Slide 1
RIVETED AN BOLTED CONNECTIONS
Stress-Strain Curve for Mild Steel
SSC-Mild Steel
OAB - PROPORTIONAL. A - Limit of proportionality. B - Elastic
limit.C,C - Upper and lower yield points.CD - Plastic Yield.DE -
Strain hardening zone. E - Ultimate stress.EF - Ultimate strength.
F - Breaking stress.
Classification of cross-sectionsPlastic (Class 1) Plastic
hinges, plastic mechanismConsiderable ductilityIntermediate
frames-plastic collapse mechanismStress distribution-
rectangularCompact (Class 2) Develop plastic MR, inadequate plastic
hinge rotation capacity for formation of plastic mechanism before
bucklingFully plastic stress distribution inadequate ductilityAll
structural elementsStress distribution- rectangularSemi-compact or
Non-compact (Class 3) Extreme fiber in compression can reach yield
stress, cannot develop plastic MR due to local bucklingYield
stresses reach some parts of compression elementsplastic stress
distribution partly possibleSections used in elastic designStress
distribution- triangularSlender (Class 4)
Local buckling before attaining yield stress
Used in cold-formed membersLimit StatesLimit state of strength
Loss of equilibrium and stability. Excessive deformation , fatigue,
brittle facture, stress concentration. Limit state of
serviceabilityDeformationsVibrations in structureCorrosionFire
Design for economySimplicityMinimum member of elements in the
connectionReducing the number of members meeting at the
connections
Partial Safety factors
Load (Qd) = f * Qc f partial safety factor acc to Table 4 of
IS:800-2007
Strength factor m = Su / sd m partial safety factor acc to Table
5 of IS:800-2007
TYPES OF CONNECTIONS
RIVETED CONNECTIONS
L11 Bolt Connection.pdf
L11 Bolt Connection.pdf
BOLTED CONNECTIONS
L11 Bolt Connection.pdfAdvantagesSpeedy constructionLess skilled
personsLess over all construction compared with riveted
connections
DisadvantagesLoss in tensile strength- reduced thread area and
stress concentrationVibrations make bolts loose
Classification of bolted connectionsBased on forceResultant
force transferConcentric connectionsEx-tension and compression
membersEccentric connectionsEx-bracket connectionsSubjected to
momentsEx-beam columns in framed structures
Based on type of force
Shear connections- load transfer through shear- ex lap, butt
jointTension connections- load transfer through tension on bolts-
ex hanger connectionsCombined Shear+Tension connections- ex
bracings
Based on force mechanismBearing type- bolts bear against holes
to transfer force.Ex-slip type connectionsFriction type- transfer
of force by friction between plates.Ex-slip critical
connections
Types of BoltsUnfinished ( Black)boltsFinished (Turned)
boltsHigh strength friction grip (HSFG) bolts
Types of bolted jointsLap jointButt joint
Failures in bolted jointsShear failure of boltsBearing failure
of boltsBearing failure of platesTension failure of boltsTension or
tearing failure of platesBlock shear failure
AECT250-Lecture 12.pdf
Prying forces
Pitch, Edge DistanceTHANK YOU
