Section Beams are made of steel and they have a specific lengths and shapes like -beam, 'L', C-channel and I flanged beam. These types of section are usually used in steel structures and it is common to connect them with plates of steel.
Joints There are three connection types:
Rivets Bolts Welding
Rivets are the strongest and most common type.AGS by Wiley structural systems : steel
Safety There are some calculation methods to determine whether the design and construction of the truss is safe.
References