Geometric Nonlinearity of the Thin-Walled Profile under Transverse Bending

2014 ◽  
Vol 633-634 ◽  
pp. 1133-1139 ◽  
Author(s):  
Darya Trubina ◽  
Dzhamal Abdulaev ◽  
Egor Pichugin ◽  
Vladimir Rybokov
Keyword(s):  
Bearing Capacity ◽  
Geometric Nonlinearity ◽  
Local Buckling ◽  
Transverse Bending ◽  
Thin Walled

Local buckling and accounting of the geometric nonlinearity of light steel thin-walled profiles is an important topic. The authors assesses the influence of geometric nonlinearity on the bearing capacity profile in transverse bending conditions.

Comparison of the Bearing Capacity of LST- Profile Depending on the Thickness of its Elements

2015 ◽  
Vol 725-726 ◽  
pp. 752-757 ◽  
Author(s):  
Darya Trubina ◽  
Dzhamal Abdulaev ◽  
Egor Pichugin ◽  
Vladimir Rybakov ◽  
Marsel Garifullin ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Cross Section ◽  
Local Buckling ◽  
Transverse Bending ◽  
Thin Walled ◽  
The Cross

The influence of local buckling on the bearing capacity of light steel thin-walled profiles is a hot topic today. In this paper we evaluated the effect of the thickness of the elements of the cross section on bearing capacity the profile in a transverse bending.

scholarly journals Research on Compression Behavior of Square Thin-Walled CFST Columns with Steel-Bar Stiffeners

2018 ◽  
Vol 8 (9) ◽  
pp. 1602 ◽  
Author(s):  
Zhao Yang ◽  
Chengxiang Xu
Keyword(s):  
Bearing Capacity ◽  
Local Buckling ◽  
Steel Tube ◽  
Steel Tubes ◽  
Compression Behavior ◽  
Steel Bar ◽  
Steel Bars ◽  
Thin Walled ◽  
Structural Measure ◽  
Cfst Columns

Local buckling in steel tubes was observed to be capable of reducing the ultimate loads of thin-walled concrete-filled steel-tube (CFST) columns under axial compression. To strengthen the steel tubes, steel bars were proposed in this paper to be used as stiffeners fixed onto the tubes. Static-loading tests were conducted to study the compression behavior of square thin-walled CFST columns with steel bar stiffeners placed inside or outside the tube. The effect and feasibility of steel bar stiffeners were studied through the analysis of failure mode, load–displacement relationship, ultimate load, ductility, and local buckling. Different setting methods of steel bars were compared as well. The results showed that steel-bar stiffeners proposed in this paper can be effective in delaying local buckling as well as increasing the bearing capacity of the columns, but will decrease the ductility of the columns. In order to obtain a higher bearing capacity of columns, steel bars with low stiffness should be placed inside and steel bars with high stiffness should be placed outside of the steel tubes. The study is helpful in providing reference to the popularization and application of this new structural measure to avoid or delay the local buckling of thin-walled CFST columns.

scholarly journals Buckling Analysis and Section Optimum for Square Thin-Wall CFST Columns Sealed by Self-Tapping Screws

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
He Zhang ◽  
Kai Wu ◽  
Chao Xu ◽  
Lijian Ren ◽  
Feng Chen
Keyword(s):  
Bearing Capacity ◽  
Failure Modes ◽  
Steel Plate ◽  
Local Buckling ◽  
Steel Tube ◽  
Thin Wall ◽  
Type Section ◽  
Plate Buckling ◽  
Thin Walled ◽  
Cfst Columns

Two columns of thin-walled concrete-filled steel tubes (CFSTs), in which tube seams are connected by self-tapping screws, are axial compression tested and FEM simulated; the influence of local buckling on the column compression bearing capacity is discussed. Failure modes of square thin-wall CFST columns are, first, steel tube plate buckling and then the collapse of steel and concrete in some corner edge areas. Interaction between concrete and steel makes the column continue to withstand higher forces after buckling appears. A large deflection analysis for tube elastic buckling reflects that equivalent uniform stress of the steel plate in the buckling area can reach yield stress and that steel can supply enough designing stress. Aiming at failure modes of square thin-walled CFST columns, a B-type section is proposed as an improvement scheme. Comparing the analysis results, the B-type section can address both the problems of corner collapse and steel plate buckling. This new type section can better make full use of the stress of the concrete material and the steel material; this type section can also increase the compression bearing capacity of the column.

The Loss of Local Stability of Thin-Walled Steel Profiles

2014 ◽  
Vol 633-634 ◽  
pp. 1052-1057 ◽  
Author(s):  
Darya Trubina ◽  
Dzhamal Abdulaev ◽  
Egor Pichugin ◽  
Marsel Garifullin
Keyword(s):  
Bearing Capacity ◽  
Local Stability ◽  
Complex Shape ◽  
Local Buckling ◽  
Design Stage ◽  
Simple Method ◽  
General Stability ◽  
Thin Walled ◽  
Potential Loss

Most methods for calculating bearing capacity profiles section of complex shape local buckling (LPA) are ignored. The problem of LPA rod is reduced to the problem of overall sustainability. At the design stage constructions of thin-walled beams, it is important to have a simple method for estimating the bearing capacity and the potential loss of local and general stability of the structure.

Effect of Constructional Measures on the Total and Local Loss Stability of the Thin-Walled Profile under Transverse Bending

2014 ◽  
Vol 633-634 ◽  
pp. 982-990 ◽  
Author(s):  
Darya Trubina ◽  
Dzhamal Abdulaev ◽  
Egor Pichugin ◽  
Vladimir Rybakov
Keyword(s):  
Local Buckling ◽  
Local Loss ◽  
Thin Walled Structures ◽  
Transverse Bending ◽  
Thin Walled

Work is devoted to the actual topic - local buckling of light steel thin-walled sections. Method of calculating stability in thin-walled structures described in the work. The mechanisms of local buckling under transverse bending considered by authors.

scholarly journals Design and bearing capacity analysis of cold-formed thin-walled steel-timber composite members

2021 ◽  
Vol 248 ◽  
pp. 03047
Author(s):  
Futing Pan ◽  
Ying Wang ◽  
Chunxiao Huang
Keyword(s):  
Bearing Capacity ◽  
Steel Plate ◽  
Local Buckling ◽  
Steel Structure ◽  
Thickness Ratio ◽  
Capacity Analysis ◽  
Light Weight ◽  
High Rise ◽  
Thin Walled ◽  
Large Width

Cold-formed thin-walled steel has light weight, large width thickness ratio, good economy and seismic performance. It is easy to realize standardization of design, and is very suitable for the development of prefabricated buildings. Due to the large width thickness ratio of cold-formed thin-walled steel , the steel plate is prone to local buckling when it is compressed, which will reduce the ductility and bearing capacity of the structure, which also leads to the limitation of the use of cold-formed thin-walled steel structure system in medium and high-rise buildings. In this paper, a kind of cold-formed thin-walled steel-timber composite members is designed. The section steel and the board are closely linked by bolts to work together. The thickness of the board and the spacing of the bolts are designed respectively, so as to provide reference for engineering design.

scholarly journals Experimental Study on Axial Compressive Behavior of Gangue Aggregate Concrete Filled FRP and Thin-Walled Steel Double Tubular Columns

Coatings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1404
Author(s):  
Jian Wang ◽  
Junwu Xia ◽  
Hongfei Chang ◽  
Youmin Han ◽  
Linli Yu ◽  
...  
Keyword(s):  
Stress State ◽  
Bearing Capacity ◽  
Axial Stress ◽  
Local Buckling ◽  
Steel Tube ◽  
Outer Diameter ◽  
Aggregate Concrete ◽  
Tubular Columns ◽  
Inner Diameter ◽  
Thin Walled

In the present paper, the monotonic axial compression test of gangue aggregate concrete filled Fiber reinforced polymer (FRP) and thin-walled steel double tubular columns (DTCC) was carried out, and the gangue aggregate concrete filled FRP tubular columns (CFFT) were designed as a comparison. The main experimental factors were the confinement level of the FRP jacket, the relative diameter ratio (the ratio of the outer diameter of the steel tube to the inner diameter of the FRP jacket), and the different strengths of gangue aggregate concrete. The test results show that the bearing capacity and ductility of gangue aggregate concrete in CFFT were significantly improved. As the local buckling of thin-walled steel tube was effectively inhibited, the load bearing capacity of DTCC was further improved compared with CFFT, but the change of dilation behavior and ductility was insignificant. By analyzing the bi-directional stress state of the steel tube, the confinement level of the external FRP jacket was the most sensitive factor affecting the hoop stress of the steel tube, and the axial stress was obviously weakened under the bi-directional stress state. In addition, with the increase of steel tube diameter, the confinement effect of steel tube in DTCC became more obvious.

ELASTIC BUCKLING OF THIN-WALLED CIRCULAR TUBES CONTAINING AN ELASTIC INFILL

2006 ◽  
Vol 06 (04) ◽  
pp. 457-474 ◽  
Author(s):  
M. A. BRADFORD ◽  
A. ROUFEGARINEJAD ◽  
Z. VRCELJ
Keyword(s):  
Axial Compression ◽  
A Priori ◽  
Local Buckling ◽  
Steel Tube ◽  
Transcendental Equation ◽  
Buckling Mode ◽  
Buckling Stress ◽  
Elastic Tubes ◽  
Thin Walled ◽  
Energy Formulation

Circular thin-walled elastic tubes under concentric axial loading usually fail by shell buckling, and in practical design procedures the buckling load can be determined by modifying the local buckling stress to account empirically for the imperfection sensitive response that is typical in Donnell shell theory. While the local buckling stress of a hollow thin-walled tube under concentric axial compression has a solution in closed form, that of a thin-walled circular tube with an elastic infill, which restrains the local buckling mode, has received far less attention. This paper addresses the local buckling of a tubular member subjected to axial compression, and formulates an energy-based technique for determining the local buckling stress as a function of the stiffness of the elastic infill by recourse to a transcendental equation. This simple energy formulation, with one degree of buckling freedom, shows that the elastic local buckling stress increases from 1 to [Formula: see text] times that of a hollow tube as the stiffness of the elastic infill increases from zero to infinity; the latter case being typical of that of a concrete-filled steel tube. The energy formulation is then recast into a multi-degree of freedom matrix stiffness format, in which the function for the buckling mode is a Fourier representation satisfying, a priori, the necessary kinematic condition that the buckling deformation vanishes at the point where it enters the elastic medium. The solution is shown to converge rapidly, and demonstrates that the simple transcendental formulation provides a sufficiently accurate representation of the buckling problem.

Experimental Investigation of Stiffened Square CFST Columns under Axial Load

2014 ◽  
Vol 919-921 ◽  
pp. 1794-1800
Author(s):  
Xin Zhi Zheng ◽  
Xin Hua Zheng
Keyword(s):  
Experimental Investigation ◽  
Bearing Capacity ◽  
Cross Sections ◽  
Axial Load ◽  
Local Buckling ◽  
Test Results ◽  
Tubular Columns ◽  
Economical Benefit ◽  
Steel Consumption ◽  
Cfst Columns

Abstract: 7 square steel tubular columns were tested to discuss the ultimate axial bearing capacity, ductility performance and the steel consumption under stiffened by steel belts and binding bars of different cross-sections. Test results indicate that only by increasing fewer amounts of steel usage, stiffened square CFST columns with binding bars can not only improve the overall effects of restraint and alleviate regional local buckling between the binding bars, but also improve the bearing capacity of concrete filled square steel tubular columns. The utility benefits and the economical benefit is considerable, deserving extensive use.

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