Concrete Filled Steel Columns

Concrete filled steel tubes cfts are composite members consisting of an steel tube infilled with concrete.

Concrete filled steel columns.

9 3 1 mechanical characteristic and mechanism. Working in our modern environmentally compliant facility we make high quality building products used throughout the northeast. Conversely the steel tube acts as longitudinal and lateral reinforcement for the concrete core helping it to resist tension bending moment and shear. There exist applications in japan and europe where cfts are also used as bridge piers.

Based on fundamental mechanics the concept is aimed at controlling the local buckling of the steel tube and. In current international practice cft columns are used in the primary lateral resistance systems of both braced and unbraced building structures. In addition concrete filled circular hollow section columns as shown in figure 2 3 c containing an additional open section used as primary steel can also be designed as a composite section. In a concrete filled steel tube cfst column the steel tube provides.

The interaction between steel tube and concrete core is the key design considerations for concrete filled steel tube columns. The article discussed some of the benefits of filling hss columns with concrete including increased strength and a potential. Base section 4 each. 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.

Upper sections and 1 each. 5 section stackable concrete pier footing ez tube is a patented precast concrete footing ez tube is a patented precast concrete footing system consisting of a base section 1 or more upper sections and a threaded rod anchor to secure it into a single solid pier type footing. By jason ericksen se technical consultant to the steel tube institute. Concrete filled tube cft columns consists of a steel tube filled with concrete.

Zhenhai guo in principles of reinforced concrete 2014. Composite concrete filled hss. Located in southeastern massachusetts we are manufacturers of lightweight concrete filled support columns. Ez tube 5 includes 1 each.

Design strength of concrete filled steel columns 167 2 2 ultimate member capacity to estimate the ultimate member capacity nuc a slenderness effect represented by a slenderness reduction factor c should be considered for a stub column defined by le do or le b 4 where le the effective length of a column and b the section width of a rectangular tube this. The concrete core adds stiffness and compressive strength to the tubular column and reduces the potential for inward local buckling.