NUMERICAL EVALUATION OF CONCRETE FILLED STAINLESS STEEL TUBE FOR SHORT COLUMNS SUBJECTED TO AXIAL COMPRESSION LOAD

2018 ◽  
Vol 80 (2) ◽  
Author(s):  
Azrul Abd Mutalib ◽  
Mohamed Hamza Mussa ◽  
Khaleel Mohammad Khaleel Abusal
Keyword(s):  
Stainless Steel ◽  
Ultimate Strength ◽  
Ultimate Load ◽  
Load Capacity ◽  
Concrete Strength ◽  
Steel Tube ◽  
Stainless Steel Tube ◽  
Steel Tubes ◽  
Ultimate Load Capacity ◽  
Short Columns

Recently, the concrete filled stainless steel tubes (CFSST) columns are widely applied in modern construction due to its aesthetic appearance, high corrosion resistant and less construction cost. The current study aims to evaluate the behavior of CFSST column with square hollow section (SHS) numerically under axial compressive load by using ABAQUS software. A good consistency had achieved between the numerical and experimental test results in terms of load-displacement behaviour and ultimate strength with a maximum difference equal to 2%. Intensive parametric studies had been conducted to determine the effects of stainless steel tubes and concrete properties on the ultimate load capacity of CFSST column. The results proved that the stainless steel tube thickness (t) capable to increase the strength of column by143.59% at t = 10 mm as compared with t = 2 mm, whereas a slight effect had observed for the variation of stainless steel proof stress ( ). On the other hand, the higher values of concrete strength (fc′) obviously reduced the lateral expansion of CFSST column at initial load and led to increase the ultimate load capacity by 34.18 % at fc′ = 80 MPa as compared with  fc′ = 30 MPa. Furthermore, the design strengths calculated according to the Eurocode 4 for concrete filled steel tube (CFST) column appeared a good agreement with the numerical results within an average difference value 2.49%, hence, it could consider as the most rational design method to determine the ultimate strength of CFSST column.

Research on the Load Capacity of Separation Concrete-Filled Steel Tubes Subjected to Eccentric Compression on Separation Side

2010 ◽  
Vol 168-170 ◽  
pp. 632-636 ◽  
Author(s):  
Xia Ping Liu ◽  
Shu Tang ◽  
Chun Hui Tang ◽  
Zuo Yong Yang ◽  
Zuo Sun
Keyword(s):  
Ultimate Load ◽  
Load Capacity ◽  
Eccentricity Ratio ◽  
Steel Tubes ◽  
Ultimate Load Capacity ◽  
Short Columns ◽  
Separation Ratio ◽  
Eccentric Compression ◽  
Experimental Parameters ◽  
Concrete Filled Steel Tubes

This paper deals with the ultimate load capacity test on 14 short columns of separation concrete-filled steel tubes (CFST) which are subjected to the eccentric compression on separate side. The experimental parameters include the separation ratio and the eccentricity ratio. The result shows that the separation ratio and the eccentricity ratio will influence the load capacity of the components of the concrete-filled steel tubes which are subjected to the eccentric compression. The confinement of steel tubes to core concrete will be continuously weakened and the ultimate load capacity of the components will be decreased obviously with both the separation ratio and the eccentricity ratio increasing gradually.

Axisymmetric simulation of circular concrete-filled double-skin steel tubular short columns incorporating outer stainless-steel tube

2021 ◽  
Vol 227 ◽  
pp. 111416
Author(s):  
Tuan Trung Le ◽  
Vipulkumar Ishvarbhai Patel ◽  
Qing Quan Liang ◽  
Phat Huynh
Keyword(s):  
Stainless Steel ◽  
Steel Tube ◽  
Stainless Steel Tube ◽  
Short Columns ◽  
Double Skin

Analysis on Bearing Capacity of Solid Multibarrel Tube-Confined Concrete Short Columns (CHS Inner and SHS Outer) under Axial Compressive Load

2011 ◽  
Vol 255-260 ◽  
pp. 151-156 ◽  
Author(s):  
Zhao Qiang Zhang ◽  
Yong Yao
Keyword(s):  
Ultimate Load ◽  
Concrete Strength ◽  
Compressive Load ◽  
Steel Tube ◽  
Confined Concrete ◽  
Unified Strength Theory ◽  
Short Columns ◽  
Circular Steel Tube ◽  
Reduction Coefficient ◽  
Square Steel Tube

By introducing the reduction coefficient of concrete strength and the equivalent restriction reduction coefficient,the non-uniform confinement force of square steel tube to its core concrete is turned to that of equivalent circular steel tube. Then the ultimate load calculation formula for the solid multibarrel tube-confined concrete short columns (CHS inner and SHS outer) is derived based on the Unified Strength Theory(UST),in which the double restriction effect and the decrease of longitudinal stress because of the hoop tensile tension are considered. The influence of intermediate principal stress on the ultimate load is studied and the failure mechanism is discussed. The applicability of the formulas is testified and the results show that the formulas have significance in exerting material potential.

scholarly journals Effect of filling steel tube chords by concrete on the structural behaviour of composite truss girders

2020 ◽  
Vol 13 (3) ◽  
pp. 167-174
Author(s):  
Kareem Mohamed Alnebhan ◽  
Muhaned A. Shallal
Keyword(s):  
Failure Modes ◽  
Ultimate Load ◽  
Concrete Slab ◽  
Load Capacity ◽  
Steel Tube ◽  
Structural Behaviour ◽  
Steel Tubes ◽  
Surface Plasticity ◽  
Concrete Deck ◽  
Monotonic Load

In this study, three specimens of Warren truss girders composite with concrete deck slab were tested experimentally under a central monotonic load to study the effect of the existence of concrete inside the chords. The load capacity, deflection, slip between the concrete slab and steel tube, and failure modes were reported. Both chords were filled with concrete to the first specimen, only the lower chord was filled with concrete and the upper chord remained hollow to the second specimen and both chords were kept hollow in the third specimen. The result indicated that the existence of concrete inside the chords has a significant effect on the load capacity, failure pattern, and the slip. The steel tubes of the upper chord filled by concrete prevent surface plasticity failure of the upper chord under loading and increase the ultimate load by 6.68 %. Also, filling the lower chord with concrete prevents the surface plasticity failure in the supports zone and caused an increase in the ultimate load by 39.59 %. The slip at the end of the specimen of two chords filled with concrete is less by 71% than the end slip of specimen of hollow top chord and higher by 46.8 % than the specimen of two hollow chords.

Research on Mechanical Properties of Separation Concrete-Filled Steel Tubes Subjected to Eccentric Compression on Non-Separation Side

2011 ◽  
Vol 117-119 ◽  
pp. 887-892 ◽  
Author(s):  
Xia Ping Liu ◽  
Zhuo Sun ◽  
Hai Yun Huang ◽  
Shu Tang ◽  
Chun Hui Tang
Keyword(s):  
Mechanical Properties ◽  
Load Capacity ◽  
Eccentricity Ratio ◽  
Steel Tubes ◽  
Ultimate Load Capacity ◽  
Whole Process ◽  
Short Columns ◽  
Separation Ratio ◽  
Eccentric Compression ◽  
Concrete Filled Steel Tubes

This document deals with the whole process compression model test on 12 short columns of separation concrete-filled steel tubes (CFST) which are subjected to eccentric compression on the non-separation side. The experimental parameters include the separation ratio and the eccentricity ratio. The results show that the separation ratio and the eccentricity ratio will influence CFST components’ mechanical properties which contain the relationship of load-strain amd load-deformation, that especially embodied in the nonlinear stage. When compressed on non-separation side, the confinement of steel tubes to core concrete will be continuously weakened and the ultimate load capacity of the components will be decreased obviously with both the separation ratio and the eccentricity ratio increasing gradually. But it less serious which compare with that compressed on separation side.

Scent Identifications By Dogs (Canis Familiaris): a New Experimental Design

Behaviour ◽  
1997 ◽  
Vol 134 (7-8) ◽  
pp. 531-550 ◽  
Author(s):  
G.A.A. Schoon
Keyword(s):  
Stainless Steel ◽  
Working Conditions ◽  
Canis Familiaris ◽  
Steel Tube ◽  
Stainless Steel Tube ◽  
Experimental Setup ◽  
Sample Design ◽  
Steel Tubes ◽  
Match To Sample ◽  
In The Beginning

AbstractTraditionally, match-to-sample designs are used for forensic scent identifications: the scent of a perpetrator on a corpus delicti is matched to the scent of a suspect. In a number of cases, e.g. when the suspect is innocent, no match is possible, which leads to specific difficulties. In a new design an odd-even paradigm was followed, and care was taken to meet forensic prerequisites in the experimental setup. Four dogs were trained to compare a human scent (odour 1) on stainless steel tubes, training objects, or typical forensic objects to a human scent on a stainless steel tube (odour 2). Comparisons could be either 'odd' (1 ≠ 2) or 'even' (1 = 2). If the dogs performed poorly in the beginning of an experimental series, they were disqualified from making forensically interesting comparisons. Realistic experiments demonstrated the ability of dogs to compare scents following this protocol, but also showed that the results were influenced by the type of odour 1 and by the type of comparison. The performance of the dogs is compared to the performance of operational dogs in a match-to-sample design: the level of matching 'even' scents is comparable, but the level of non-matching in 'odd' comparisons is substantially higher in the new design. Scent identifications following an odd-even paradigm seem to be more reliable than the customary design. Introducing this new design would however require significant changes in attitude and working conditions of the police.

scholarly journals Mechanical properties of circular nano-silica concrete filled stainless steel tube stub columns after being exposed to freezing and thawing

2019 ◽  
Vol 8 (1) ◽  
pp. 600-618 ◽  
Author(s):  
Qingjie Lin ◽  
Yu Chen ◽  
Chao Liu
Keyword(s):  
Stainless Steel ◽  
Bearing Capacity ◽  
Failure Mode ◽  
Steel Tube ◽  
Stainless Steel Tube ◽  
Nano Silica ◽  
Freezing And Thawing ◽  
Freeze Thaw ◽  
Short Columns ◽  
Stub Columns

AbstractExperimental research on circular nano-silica concrete filled stainless steel tube (C-CFSST) stub columns after being exposed to freezing and thawing is carried out in this paper. All of forty specimens were tested in this paper, including nine C-CFSST specimens at normal temperature, 28 short columns of C-CFSST for freeze-thaw treatment and three circular hollow stainless steel stub columns. The failure mode, load-displacement curves, load-strain curves and load-bearing capacity were obtained and analyzed in this paper. The main parameters explored in the test include the number of freeze-thaw cycles (N=0, N=50, N=75, and N=100), wall thickness (T=1.0mm, T=1.2mm, T=1.5mm) andnano-silica concrete strength (fc=20MPa, fc=30MPa, fc=40MPa). The result shows that C-CFSST short columns at normal temperature and subjected to freezing and thawing follow similar failure mode. The effect of freeze-thaw cycles (N) of 50 on bearing capacity of C-CFSST column was maximal, and then the influence of N on the bearing capacity of specimens was small when N reached to 75, finally the effect of N on bearing capacity of C-CFSST column was large when N reached to 100. The bearing capacity of C-CFSST columns increases with increasing wall thickness. In addition, the loss percentage of bearing capacity of specimens (fc=40MPa) for freeze-thaw treatment is maximal, and the loss percentage of bearing capacity of specimens (fc=30MPa) for freeze-thaw treatment is minimal. According to the test results, this paper proposed a formula to calculate the bearing capacity of C-CFSST short columns for freeze-thaw treatment.

scholarly journals Influence of Red Mud Proportion on Circular Concrete-Filled Steel Tubular Short Columns

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Wu Bin ◽  
Tan Zhuoying ◽  
Li Fan ◽  
Wang Sun
Keyword(s):  
Red Mud ◽  
Longitudinal Strain ◽  
Ultimate Load ◽  
Steel Tube ◽  
Steel Tubes ◽  
Concrete Filled Steel Tube ◽  
Short Columns ◽  
Calculation Results ◽  
Concrete Filled Steel Tubes ◽  
Stub Columns

Tests on twelve circular concrete-filled steel tube stub columns with mixed red mud and three circular concrete-filled steel tube stub columns to investigate the influence of the mixed proportion of red mud on the mechanical behavior of axial compressive circular concrete-filled steel tube stub columns are reported. It is found that with the increase of red mud content, the ultimate load increases first and then decreases; on the contrary, the ultimate displacement decreases first and then increases; the specimen stress reaches the proportion limitation as the steel tube longitudinal strain is around 160 με and reaches the yield limitation as the steel tubes’ longitudinal strain is around 4400∼5000 με. The axial compressive bearing capacity empirical formulation of concrete-filled steel tubes stub columns mixed with red mud is proposed. The theoretical calculation results agree well with those experimental data.

Sign in / Sign up

Export Citation Format

Share Document