackle water shortage. Some of the major water quality constraints derive from the high salinity of groundwater and from pollution sources such as: untreated domestic sewage, fertilizers and pesticides from irrigation drainage, industrial effluents, and solid waste disposal. Wastewater treatment processes involving physico-chemical and biological treatment, chemical oxidation, membrane technologies, along with methods of solids concentration and disposal are of special relevance in dealing with these problems. This volume contains selected lectures presented at the NATO ADVANCED TRAINING COURSE held in Oviedo (November 15-21, 2009) and sponsored by the NATO Science for Peace and Security (SPS) Programme. They cover a variety of topics from wastewater treatment methods to cleaner production strategies, as a careful management of water resources is the basis for sustainable development and to avoid potential security threats. The reader will benefit from a general view of some of the operations involved in wastewater treatment and solid concentration and disposal methods. A proper water reuse and recycling, together with efficient solid disposal, would contribute to a better use of the resources and a sustainable economic growth, particularly in many arid lands of the world.

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  Excel macro to import CSI section catalog pro
Posted by: LiviuM - 06-27-2011, 04:12 PM - Forum: Engineering Spreadsheet - Replies (4)

Size: 0.78 MB


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Worksheet that contains macro to import CSI section catalog files *.pro file extension. It's work in progress so please contact me if you find any bugs or wish to add information.
Simply click Import button choose a file like euro.pro click ok.

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  An Alternate Method for Design of Reinf. Concr. Flex. Members
Posted by: odiclas - 06-27-2011, 03:49 PM - Forum: Journals, Papers and Presentations - No Replies

‪An Alternate Method for Design of Reinforced Concrete Flexural Members‬

Author: Shan Somayaji | Size: 3.9 MB | Format: PDF | Publisher: Conrad P. Heins, PERGAMON PRESS | Year: 1982 | pages: 11 | ISBN: +++

[Image: 49337722213649800238.jpg]


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This article was taken of the civil engineering for practicing and design engineers (JOURNAL) Vol, Number 2, 1982.
It was scanned with high quality.

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  Nonlinear time dependent design and analysis of slender reinforced concrete columns
Posted by: galcik - 06-27-2011, 02:32 PM - Forum: Archive - Replies (1)

I am looking for this book

Nonlinear time dependent design and analysis of slender reinforced concrete columns
from Ka Wai Lee

thanks

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  Equivalent steel profile Chinese x USA
Posted by: Dell_Brett - 06-27-2011, 01:12 PM - Forum: Free Discussion - Replies (7)

Dear friends,

I need a equivalent table about Chinese Structural Steel profile (HW 100×100~400×400; HN 400×200~900×300; HM 150×100~600×300) and the equivalent American or European profiles.

Any help will be appreciated!

Thanks in advance

Dell Brett

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  Drinking Water Treatment: Focusing on Appropriate Technology and Sustainability (Stra
Posted by: ir_71 - 06-26-2011, 06:18 PM - Forum: Water & Hydraulic Engineering - Replies (1)

Drinking Water Treatment: Focusing on Appropriate Technology and Sustainability (Strategies for Sustainability)

Author: Chittaranjan Ray | Size: 7 MB | Format: PDF | Publisher: Springer | Year: 2011 | pages: 300 | ISBN: 9400711034

[Image: 66070414011038588672.jpg]


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Sustainable technologies for water supply are urgently needed if water has to be supplied to billions of less fortunate people with inadequate access to water. These technologies must be simple, less expensive, less energy intensive, and easy to maintain for their adaptation among the poor masses.
Four appropriate technologies are discussed here: solar pasteurization, membrane desalination, natural filtration (riverbank filtration), and solar distillation. Solar pasteurization can be a useful means of producing water at remote, but sunny locations where fuel may not be easily available for boiling water. Membrane desalination will remain as a viable means of drinking water production for individual households to large communities. Various membrane filtration techniques as well as the means to “democratize” membrane filtration have been presented. Riverbank filtration is a “natural” filtration technique where drinking water is produced by placing wells on the banks of rivers. The riverbed/bank material and the underlying aquifer act as natural filters to remove pollutants from river water. Solar distillation can be a viable method of drinking water production for individual households to small communities without the input of external energy. Sustainability framework and technology transfer are discussed through transdisciplinary analysis.

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  Nonlinear Deformable-body Dynamics
Posted by: ir_71 - 06-26-2011, 06:07 PM - Forum: Mechanics & Material Technology (Elasticity, Plasticity and Nonlinearity) - Replies (1)

Nonlinear Deformable-body Dynamics

Author: Albert C. J. Luo | Size: 15.7 MB | Format: PDF | Publisher: Springer | Year: 2010 | pages: 430 | ISBN: 3642121357

[Image: 16442270967592866937.jpeg]


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"Nonlinear Deformable-body Dynamics" mainly consists in a mathematical treatise of approximate theories for thin deformable bodies, including cables, beams, rods, webs, membranes, plates, and shells. The intent of the book is to stimulate more research in the area of nonlinear deformable-body dynamics not only because of the unsolved theoretical puzzles it presents but also because of its wide spectrum of applications. For instance, the theories for soft webs and rod-reinforced soft structures can be applied to biomechanics for DNA and living tissues, and the nonlinear theory of deformable bodies, based on the Kirchhoff assumptions, is a special case discussed. This book can serve as a reference work for researchers and a textbook for senior and postgraduate students in physics, mathematics, engineering and biophysics. Dr. Albert C.J. Luo is a Professor of Mechanical Engineering at Southern Illinois University, Edwardsville, IL, USA. Professor Luo is an internationally recognized scientist in the field of nonlinear dynamics in dynamical systems and deformable solids.

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