Nail Shear Strength Test - Building & Construction - Page 3 - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction


Thread Tools Display Modes
Old 08-24-2012, 12:38 PM   #31
ddawg16's Avatar
Join Date: Aug 2011
Location: S. California
Posts: 11,485
Rewards Points: 2,124
Blog Entries: 2

Originally Posted by Duckweather View Post
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....


Even if you are on the right track, you will still get run over if you just sit there.

My 2-Story Addition Build in Progress Link ... My Garage Build Link and My Jeep Build Link
ddawg16 is online now   Reply With Quote
Old 08-24-2012, 01:54 PM   #32
Civil Engineer
Join Date: Mar 2009
Location: Boston
Posts: 5,682
Rewards Points: 4,944

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.
Daniel Holzman is offline   Reply With Quote
The Following User Says Thank You to Daniel Holzman For This Useful Post:
Duckweather (08-24-2012)
Old 08-24-2012, 09:17 PM   #33
Haverhill Trade 1965
Join Date: Mar 2012
Location: New Hampshire
Posts: 532
Rewards Points: 500

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.


Duckweather is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Need help caulking and filling nail holes in my trim hadees Painting 13 11-25-2012 10:32 PM
Hot Tub GFCI Test Button Not Tripping Breaker a2zunknown Electrical 7 08-20-2012 07:49 AM
light receptacle vs. switch test device amakarevic Electrical 5 03-23-2012 05:15 PM
nail guns and nail sizes hitman Remodeling 1 02-19-2010 12:32 PM
Vinyl Replacement Window Nail Fin turtlerouge Building & Construction 4 08-26-2009 08:41 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1