TrussDesignSincethestrengthofabeamisdeterminedbyit’sdepth,thedeeperthebeamthestrongeritis.Asoliddeepbeamisheavyandexpensivesoonesolutionistobuilditoutofsticks.Wecallthisatruss.Sinceparallelogramsarenotstableunderaloadandtrianglesare,wefindthattriangularshapesarethebestfortrusses.Thedeckofthebridgemaybeontopofthetruss,belowthetrussorthroughthetruss.
Pros*highstrength *deckplacement*economical *longspans
Cons*maintenance$ *preciselyengineered