Concrete Filled Steel Tubular Stub Columns

This paper describes a numerical program to analyze the behavior of the concrete filled steel tubular cft stub columns and predict various modes of lateral interactions between steel tube and filled in concrete under axial compression.

Concrete filled steel tubular stub columns.

All test samples cross sectional area is 75 75 mm sup 2 sup square and they are 500 mm long. 2 for bidirectional stirrups. 1 shows some typical profiles of cfdst columns. Both outer and inner tubes were circular hollow sections chs.

The main experimental parameters for stub columns were the diameter to thickness ratio and hollow section ratio while those for beam columns were. This paper introduces simplified design methods for calculating the load bearing capacity of axially loaded concrete filled carbon steel tubular cfst stub columns and concrete filled stainless steel tubular cfsst stub columns. Extensive investigations have been carried out to study the mechanical performance of circular square and rectangular cft columns 1 c w. Roeder overview of hybrid and composite systems for seismic design in the united states eng.

A series of tests on concrete filled double skin steel tubular cfdst stub columns 14 and beam columns 12 were carried out. 5 a shows the effect of wall thickness on the load strain responses where. Concrete filled double skin steel tubular cfdst columns are a new type of steel concrete composite column which have a better performance than reinforced concrete and steel columns due to the favorable composite action between steel and concrete in the composite section. Concrete filled steel tubular cfst columns with circular square and rectangular cross sections have been widely used in civil engineering applications owing to their good structural performance to satisfy aesthetic requirements studies have been conducted on cfst columns with new cross sections such as triangles hexagons ellipses d shapes and fan shapes by a few.

Refined finite element fe models are developed for capturing the fire performance of cfst and cfsst stub columns under iso 834 fire. Concrete filled steel tubular cfst columns are widely used in construction of high rise buildings and peers of bridges to increase the lateral stiffness of the buildings the axial load capacity ductility toughness and resistance of corrosion of the columns. The cft represents concrete filled steel tubular stub column. This paper presents an experimental study on the cyclic behavior of fifteen concrete filled steel tubular columns subjected to vertical cyclic loading.

The main variables in the test are the thickness of the steel tube 1 8 and 3 0 mm with the width to thickness ratios svg xmlns xlink http. And 3 for loop stirrups. In this paper the tube wall thickness on the mechanical performances of the concrete filled steel tubular stub columns with round ends is also discussed. Concrete filled steel tubular cft columns have been widely used as structural members.