What are the acceptable bolting methods per AISC?
What are the acceptable bolting methods per AISC?
There are four acceptable installation methods to obtain the pretension values for bolting: turn-of-nut method (with or without match marking), calibrated wrench method, twist-off-type tension-control bolt method and direct tension indicator method. Each of these methods is assumed to be used independent of the others.
What is the RCSC specification?
This is a widely used specification which governs the design of bolted joints and the installation and inspection of fastener assemblies in structural steel connections.
What are two common structural steel bolting methods?
Two standard bolting methods are:
- Turn of nut method. This method involves turning the nut or bolt of a fastener assembly a specific angle that is based on the length and diameter of the fastener, while at the same time making sure the unturned element doesn’t rotate.
- Calibrated wrench method.
How do you pre tension a bolt?
Easy Ways to Determine Bolt Preload
- Use a Torque Wrench to Reach Optimal Torque.
- Use Preload Indicating Washers.
- Use Direct Tension Indicating Washers.
- Use Silicon Direct Tension Indicating Washers.
- Tighten Until Snug, and Then Tighten “X” Degrees.
Why are bolts installed upside down?
No. There is no requirement governing the entering direction of the bolt. Some people feel that bolts should be installed with the head up, so that a loosened bolt will not fall from the hole. However, a falling nut is nearly as dangerous as a falling bolt and a bolt without a nut should not be relied on to carry load.
What is RCSC?
Roman Catholic Syrian Christian (RCSC): an incorrect but colloquial name for members of the Syro-Malabar Catholic Church; an Eastern Catholic church based in Kerala, India.
What does snug tight mean?
Snug tight is defined by the AISC/RCSC as when all the plies in a connection have been pulled into firm contact by the bolts in the joint, and the bolts have been tightened sufficiently to prevent removal of the nuts without a wrench.
What is structural bolting?
Structural bolts are specifically designed for use with heavy hex nuts in the connection of structural members (as opposed to tapped holes). The nuts for structural connections shall conform to ASTM A563 or ASTM A194. The following chart will assist in proper structural nut selection.
Does direction of bolt matter?
