Great explanation of how to compute the moment from the design seismic force (as outlined in chapter 13) to then obtain tension which I've seen neglected, but essential for ACI 318 anchor design in chapter 17. I'm happy to see people out there passionate about the process and mentoring folks!
Came across this video and your other one on ASCE 7 Ch. 13 while trying to better understand sizing of anchors for seismic restraint. They were both helpful. Can you explain why you wouldn't use the weight of the component applied at the center of gravity when summing the moments to find the tension reaction at the anchor?
2/3 Height is used when the Center of Mass information is not available. In your case, if you have the center of mass given by the manufacturer, you'll more accurate results. 2/3 height is typically considered to be a conservative assumption when the Center of Mass is not defined.
@@zachhope1038 : It may not have been mentioned in this video. If you're in a crunch for your design, then include your dead load, but once you do that you'll need to follow the code section ASCE7-16 13.3.1.2 "The component shall be designed for a concurrent vertical force +/- 0.2 x Sds Wp" Therefore if you conservatively ignore the dead load, you don't need to take this component. Hope that helps... This gets into more of SE type question =)
@@roypoomiwatracanont7762 That does help. Thanks for taking the time to respond. There will be an SE evaluation each specific application. I just wanted to have a better understanding how the sizing is done.
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Great explanation of how to compute the moment from the design seismic force (as outlined in chapter 13) to then obtain tension which I've seen neglected, but essential for ACI 318 anchor design in chapter 17. I'm happy to see people out there passionate about the process and mentoring folks!
Came across this video and your other one on ASCE 7 Ch. 13 while trying to better understand sizing of anchors for seismic restraint. They were both helpful.
Can you explain why you wouldn't use the weight of the component applied at the center of gravity when summing the moments to find the tension reaction at the anchor?
2/3 Height is used when the Center of Mass information is not available. In your case, if you have the center of mass given by the manufacturer, you'll more accurate results. 2/3 height is typically considered to be a conservative assumption when the Center of Mass is not defined.
@@roypoomiwatracanont7762 Thanks for the reply. Is the dead load of the component not factor when finding the tension at the anchor?
@@zachhope1038 : It may not have been mentioned in this video. If you're in a crunch for your design, then include your dead load, but once you do that you'll need to follow the code section ASCE7-16 13.3.1.2 "The component shall be designed for a concurrent vertical force +/- 0.2 x Sds Wp" Therefore if you conservatively ignore the dead load, you don't need to take this component. Hope that helps... This gets into more of SE type question =)
@@roypoomiwatracanont7762 That does help. Thanks for taking the time to respond. There will be an SE evaluation each specific application. I just wanted to have a better understanding how the sizing is done.