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08-24-2012, 01:38 PM   #31
JOATMON

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Quote:
 Originally Posted by Duckweather How do you ever have time to learn all that Daniel?? You must have been the person Merlin was talking about in the Once and Future King. I think I got the grasp of most everything you say except "moment". I am sure it doesn't mean time which is what I need more of to look it up. Until then I will stick to straight framing, which I think most wanna be engineers should do, and leave the critical stuff to you.
Daniel...please correct me if I'm wrong....but this is how I remember it from my statics class........some 30 or so years ago....

Think of a torque wrench....the force you exert on the socket is the 'moment'...which is a function of the force on the wrench and how far away it is....

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 08-24-2012, 02:54 PM #32 Civil Engineer   Join Date: Mar 2009 Location: Boston Posts: 5,467 Rewards Points: 4,514 Moment and torque are identical. They are computed by multiplying the force on the arm by the distance from the arm to the pivot point, so if I have a 2 foot long torque wrench, and I apply 100 lbs of force on the end of the wrench, the moment (or torque) is 200 foot pounds. The distance often must be computed between the centroid of the applied force and the centroid of the loaded point. For example, your hand may be four inches wide, if you push down on the end of the wrench the moment is computed based on the distance from the center of your hand to the center of the bolt. In the case of multiple bolts, things get considerably more complicated, since each bolt is likely to be a different distance from the applied force, so each bolt sees different load. The key point is that each bolt sees a shear force, not a moment, so the actual force on a fastener is always resolved into a shear force except in the case of direct compression (hammer blow) or direct tension (pullout). From the point of view of the bolt, it doesn't know or care if the bolt load arises from direct shear of the framing member, moment on the framing member, or some combination of the two, the bolt always feels shear. Whether or not the bolt fails is entirely due to the magnitude of the shear, and the strength of the bolt in shear. This applies equally to nails, screws, lag screws etc.
 The Following User Says Thank You to Daniel Holzman For This Useful Post: Duckweather (08-24-2012)
08-24-2012, 10:17 PM   #33

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Thank you. You do realize giving away your secrets may make some of us more dangerous. ("A little knowledge can be dangerous") Boston. I am in southern NH, (Brentwood), You're close enough for me to put you in my list of contacts.

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