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  • Ah, I see.  I tend to think of the ASCE 7 as a balancing act between ease of implementation and economy of design, but you make a great point about the importance of transparency.  I would argue that the current live loads are very easy for engineers ...

  • While I understand the pros and cons of ASD & LRFD, once AISC combined them into one manual, the differences began to disappear to all that remains is a conversion between the two.  What is the load and what is the capacity?  Well, that depends... the ...

  • Ron, I appreciate the thorough explanation, and I'm sorry for not responding sooner.  In fact, I wish this timeline was part of my undergrad curriculum.  Only after entering practice did I realize how little I knew about ASD, and how much my understanding ...

  • James, Thanks for the response.  You make a good point, but for environmental hazards, the safety factor lives in the return period to establish uniform risk.  For example, I'm told that snow loads in ASCE 7-16 and earlier resulted in dramatically different ...

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  • Chad, Thanks for the thoughtful response.  It's certainly true that we wrap a lot of big questions into our floor loads, and it may be true that the public cares more about minimizing risk from human-imposed loads than minimizing risk due to external ...

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  • Thank you, Ron.  I'll look out for that announcement. Does anyone have an opinion either way about the IBC vs ASCE 7 approach to service wind?  Using a fixed factor is simpler, but ASCE's MRI method ties the drift check to more tangible performace objectives. ...

  • No worries; I'm glad you found the correct reference.  That's what ASCE Collaborate is for! Best of luck, ------------------------------ Christian Parker P.E., M.ASCE Structural Project Engineer Washington DC ------------------------------

  • Thanks for your response.  I'm afraid I "jumped the gun" and fired off a question due to a lack of understanding. I was following an FHWA design GoBy calc for some repairs, and they did not consider the composite section of bridge girder, only steel ...

  • Hi Daniel, Great question.  I'm not a bridge engineer, but composite design (steel beam/girder engaging a concrete slab in compression) typically assumes general yielding of most or all of the steel section rather than triggering failure at initial yield ...

  • Hi Huajie, Have you considered section 29.4.2.3?  I recognize that a house is typically not a circular tank but perhaps you'd find some useful guidance.  The notion of interpolation based on the clearance is probably something you can adapt/apply.  There's ...

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