RECTANGULAR CONCRETE FILLED STEEL TUBE SECTION(d/b = 0.5, E250 GRADE STEEL (fy = 250MPa) & M25 GRADE CONCRETE)

Steel Ratio =

As p y pck bc d c

py =

fy 1 .1

& pck =

f ck 1 .5

Depth of concrete sec tion d c = d 2t Width of concrete sec tion bc = b 2t

Chart No:1 Compression with M Minor or Axis Bending for Depth to Width Ratio of 0.5 1

SQUARE CONCRETE FILLED STEEL TUBE SECTION(d/b = 1.0, E250 GRADE STEEL (fy = 250MPa) & M25 GRADE CONCRETE)

Steel Ratio =

As p y pck bc d c

py =

fy 1 .1

& pck =

f ck 1 .5

Depth of concrete sec tion d c = d 2t Width of concrete sec tion bc = b 2t

Chart No: 2 Compression with Uniaxial Bending for Depth to Width Ratio of 1

2

RECTANGULAR CONCRETE FILLED STEEL TUBE SECTION(d/b = 2, E250 GRADE STEEL (fy = 250MPa) & M25 GRADE CONCRETE)

Steel Ratio =

As p y pck bc d c

py =

fy 1 .1

& pck =

f ck 1 .5

Depth of concrete sec tion d c = d 2t Width of concrete sec tion bc = b 2t

Chart No: 3 Compression with Major Axis Bending for Depth to Width Ratio of 2 3