Timber design: A bolted connection between two glulam GL$30$c elements should be designed $($Figure $1).$ The

element is part of a truss structure $($service class $2)$ and subjected to pure tension. The number

and spacing of bolts $($connection layout$)$ should be determined. Assume that no washers are used.

Glulam element base:

Glulam element height:

Glulam density:

Steel plate thickness:

Bolt diameter:

Bolt tensile strength:

Design tensile force:

$b=90mm$

$h=270mm$

${}_k=390k\frac{g}{m^3}$

$t=8mm$

$d=16mm$

$f_u=360$MPa

$N_d=250kN($load duration class is medium$)$