Tiêu đề 5.5 _ 5.6 Steel Structure, Masonry & Timber.pdf ✅

1 | P a g e 5.5 Steel Structures Design of bolted and welded connection Bolted Connections  A bolt is a metal pin with a head formed at one end and shank threaded at the other in order to receive a nut. On the basis of load transfer in the connection bolts are classified as: (a) Bearing Type (b) Friction Grip Type
2 | P a g e Specification for bolting 1. Nominal diameter = diameter of shank 2. Standard clearance pg. 73 IS 800:2007 Diameter of hole = nominal diameter of bolt + standard clearance 3. Pitch of bolts(P) pg. 73/74 IS 800:2007 Center to center distance between two bolts along the direction of loading Minimum pitch = 2.5*dia. of bolt Maximum pitch = 32t or 300mm, whichever is less 4. Gauge distance(g) C/c distance between two bolts along the transverse direction of loading 5. End distance pg 74 clause 10.2.4 Distance of bolt from the edge of plate along the direction of loading. (x) 6. Edge distance pg 74 clause 10.2.4 Distance of bolt from the edge of plate along the transverse direction of loading. (y) Minimum distance = 1.7* diameter .of hole (do) Maximum distance = 12t Where, = (250 fy ) ^1/2, t= thickness of thinner plate 7. Efficiency = strength of joint (bolt value) strength of solid plate *100 8. Number of bolts = factored load on bolts bolt value
3 | P a g e Design capacity of bolt( Bolt value) The design capacity of bolt is minimum of a) Design shear capacity b) Design Bearing Capacity Design shear capacity (pg 75, clause 10.3.3) Vdsb = Vnsb / mb Where, mb = partial safety factor for bolts = 1.25 (pg 30, table 5) Vnsb = nominal shear capacity of bolt = fub 3 × (nnAnb + nsAsb) Where, fub = ultimate tensile strength of a bolt nn = number of shear planes in which thread of a bolt lies. Anb = Net shear area of bolt Asb = Sectional area of shank of bolt ns = number of shear planes in which thread of bolt does not lies.
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