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  1. LowSpark

    Wood Beam Scab Repair Calculation Example

    BAretired, I think that clears everything up for me. I sincerely thank you for your detailed information and your generosity to share your knowledge with the community. You are a great asset to this forum and to Engineers as a whole. Have a great rest of your week and stay safe during these...
  2. LowSpark

    Wood Beam Scab Repair Calculation Example

    BAretired Thank you so much for taking the time to walk through all this. Its been a long time since I have done any kind of problems like this so I appreciate the patience. Your last comment about the shear clicked! You are getting the additional shear force that needs to be accounted for...
  3. LowSpark

    Wood Beam Scab Repair Calculation Example

    Thank you for submitting this. The pin action makes sense. Looking at your stable beam I am looking at the forces/moments like this:
  4. LowSpark

    Wood Beam Scab Repair Calculation Example

    ...+ 3" (to get to the center)+3"(to get away from the center) + 18" (To get to the right side bolt group center) = 42" 17,149 "#/(18"+3") + 38.11"#*42" = 2,417# 2,417#/331# = 7.3 Bolts -> 8 bolts needed on each side? But if we use 8 bolts then the center of the bolt group wouldn't be 18". I...
  5. LowSpark

    Wood Beam Scab Repair Calculation Example

    Thank you for taking the time to post this. I am going to digest this a bit later today. Thanks again!
  6. LowSpark

    Clearances to Manhole Access

    This is more of an architectural question. If you are putting something on top of the manhole, you will need to be able to get into and out of the the manhole without having the person get hurt. The building code has all sorts of requirements for stair landings, ladders, etc.
  7. LowSpark

    Wood Beam Scab Repair Calculation Example

    ...force in the midpoint (of each side) and that would give you the " # for each side? In this case 6" is the midpoint on each half, therefore, 6"*(331#*5)= 9,930"#? 9,930"# < 17,149 "# and therefore it does not work (as you said, you were able to determine this by inspection)? To get it to work...
  8. LowSpark

    Wood Beam Scab Repair Calculation Example

    See below:
  9. LowSpark

    Wood Beam Scab Repair Calculation Example

    Please bear with me while I run an example by you [bigsmile] I want to make sure I understand what you mean, so I made up some numbers and tried to solve a sample situation. See attached sample problem where I try to get the needed moment capacity of the scab repair. If I miss the mark...
  10. LowSpark

    Wood Beam Scab Repair Calculation Example

    Great insight on the mix/matching bolts/nails.
  11. LowSpark

    Wood Beam Scab Repair Calculation Example

    Not an issue in my house, just an engineering curiosity. Seems like this would be a common issue that homeowners/contractors/architects would face and was interested to see why there weren't more calculated solutions to it. I believe it is important to be a well rounded engineer crossing...
  12. LowSpark

    Wood Beam Scab Repair Calculation Example

    You lay it out pretty nicely. I was thinking of looking at the problem as an equivalent areas solution. Say you have a 2x10 that is damaged in the middle of the joist and you want to repair it. You scab on the equivalent area (another 2x10) and you do it on both sides so you don't get eccentric...
  13. LowSpark

    Wood Beam Scab Repair Calculation Example

    Hello All, I have a question as to why every example of a beam splice shows the load in tension as shown in this link: https://www.structuremag.org/?p=10652 Kootk from this forum gave the solution to use a beam splice in this thread but no calculation example...
  14. LowSpark

    # phase power LL vs LN

    Yes,the summary is very accurate. That was my question from the beginning. I know that the angle should be the same and therefore the powers be the same but by simply trying to insert the relationship off LL voltage in the equation was throwing me off because of the 30 degrees. I'm just going to...
  15. LowSpark

    # phase power LL vs LN

    You guys realize that only in delta systems does the ll current lag the LN by 30 degrees. In that calc you are throwing 30 degrees on the voltage and on the current. Either you are working with a wye system and the voltage is affected, or you are working with a delta system and your current is...
  16. LowSpark

    # phase power LL vs LN

    Here is the picture from the book: http://files.engineering.com/getfile.aspx?folder=5f08b74e-85d6-4695-aac7-a015e2f7c61a&file=Book_Excerpt.JPG
  17. LowSpark

    # phase power LL vs LN

    Consider the wye case. In a wye ll current is the same as phase current. I found the solution everyone by the way. The solution is what shooter said earlier, you need to only use phase to neutral angle as is - just because, I found it in my text book in undergrad. They specially said "take note...
  18. LowSpark

    # phase power LL vs LN

    Yes, at the end of the day the Line to Line voltage is square root three time the magnitude and 30 degrees leading. You will see this from subtracting the two vectors. But we can talk about semantics but what is important is the proof as to why you need the Line to Neutral Phase angle.
  19. LowSpark

    # phase power LL vs LN

    I think you are referring to a delta wye transformer. I was just referring to a transmission system that has a wye source and the load is connected wye. It can be easily said to only use Line to neutral phase angle, and I can accept it as it is just the way it is but it would be reassuring to...
  20. LowSpark

    # phase power LL vs LN

    Interesting reply. But I don't see why it is only the Line to Neutral Voltage angle that we are concerned about.

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