Two commonly used types of bolts are:
- High strength bolt (A325, A449, A490).
- A307 is known by names unfinished, rough, common, ordinary and machine.
- They are made of low carbon steel having tensile strength of 60Ksi.
- A325 is made of medium carbon steel whose tensile strength decreases with increase in diameter
- High strength bolts can be tightened to large tensions.
Research Council on Structural Connections (RCSC) prescribes four tightening procedures.
- Turn of the nut method
- Calibrated-wrench tightening
- Installation of alternate design bolts
- Direct-tension-indicator tightening
- In riveted connections magnitude of clamping is function of length of rivet and magnitude of shrinkage after the head is formed.
- Magnitude f slip depends on the extent to which rivet fills the hole.
Bolted & Riveted Connections
Types of Connections
- Connection transmits the force by friction produced between the faying surfaces by the clamping action f the bolts.
- Slip-critical connections are recommended for joints subjected to stress reversal, severe stress fluctuation, impact, vibration or where slip is objectionable
Bearing type connections:
- Load is transferred by shearing and bearing on the bolt.
- Capacity in shear depends on whether shear plane intersects the body of bolt or threaded portion.
Let us know in the comments what you think about the concepts in this article!