Concrete Filled Steel Tubes Pdf

Zhenhai guo in principles of reinforced concrete 2014.

Concrete filled steel tubes pdf.

In the past a large number of studies have been carried out on traditional straight cfst columns and some design codes have been developed worldwide 1 4. The design of such compression members is well covered by aisc 360 chapter i2 2 aisc 2010. On the other hand when steel tubes filled with concrete the steel buckling resistance increases and heavy stiffeners are not required which makes composite beams economical and alternative for concrete bridges applications 1 2 3. A concrete filled steel tube cft column system has many advantages compared with ordinary steel or reinforced concrete system.

One of the main advantages is the interaction between steel tube. If the spiral bar in a concrete column is very closely spaced and it is combined with the longitudinal reinforcement and the cover concrete is cancelled the steel tube confined concrete or the concrete filled steel tube is then formed. The concrete filled steel tube cft column system has many advantages compared with the ordinary steel or the reinforced concrete system. Table 4 d is the same as table 4 a except it provides the available strength for filled square hss with fy 50 ksi and fu 62 ksi astm a500 grade c and 5 ksi normal weight concrete.

1 american institute of steel construction v15 1 companion vol. Concrete fill adds stiffness and restrains buckling of tube more strength and stiffness from less material significantly reduced labor requirements better environmental protection concrete placement separated from environmentally sensitive areas longer construction season cft piers and piles can be used in. While the axial and flexural properties of cfts have been well researched research on their shear resistance is lacking. 127 149 2015 127 flexural performance of circular concrete filled cfrp steel tubes.

Concrete filled steel tubes cfsts and reinforced concrete filled steel tubes rcfsts are increasingly used in transportation structures as piers piles caissons or other foundation components. Steel tube institute article. 9 3 1 mechanical characteristic and mechanism.