Types of rigid-frame bridge Rigid-frame bridge

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1 types of rigid-frame bridge

1.1 single span
1.2 v-shaped
1.3 batter-post





types of rigid-frame bridge
single span




















single span rigid-frame bridges typically made of reinforced concrete , commonly used on parkways , other roadways. design efficient use of material cross section @ mid-span relatively narrow , amount of concrete needed @ abutments reduced. narrow section @ mid-span gives bridge profile slight arch shape making design particularly useful when large headroom required. profile makes bridge more architecturally pleasing beam bridge. rigid-frame design may efficient bridge type spans between 35 , 80 feet. if steel used, economic advantage extends spans of 120 feet.


v-shaped














a v-shaped rigid frame efficient way support longer bridge using 1 span isn t feasible. each v-shaped pier supports deck in 2 places while requiring 1 foundation. bending moments experienced in piers minimal, allowing significant reductions in foundation size. additionally, effective length of each span shortened compared spans of bridge vertical piers. however, system less commonly used in rigid frame bridges because piers need approximately centered under bridge. bridges span on roadways or waterways , construction of piers in cases can costly , challenging.


batter-post

diagram of batter-post rigid frame bridge






















batter-post rigid frame bridges defined supports run deck abutments @ angle. design supports deck in similar way v-shaped piers differs in how foundations must built. piers bear on or next abutments, eliminating need foundations directly beneath bridge. particularly advantageous when bridge crosses river , constructing foundation in water challenging. result, either abutments have made larger or additional foundations must placed next abutments.








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