QUESTION $3$: b$)$ If the bolted connection is replaced by welded connection as shown. Calculate the new

capacity of the tension member. $(10$ Marks$)$

$(70$ marks$)$

a$)$ A single plate tension member $)$ is made of $300$ W Steel $,$

$Fu=450$MPa $).$ The member is connected through three $20$ mm diameter bolts to a flat gusset

plate as shown.

Identify clearly all possible failure paths $($modes$).(20$ Marks$)$

Calculate the factored tensile resistance $(Tr)$ of the tension member based on the rupture

surface $1-1-1-1.(15$ Marks$)$

$($All dimensions are to the center of the holes$)$

c$)$ Determine the resistance capacity of the fillet welded joint for the following data:

Ultimate tensile strength of the electrode $(xu)=550$MPa, weld size $(D)=6mm.(10$ Marks$)$

d$)$ As a structural steel designer, do you recommend using the longitudinal welding as in parts b$)$

and c$)$ or replacing that by transverse welding of weld size $($D$)=10mm,$ as shown below. Support

your answer with design calculations. $(15$ Marks$)$