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  1. CivilSigma

    Shear strength of fastener in plywood

    Why don't you just calculate the governing lateral capacity from the equations in section 12.3 of the NDS? You have the properties of the wood (such as as the G value and thickness) and that of your fastener (yield strength, diameter). So set up an excel sheet, and plug and chug. Verify your...
  2. CivilSigma

    Bridge Wind Load Analysis - Calculate moment on steel beam flange

    Agreed... but who said anything about exams :censored: On a serious note, bridges are not my specialty, so thank you for your help. Understood. So, there's no load sharing with the shielded beams' top flanges, even though they are all connected into the diaphragm? So, there will be no moment...
  3. CivilSigma

    Bridge Wind Load Analysis - Calculate moment on steel beam flange

    Hi Folks, I need help calculating moments from wind load on the top and bottom flanges of steel bridge beams. Attached is a problem statement to calculate the maximum bending moment in the top and bottom flanges of the beam. My approach was: 1. Find wind load tributary to top and bottom...
  4. CivilSigma

    AISC Chapter I - Composite Section: Stress and Strain Distribution in Composite Section

    Thank you for this ! What book is the diagram from ?
  5. CivilSigma

    AISC Chapter I - Composite Section: Stress and Strain Distribution in Composite Section

    So this is a miracle in AISC ? Fine I won't question it :ROFLMAO:
  6. CivilSigma

    AISC Chapter I - Composite Section: Stress and Strain Distribution in Composite Section

    I'm studying the design of composite members (concrete deck over wide flange steel beam). Per AISC we typically we design the PNA to be in the steel section (either flange or web) by choosing a stud connection capacity less than 100% of either the AsFy or 0.85fcb. Lets say we chose studs to...
  7. CivilSigma

    Combined pad and strip foundation

    The idea behind adding a strip beam between two footing pads is that, due to the added beam stiffness, you can assume an equal pressure distribution under each pad of q= (Point Load 1 + Point Load 2 + Self weight all elements) / (A1 + A2) (q=0 under beam). With the pressure distribution...
  8. CivilSigma

    Lateral load path : Wood beam to wood shear wall

    Thank you all. So, what this detail shows is a transfer beam carrying a partial height wall above. The beam also supports some roof joists that bear on an exterior wall. So, my intent is to drag the lateral load from this beam (DL x CS) into an adjacent shear wall. @Aesur: Yes, drawing is to...
  9. CivilSigma

    Lateral load path : Wood beam to wood shear wall

    Hi everyone, I have a low beam/HDR that supports a partial height wall above, and I want to detail the transfer of lateral load from this beam into an adjacent shear wall. Please see the attached detail. Wall top plates are continuous, bottom plates discontinuous. So I need to transfer shear...
  10. CivilSigma

    NCEES Beam Design Aid Table

    Celt83 thank you so much !
  11. CivilSigma

    NCEES Beam Design Aid Table

    Hi folks, Page 69/133 of the NCEES PE SE Handbook is a deign aid table to the flexural design of concrete beams. How do you read this table? What is the top row? Side row? For example if: Mu/(phi * b*d^2*fc) = 0.195, how do you use the table to obtain w? I can calculate it using the equations...
  12. CivilSigma

    ASCE41-17: What are m-factors?

    Thank you very much, I found what I was looking for.
  13. CivilSigma

    ASCE41-17: What are m-factors?

    Section 7.4.1.3.1 asks you to calculate the seismic base shear using factors C1C2. C1C2 can be found in table 7-3, but this table requires the value of m_max. M_max by definition of the code is the largest m-factor for all primary elements of the building in the direction under consideration...
  14. CivilSigma

    SAFE - Area Loss Error

    Hey Everyone, I've been modeling slabs in SAFE, and each time I am getting area load loss errors. Some times the value of the loss is positive or negative. I've made sure that I am not placing load over openings by investigating the shells causing the loss. I haven't found any explanation on...
  15. CivilSigma

    Development or splice length of reinforcement ?

    Kootk, thank you very much. I will study this paper and report back.
  16. CivilSigma

    Development or splice length of reinforcement ?

    Hi everyone, I am having a hard time understanding when to specify "development" or "splice length" in reinforced concrete design. I understand that: Development lengths are specified to prevent slippage failure, and transfer stress from reinforcement into concrete. Splice lengths are...
  17. CivilSigma

    Eng-Tips Salary Survey

    Hi Everyone, I am four years into my career as a structural engineer, and to be frank I am un happy with my salary. I currently make $70 000 CAD working for one of the "big" consulting companies. I am an EIT, and expect my P.Eng by the end of summer. My peers working in the public sector easily...
  18. CivilSigma

    Elastic Structural Analysis followed by plastic member capacity design

    Something has been bothering me about principles of steel structure analysis and design... In the design of beams for example, if I am intending to use a section's plastic capacity (Mrp), can I compare that to the Mfy obtained from elastic analysis? Or do I need to perform plastic analysis of...
  19. CivilSigma

    Relative Lateral Stiffness of Braced Frames

    I'm just getting started with seismic design. Are you aware of any books with reference to Canadian code? I guess it wouldn't matter too much, as the ideas for design and analysis carry over from the US to Canada?
  20. CivilSigma

    Relative Lateral Stiffness of Braced Frames

    @dold, do you recommend the text book you referenced? Does it include chapters on the design of braces or other elements ?

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