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Bolted Tension Connections

Bolted Tension Connections. Limit State: Yield or Ultimate??. Yield: 36 ksi (strain = 0.0013). Limit State: Yield or Ultimate??. 12’. 24’. Limit State: Yield or Ultimate??. P. 12’. 322” long brace. 24’. mmmm ….. Maybe we should not let it yield. P. 12’. 322” long brace. 24’.

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Bolted Tension Connections

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  1. Bolted Tension Connections

  2. Limit State: Yield or Ultimate?? Yield: 36 ksi (strain = 0.0013)

  3. Limit State: Yield or Ultimate?? 12’ 24’

  4. Limit State: Yield or Ultimate?? P 12’ 322” long brace 24’

  5. mmmm….. Maybe we should not let it yield P 12’ 322” long brace 24’

  6. mmmm….. Maybe we should not let it yield P 12’ 322” long brace 24’

  7. If we limit the stress to less than yield, then…. P 12’ 322” long brace 24’

  8. If we limit the stress to less than yield, then…. P 12’ 322.4” long brace The brace would not extend more than 0.4” (do the math: eL = 0.4”) 24’

  9. If we limit the stress to less than yield, then…. P 12’ 322.4” long brace The brace would not extend more than 0.4” (do the math: eL = 0.4”) And the column would be leaning by no more Than 0.45” (do the math: Pythagoran 24’

  10. Then again…. Yield is no where near the maximum the steel can take. P 12’ 322” long brace 24’

  11. Then again…. Yield is nowhere near the maximum stress the steel can take. P 12’ 322” long brace 24’

  12. I mean…. Even if it yields at 36 ksi, it doesn’t break, right? P 12’ 322” long brace 24’

  13. I mean…. Even if it yields at 36 ksi, it doesn’t break, right? P 12’ 322” long brace 24’

  14. It seems like yielding is no big deal P 12’ 322” long brace 24’

  15. It doesn’t break at 36 ksi (yield)Why not just say that 58 ksi (ultimate) is the limit?? P 12’ 322” long brace 24’

  16. It doesn’t break at 36 ksi (yield)Why not just say that 58 ksi (ultimate) is the limit?? P 12’ 322” long brace 24’

  17. If we limit the stress on the brace to Anything Less than Ultimate (58 ksi), then… P 12’ 322” long brace 24’

  18. If we limit the stress on the brace to Anything Less than Ultimate (58 ksi), then… P 12’ 425” long brace 132” The brace would not extend more than 103” (do the math: eL = 103”) 24’

  19. If we limit the stress on the brace to Anything Less than Ultimate (58 ksi), then… P 12’ 425” long brace 132” The brace would not extend more than 103” (do the math: eL = 103”) And the column would be leaning by about 132” (do the math: its fun, complicated) 24’

  20. Now, we’re in the world of 2nd order effects (the Statics are changed because of the huge change in geometry P 12’ 425” long brace 132” The brace would not extend more than 103” (do the math: eL = 103”) And the column would be leaning by about 132” (do the math: its fun, complicated) 24’

  21. Gravity loads will make it collapse P 12’ 425” long brace 132” The brace would not extend more than 103” (do the math: eL = 103”) And the column would be leaning by about 132” (do the math: its fun, complicated) 24’

  22. So….We DO NOT WANT THE MEMBER TO YIELD

  23. YIELD IS THE LIMIT FOR THE MEMBER

  24. But…The connection is different

  25. Around holes, a little bit of yielding is fine (holes are tiny).

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