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  1. engcomp

    Take the flex out of a roof beam

    I have double-pitch roof beams spanning 24 m, the rise from support to apex being 0.5 m. Each beam is designed for ultimate moments due to wind loads and factored dead loads, and a permissible service load deflection of L/250. The owner has attached a suspended ceiling to the roof purlins. As...
  2. engcomp

    Determining Beam size?

    The first paragraph in a white paper titled "Analysis of Simply Supported Beams" states: 'A solid grasp of simply-supported beams is one of the cornerstones of an engineer's education. This is even more important when the analysis is done by computer. To know and understand the...
  3. engcomp

    Temporary wind loads

    I had a heart-stopping experience many years ago. My brief was to be the structural engineer under an architect to install new floors in a six-story city building. The documentation made it clear - in the usual manner - that the builder was responsible for stability and wind resistance during...
  4. engcomp

    TK Solver

    This kind of task is easily solved with MATHSERV http://www.engs-comp.com/mathserv/index.html For example, type in any word processor: A = {1,3,6,8,4} B = {5,6,2,3,9} C = mattranspose(B) D = matmult(A,C) print using "####"; D (this command returns a 5x5 matrix) 5 6 2 3 9...
  5. engcomp

    cracks in Masonary walls

    Hi, irulandi You say: "In Masonary works we have used solid blocks, yesterdat i found in one wall is cracked in 5m lenght and width is 5to6mm. That wall construction was over by before two months (inculding plastering) now POP applying activity in progress. ...can i go ahed for painting...
  6. engcomp

    parking garage

    Hi, fagg1 1. Live load for car parks is 3 kPa unless vehicles of more than 2.5 t tare are involved, in which case it is 5 kPa. 2. At 60m x 60m, temperature effects can be ignored except in the roof slab. 3. 60m x 60m is not too big. Additionally, you should consider impact loads amd breaking...
  7. engcomp

    In-house quality control of spreadsheets

    PHEW - this post takes some time to read. But it's worth the time - so many good thoughts. 1. Do your own manual checks. 2. Don't trust SS unless you know what they do. 3. Why don't you share your hardwon knowledge? etc. I agree with most of what's been said, having practised it myself for...
  8. engcomp

    Books on Excel for Engineering

    I have "Excel 4 for Scientist and Engineers". It has helped me a lot to program in Excel. Of course, there are probably later versions. If you go to: http://www.arealinks.net/books/windows/E.htm you might find exactly what you are looking for. Regards, Helmut engcomp@ozemail.com.au...
  9. engcomp

    Software For Design

    Hi, Andy - that's a good set of tools. Helmut engcomp@ozemail.com.au http://www.engs-comp.com/
  10. engcomp

    Software For Design

    What bothers me about the question "I am looking for a good software" is that it implies the user will rely on the output of the software without knowing how it was produced, and without some means of checking whether the output is in the right ball park. To me, this philosophy is...
  11. engcomp

    Foundations Book

    I agree with earlier comment that "Foundation Analysis and Design" by Joseph E. Bowles is excellent. If you want to see some cue cards based on this book, have alook at: http://www.engs-comp.com/mathserv/ Unfortunately, I haven't yet got around to the retaining walls section, but it...
  12. engcomp

    Steel Structures Foundation

    I have a computer program called OPT_SHED, which designs all elements of a portal frame building on the basis of cost-effectiveness. After the program determined the wind loads from your site information, it lets you choose a cladding from many alternatives - a dearer cladding requiring fewer...
  13. engcomp

    Steel Structures Foundation

    I like your philosophy, Imagineer - "design the column as if it was pinned and design the baseplate, etc. as if it were fixed" - hang the client's money. That's what clients think we do, anyway. And if something goes wrong when we are less conservative, who gets blamed? Good on you...
  14. engcomp

    Rafter load sharing

    One Australian standard that has a bearing on this question is AS 1684.1 - 1999 - Residential Timber Framed Construction: Design Criteria For RAFTERS Live loads this code states that concentrated loads and partial area loads may be factored in accordance with AS 1720.1, assuming the crossing...
  15. engcomp

    H Piles - End Bearing

    Dear Pylko I have spent a few years as a pile driving contractor, after inventing a machine that could drive recycled railway lines. Forget your Geotech's 8 tonne per square foot - it is irrelevant to driven pile capacity. The H pile sockets into the rock until the driving resistance equals...
  16. engcomp

    allowable bearing capacity+width of foundation

    Of course, if the footing carries eccentric or inclined loads, you should refer to chapter 4, section 6 ... http://www.engs-comp.com/mathserv/bowles4-6.html Helmut engcomp@pbq.com.au
  17. engcomp

    allowable bearing capacity+width of foundation

    Joseph E. Bowles discusses bearing capacities at chapter 4, section 3 of his book "Foundation Analysis and Design" 5th edition. A cue card for this chapter can be found at ... http://www.engs-comp.com/mathserv/bowles4-3.html Helmut engcomp@pbq.com.au
  18. engcomp

    How does uplift reinforcement work?

    lindsay - read my answer above! Is there any point in addressing questions on this forum when the answers are ignored? Helmut engcomp@pbq.com.au http://www.engs-comp.com/
  19. engcomp

    How does uplift reinforcement work?

    Elementary, Watson - you have a clump of concrete being torn out of the adhering ground by an uplift force, which presumably is anchored adequately into the clump. What can happen? The clump can break in two along one axis or the other. How do you prevent it? By putting reinforcement in the top...
  20. engcomp

    Stiffness Matrix Solution of Unkown Eqns.

    Dear Varun The matrix method of structural analysis is fine. The moment distribution method is from the old days when solving more than three simultaneous equations was a pain and a stepped approach was more convenient. Hardy Cross has our admiration but the method is as dead as the sliderule...

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