In India a large number of long span bridges have been constructed and some of notable examples being barak bridge at silchar built in 1960 with a main span of 130m and lunha bridge in assam with a span of 130m between bearings.

Overall thickness = 500mm and thickness of wearing coarse = 80mm, x is 3.6m
Effective length of road = (3.6+2(0.5+0.08)) = 4.76m.

Prestressed concrete is ideally suited for office, industrial and commercial buildings when large column free open spaces are required and precast pretensioned cored slabs having circular or elliptical cavities have been widely used in Russia for floor panels of multistory buildings.

Folded plates prestressed with curved cables to cover 60m span roof of a town hall in west phalia, germany and in comparison with types of roofs, folded plate roof provides most economical solution with minimum maintenance costs.

b = 250mm, D = 200mm
Minimum reinforcement of 0.8% in section A_s = (0.8x200x250/100) = 400mm².

In case of structures located in coastal area where humidity and temperature are high, it is preferable to use concrete trusses in place of steel trusses which are vulnerable to rust and deterioration due to high humidity.

The width of various compression and tension members is kept constant at 200-350mm depending upon span of truss and depth of top bottom members which are in compression generally is range of 200-300mm.

The trusses are analyzed for dead, wind and snow loads applied to joints of top chord and load of suspend mechanical handling facilities is applied at panel points of bottom chord and se loads are analyzed against check for deflection for safety of structure.

Post tensioning is ideally suited for prestressing long span girders at site of construction, without need for costly factory type installations like pretensioning beds and segmental construction is ideally suited for post tensioning work and in this method, a number of segments can be combined by prestressing resulting in an integrated structure.

The polygonal built up from blocks with prestressed bottom chord having wire cable: for 18m ? concrete requirement per truss (m³) 24m-3.85m³, 30m-5.28m³ and difference in truss is observed for different diameters of wire cables.