Design of Tension Members:
Tension members are linear member in which axial forces act to cause elongation. Such member can sustain load upto the ultimate load, which stage they may fail by rupture at a critical section.
The factored design tension (T) in members shall satisfy:
T < Td
where, Td is Design strength of member.
#Td is classified under as for Bolted Connection:
1. Tdg
2. Tdn
3. Tdb
Consider Td value whichever is less.
1) Due To Yeild Strength (Tdg):
Cl 6.2 Page 32
Tdg = Ag.fy/rmo
where,
Ag=Gross Area of Cross Section
fy=Yeild Stress of Material
2) Due To Rupture of Critical Section (Tdn):
Cl 6.3 Page 32
Tdn = 0.9.An.fu/rml
where,
An=(b-n.dh)t For Chain Bolting
fu=Ultimate Stress of Material
Cl 6.3.3
If there is Single Angle Section then,
Tdn =(.9Anc.fu/rml) + (beta.Ago.fy/rmo)
where,
beta=1.4-0.076(w/t)(fy/fu)(bs/Lc) < (fu.rmo/fy.rml)
>0.7
w=outstanding width
t=Thickness of Leg
bs=shear lag width
Lc=Length of end connection
An=Net area of Total Cross-section, as told above
Anc=Net Area of Connection Leg
Ago=Gross Area of the Outstanding Leg
3) Due to Block Shear (Tdb):
Cl 6.4
Tdn1 = (Avg.fy/ rmo.root3) + (0.9.Atn.fu/rml)
Tdn2 = (0.9.Avn.fu/rml.root3) + (Atg.fy/rmo)
where,
Avg = Lv.t
Avn= (Lv-n.dh).t
Atg = Lt.t
Atn = (Lt-ndh).t
#Td for Welded Connection:
The Block Shear Strength Should be checked for welded end connection for member which can shear off as block.
For this Avg = Avn = Lv.t
and Atg = Atn = Lt.t
where,
Lv is Longitudinal Length
Lt is Transverse Length
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