scholarly journals Mechanism and Suppression of Excessive Decrease in Outside Diameter and Bending Phenomenon in Cold-Reduction of Steel Tube Diameter

2006 ◽  
Vol 47 (542) ◽  
pp. 210-215
Author(s):  
Tatsuya OKUI ◽  
Kouichi KURODA ◽  
Masayoshi AKIYAMA
Keyword(s):  
Steel Tube ◽  
Tube Diameter ◽  
Cold Reduction ◽  
Outside Diameter

Influence of Inner Steel Tube Diameter on Compressive Behavior of Square FRP-HSC-Steel Double-Skin Tubular Columns

2015 ◽  
Vol 1119 ◽  
pp. 688-693 ◽  
Author(s):  
Butje Alfonsius Louk Fanggi ◽  
Togay Ozbakkloglu
Keyword(s):  
Axial Compression ◽  
Axial Stress ◽  
Steel Tube ◽  
Tube Diameter ◽  
Experimental Program ◽  
Composite Columns ◽  
Tubular Columns ◽  
Column System ◽  
Double Skin ◽  
The University

FRP-concrete-steel double-skin tubular columns (DSTCs) are a new form composite column system that effectively combines the advantages of the constituent materials. The performance of this column system has been experimentally investigated in a number of recent studies. However, apart from a single study reported on square DSTCs, all of the existing studies have been concerned with DSTCs with circular external tubes. This paper reports on part of an ongoing experimental program at the University of Adelaide on FRP-concrete-steel composite columns. The results from 12 square hollow and concrete-filled DSTCs and six companion hollow concrete-filled FRP tubes (H-CFFTs) that were tested under axial compression are presented. Results of the experimental study indicate that hollow DSTCs with larger inner steel tube diameters develop similar ultimate axial stresses to but significantly larger axial strains than companion DSTCs with smaller inner steel tubes. The results also show that, in concrete-filled DSTCs with similar Ds/ts ratios, an increase in the steel tube diameter leads to an increase in both axial stress and strain of concrete. It was observed that H-CFFTs perform significantly worse than both hollow and filled DSTCs under axial compression, and their behavior further degrades with an increase in the diameter of their inner voids.

scholarly journals Axial Compression Performance and Residual Strength Calculation of Concrete-Encased CFST Composite Columns Exposure to High Temperature

2022 ◽  
Vol 12 (1) ◽  
pp. 480
Author(s):  
Xiaojun Ke ◽  
Wannian Xiang ◽  
Xiuning Peng ◽  
Yu Dan
Keyword(s):  
High Temperature ◽  
Bearing Capacity ◽  
High Temperatures ◽  
Heating Temperature ◽  
Steel Tube ◽  
Concrete Cover ◽  
Tube Diameter ◽  
Composite Columns ◽  
Load Displacement ◽  
Cover Thickness

Concrete-encased concrete-filled steel tube (CFST) composite columns provide high bearing capacity, good seismic performance and an easier connection with arbitrary angle beams, which are widely used in high-rise buildings. Considering the high frequency of building fires, experimental research investigated the axial compressive behavior of the composite columns’ exposure to high temperature in this paper. Fourteen specimens after exposure to high temperatures with different parameters, including the heating temperature, steel tube diameter and concrete cover thickness, were fabricated to test under axial compressive loading. The failure pattern, load-displacement curve, bearing capacity, initial stiffness, deformation performance and damage rule of the specimens were discussed. The test results showed obvious differences in damage of specimens subjected to various high temperatures. The failure of the specimens began with the spalling and crushing of the concrete at the edge and ends in a lantern shape. The load-displacement curves of the specimens were significantly affected by high temperature, while the influence the of steel tube diameter and concrete cover thickness was relatively weak. A method of calculating axially loaded capacity for the composite column exposure to high temperature is proposed considering the effects of the main parameters of heating temperature and steel tube position, and the calculated results are in good agreement with the experimental results.

A Study on Experimental on Bending-Shear Behavior of Concrete-Filled Double Skin Steel Tubular Beams

2020 ◽  
Vol 986 ◽  
pp. 71-77
Author(s):  
Lee Seung Jo
Keyword(s):  
Restraint Stress ◽  
Concrete Strength ◽  
Maximum Load ◽  
Steel Tube ◽  
Diameter Ratio ◽  
Structural Behavior ◽  
Displacement Ductility ◽  
Failure Type ◽  
Double Skin ◽  
Outside Diameter

This study examined the effects of the inside-outside diameter ratio (Di/D0), concrete strength, and inside-outside reinforcement type of steel tube on the structural behavior of concrete-filled double-skin steel tubular (CFDT) beams. Towards this end, the failure type, load-deflection relationship, ultimate strength, and displacement ductility were compared and analyzed. The results showed that the maximum load-deflection and failure type are affected by the Di/D0 and the reinforcement method. Furthermore, the higher the Di/D0 was, the lower the restraint stress and maximum load became.

Effect of Tube Diameter on Wall Shear Stress Measurements Using Preston Tubes

2000 ◽  
Author(s):  
Sutardi ◽  
C. Y. Ching
Keyword(s):  
Boundary Layer ◽  
Shear Stress ◽  
Wall Shear Stress ◽  
Reynolds Numbers ◽  
Tube Diameter ◽  
Momentum Thickness ◽  
Maximum Difference ◽  
Calibration Equation ◽  
Wall Shear ◽  
Outside Diameter

Abstract The effect of tube diameter (d) on wall shear stress (τw) measurements using Preston tubes has been investigated in a zero pressure gradient turbulent boundary layer. Five different outside diameter tubes of 1.46, 1.82, 3.23, 4.76 and 5.54 mm, corresponding to (d/δ) of 0.022, 0.027, 0.048, 0.071 and 0.082 were used to measure τw at Reynolds numbers based on momentum thickness (Rθ) of 2800 to 4100. The calibration curves of Patel (1965) and Bechert (1995) are both dependent on the tube diameter. The maximum difference in the τw measurements from the different tubes using Patel’s calibration is about 8%, while Bechert’s calibration gives a maximum difference of approximately 18%. Based on the present measurements, a new Preston tube calibration equation that is less sensitive to the tube diameter is proposed.

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