Important Questions and Answers - Civil - Prestressed Concrete Bridges

PRE-STRESSED CONCRETE BRIDGES

1.  what is main advantage of prestressed concrete bridge deck.

•  High-strength concrete and high-tensile steel,    besides    being economical, make for slender sections, which are aesthetically superior.

·        Prestressed concrete bridges can be designed as class I type structures without any tensile stresses under service loads, thus resulting in a crack-free structure.

·        In comparison with steel bridges, prestressed concrete bridges require very littlemaintenance.

·        Prestressed concrete is ideally suited for composite bridge construction in which precast prestressed girders support the cast in situ slab deck. This type of con• struction is very popular since it involves minimum disruption of traffic.

2.Typical types Of Pre-Tensioned Prestressed Concrete Bridges .

a.     Voided slab

b.     Single tee

c.      Box beams

d.     Double tee

e.      Aasho-type girders with slab(U.S.A)

f.       Y-tube standard beams with slab

3.what is main advantage of prestressed concrete bridge deck.

·        Segmental construction is ideally suited for post -tensioning work.

·        Post-tensioning facilities the use of curved slabs hich improve the shear resistance of girders.

4.Typical types Of Post-Tensioned Prestressed Concrete Bridges .

a.     Solid slab (10-15m)

b.     Hollow slab(15-25m)

c.      Tee  beams(20-40m)

d.     Box girders, two cell(30-70m)

e.      Box girders ,trapezoidal (30-80m)