Skip to main content

DDSS - Tension Members

Design of Tension Members:

Design and Drawing of Steel Structures
For this we need IS 800 - 2007
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

Comments

Popular Post

Timber Buildings !?

Timber Buildings !?  Why do we need a timber building? Yes, timber buildings. As on earth human population is on an exponential rise, many and many people are trying to get home in a city where they have easy excess for the workplace for their own living. In the near future, as the population gets more concentrated in cities more and more structures I mean Tall Structures need to be built. Loading Bearing and Comparison So now architects and builders have opted for old Technic of using timber as a building material eliminating concrete and steel. Yes, it is very hard to find this amount of trees but not impossible. It can be grown and regrown as needed. Many projects have been in progress of this idea and it reduces about 75% of carbon emission as compared to concrete and steel structure.



Using timber coming directly from the forest doesn't have the appropriate strength required for a high rise building. So designers came up with the new idea of CLT i.e. Cross Laminate Timber which …