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  1. flamby

    High water velocity over concrete

    I am doing a preliminary dam design study, where water is jetting out off undersluices at a velocity of 25-30 m/sec. Too high, and I provided heavy steel lining over the concrete surface, properly anchored. Now I am under heavy criticism and peers say, I should go for high performance/ high...
  2. flamby

    Ask the builder

    http://www.askthebuilder.com Good collection of tips and advice this guy has got on his pages. Ciao.
  3. flamby

    What whould you like to be?

    Knoxij's thread reminded me of the standard interview question "where/what whould you like to be 5 years from now?". As a deterministic individual, like all typical Indians, I have never found out the answer. All I could think with my little imaginative capacities are better salaries, home and...
  4. flamby

    Equation of rotated cylinder in 3-D

    I need to find out intersection of 2 cylinders crossing themselves. Actually this is a manhole (600 mm dia) on a 5500 mm dia pipe, but with an angle like ______//_______ _______________ If one pipe is y^2+z^2=2750 what the equation of other pipe is, considering an angle of rotation of...
  5. flamby

    This wheel is amazing!

    http://www.falkirk-wheel.com/wheel/falkirk-wheel/wheel.htm Delightful piece of engineering this! Ciao.
  6. flamby

    Excellent site

    http://mistug.tetm.tubitak.gov.tr/~bdyim/sayilar.php3?dergi=muh Looks useful and is free. Please check it out. May be half as good. Ciao.
  7. flamby

    Writing technical papers

    It was suggested in a thread that one may use one's spare time for writing technical stuff. Well, a slump is a luxury which most of you are unlikely to have. How many of you actually go out to write the papers about what you have done and get it published? Indeed it looks great on your CV and...
  8. flamby

    Post-Tensioning of Bridge Segments - Methodology

    I have a situation where a penstock (water pipe of 6m dia) is to be carried across a creek, 50m wide. I am thinking of designing a PT girder for this. Can someone suggest a "standard" erection scheme for this? I have no experience in segmental PT construction and trying to understand how to...
  9. flamby

    Flanged dish end

    The flange of a dish end for a pressure vessel application is coming out very high. I am interested in knowing the pros and cons of using a thinner flange with stiffeners all around. Is this acceptable in practice? What are real dangers of doing this as far I can show the structure is reasonably...
  10. flamby

    Sketches in Mathcad file

    I follow the method as- 1. Create the drawing in CAD. 2. Capture the image. 3. Crop, cut etc. the image in some other package eg. MS Paint. 4. Recapture the image. 5. Paste in Mathcad. After doing it so much efficiently, I wonder what others do.
  11. flamby

    Flash flood waiting to happen

    A landslide in Tibet, China has blocked the river and formed a massive reservoir. Chinese authorities have warned India that the plug can break anytime in next 48 hours. The Indian side has removed people from the affected area but many hydropower projects on the downstream face a threat, the...
  12. flamby

    ASTM A516 Gr 70 steel- changes in '01 and '04

    I do not have access to these specifications. Can someone tell me what are major changes from 2001 code to 2004 in respect of Grade 70 steel? Thanks in advance.
  13. flamby

    Hydrodynamic Suction

    According to Indian code, the hydrodynamic pressure is same, whatever the direction - positive pressure or suction. Should not the suction be limited to that of vacuum? How does water apply suction or tension on the face of a retaining wall or dam? Thanks.
  14. flamby

    Working in a family-run-business

    I am working with an engineering design cum construction company run by a family. As I grow in age and experience, I am gathering the feeling that The Family is more comfortable dealing with mediocre types as against the more technical and professional people. Almost all, without exception, in...
  15. flamby

    O-Ring for penstock bulhead (dish-end)

    Hi folks, I have to provide a 1500mm dia hemispherical bulkhead to close a penstock unit of the same size. I have already designed and fabricated a hemispherical bulhead with flanges. I specified the material of O-ring as NBR/ EPDM/ Delrin/ Peek. The whole assembly was to be tested in shop...
  16. flamby

    Hoop Stress in Spherical Shell

    Suppose a spherical shell is stressed from inside and hoop stress results. If I consider a small square on the surface of this ball, I see hoop stress in every direction. Why shouldn't these stresses be combined when we check it against allowable tension, which is a one-dimensional stress? For...
  17. flamby

    CFD analysis v/s Model Tests of hydromechanical structs

    Can CFD analysis is an alternative to model tests? The reason I ask such question because one CFD software vendor told us that we can carry out the analysis of fluid dynamics behaviour without going through actual model tests of the dam overflow spillways and gates. We design the dam...
  18. flamby

    Software for Dam Thermal Analysis

    Hi, Can you please suggest me a few names of the software that can do a thermal analysis of concrete gravity dam? I have used NISA in past but the modeling is so difficult that I do not dare attempt new jobs on it now. I am looking for a code with good GUI and good tools for modeling. Thanks...
  19. flamby

    Finite Difference vs. FEM: FLAC3D

    I have come accross a program for geotechical engineering called FLAC3D (http://www.itascacg.com/flac3d.html). It is said to be a 'Finite Difference' program. How a Finite Difference program is different from Finite Element programs that we use? Is there any special advantage of using such...
  20. flamby

    Analysis of steel truss under Uniform Load

    I am analysing a truss under UDL. Fairly simple truss but one peer said since the loads are not acting at the pinned joints, bending moment will be induced in the members and these bending stresses should add up to the axial stresses. One way to get out of this dilemma is I design the whole...

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