Concrete Filled Steel Columns

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.

Concrete filled steel columns.

9 3 1 mechanical characteristic and mechanism. In a concrete filled steel tube cfst column the steel tube provides. Conversely the steel tube acts as longitudinal and lateral reinforcement for the concrete core helping it to resist tension bending moment and shear. Upper sections and 1 each.

In current international practice cft columns are used in the primary lateral resistance systems of both braced and unbraced building structures. 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 core adds stiffness and compressive strength to the tubular column and reduces the potential for inward local buckling. The interaction between steel tube and concrete core is the key design considerations for concrete filled steel tube columns.

Kim olson and benjamin kaan authored an enews article titled practical guidance for concrete filled hss columns in september 2015. There exist applications in japan and europe where cfts are also used as bridge piers. This paper presents a study to introduce and experimentally validate an innovative concrete filled steel tubular cft column system named as confined cft or ccft for improved seismic design of steel and concrete composite structures. 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. Zhenhai guo in principles of reinforced concrete 2014. Concrete filled steel tubes cfts are composite members consisting of an steel tube infilled with concrete. Located in southeastern massachusetts we are manufacturers of lightweight concrete filled support columns.

Working in our modern environmentally compliant facility we make high quality building products used throughout the northeast. By jason ericksen se technical consultant to the steel tube institute. If you cannot find genuine lally column products in your area contact the manager of your local lumberyard including lowe s and home depot. Concrete filled tube cft columns consists of a steel tube filled with concrete.

The article discussed some of the benefits of filling hss columns with concrete including increased strength and a potential. 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.