CONCENTRIC LOADING TESTS OF CONCRETE FILLED SPIRAL STEEL TUBES AND STRESS-STRAIN RELATION OF CONCRETE CONFINED BY STEEL TUBES

Effect of the Concrete Strength on the Concrete-Steel Bond in Concrete Filled Steel Tubes

In this study, the concrete-steel bond strength of concrete filled cylindrical steel tubes has been experimentally investigated. 22 short, high strength and normal concrete filled circular steel tubes were tested. Push-out test was carried out as the common method to evaluate the bond carrying capacity. Four different concrete mixes were used in preparing the specimens. The steel tubes were w...

Numerical Analysis of Concrete-Filled Circular Steel Tubes

Behavior of FRP-Confined Concrete-Filled Steel Tube Columns

This paper presents the results of an experimental study into the behavior of concrete-filled steel tube columns confined by fiber-reinforced polymer (FRP). Eleven columns were tested to investigate the effects of the FRP layer number, the thickness of the steel tube and concrete strength on their load capacity and axial deformation capacity. The experimental results indicated that the FRP wrap...

Non-linear Analysis of Multi-hazard Performance of Cylindrical Concrete Filled Steel Tubes Bridge Piers

Advanced finite element techniques are used to investigate the multi-hazard (earthquake and blast) performance of Concrete-Filled Steel Tubes (CFSTs) and Concrete Filled Double Skinned Tubes (CFDSTs) for bridge engineering applications. Specimens of both sections are analyzed using the finite element package LS-DYNA under similar seismic and blast loading. First, behavior of CFSTs recorded in s...

Damage Assessment for Performance-Based Design of Rectangular Concrete-Filled Steel Tubes

This paper summarizes research in which the damage evolution of rectangular concrete-filled steel tube (RCFT) members, connections, and frames, was documented using results from experimental tests from around the world. Two types of damage indices were then defined and used for each type of RCFT component to quantify damage. Based on the quantified values of damage, each local damage level iden...