The Experts below are selected from a list of 132 Experts worldwide ranked by ideXlab platform

Xing You Yao - One of the best experts on this subject based on the ideXlab platform.

  • Experiment and Design Method on Cold-Formed Thin-Walled Steel Lipped Channel Columns with Slotted Web Holes Under Axial Compression
    The Open Civil Engineering Journal, 2017
    Co-Authors: Xing You Yao
    Abstract:

    Background: Cold-formed steel structural sections used in the walls of residential buildings and agricultural facilities are commonly C-shaped sections with web holes. These holes located in the web of sections can alter the Elastic stiffness and the ultimate strength of a structural member. The objective of this paper is to study the Buckling mode and load-carrying capacity of cold-formed thin-walled steel column with slotted web holes. Methods: Compression tests were conducted on 26 intermediate length columns with and without holes. The tested compressive members included four different kinds of holes. For each specimen, a shell finite element Eigen-Buckling analysis and nonlinear analysis were also conducted. The influence of the slotted web hole on local and distortional Buckling response had also been studied. The comparison on ultimate strength between test results and calculated results using Chinese cold-formed steel specification GB50018-2002, North American cold-formed steel specification AISI S100-2016, and nonlinear Finite Element method was made. Result: Test results showed that the distortional Buckling occurred for intermediate columns with slotted holes and the ultimate strength of columns with holes was less than that of columns without holes. The ultimate strength of columns decreased with the increase in transverse width of hole in the cross-section of member. The Finite element analysis results showed that the web holes could influence on the Elastic Buckling Stress of columns. The shell finite element could be used to model the Buckling modes and analysis the ultimate strength of members with slotted web holes. The calculated ultimate strength shows that results predicted with AISI S100-2016 and analyzed using finite element method are close to test results. The calculated results using Chinese code are higher than the test results because Chinese code has no provision to calculate the ultimate strength of members with slotted web holes. Conclusion: The calculated method for cold-formed thin-walled steel columns with slotted web holes are proposed based on effective width method in Chinese code. The results calculated using the proposed method show good agreement with test results and can be used in engineering design for some specific cold-formed steel columns with slotted web holes studied in this paper.

  • Load-Carrying Capacity Estimation Methods for Cold-Formed Steel Lipped Channel Member Using Effective Width Method
    Advanced Materials Research, 2010
    Co-Authors: Xing You Yao, Zu Yan Shen
    Abstract:

    Distortional Buckling may occur for Cold-formed thin-walled steel lipped channel member except local Buckling and overall Buckling. The Buckling of flange and lip are the important factor for the occurrence the distortional Buckling. The different design codes have different design method for calculating plate Buckling coefficient of flange and lip using the effective width method. So the effective width method in different codes are introduced and the load-carrying capacities of 100 lipped channel section compressive members collected from reference are computed using ‘Cold-formed steel structures (AS/NZS 4600:2005)’, ‘Supplementary rules for cold-formed members and sheeting(EN1993-1-3:2006)’, ‘North American specification for the design of cold-formed steel Structural Members(AISI-S100:2007)’, ‘Specification for the design of cold-formed steel structural members (AISI:1996)’ and ‘Technical code of cold-formed thin-walled steel structures’(GB50018-2002). The calculated results show that ‘Technical code of cold-formed thin-walled steel structures (GB50018-2002)’ and ‘Supplementary rules for cold-formed members and sheeting (EN1993-1-3:2006)’ are conservative and ‘Cold-formed steel structures (AS/NZS 4600:2005)’, ‘North American specification for the design of cold-formed steel Structural Members (AISI-S100:2007)’ and ‘Specification for the design of cold-formed steel structural members (AISI:1996)’ are unsafe. The Elastic Buckling Stress of different lipped channel sections are predicted by finite strip program (CUFSM) and get the suggested calculation formula of plate Buckling coefficient of flange according to regression Analysis. The calculated results using suggested plate Buckling coefficient of flange are agree to test results.

Hyuk-chun Noh - One of the best experts on this subject based on the ideXlab platform.

  • Investigation into the Buckling coefficients of plates with holes con-sidering variation of hole size and plate thickness
    Mechanics, 2016
    Co-Authors: Behzad Mohammadzadeh, Hyuk-chun Noh
    Abstract:

    Plate one of the popular structural elements used in a wide range of industries and structures, often failed by Buckling due to subjected compressive Stresses and shear loads. In its application, sometimes making holes through plates is needed. the finite element parametric studies demonstrate that holes may create unique Buckling modes, and can decrease critical Elastic Buckling Stress depending on the size and location of holes. This study investigates Buckling of plates with through-thickness holes. The effects of size of hole as well as teh effects of thickness of the plate on critical load of plate having holes are analyzed and investigated by using finite element method(FEM) by using software ABAQUS. Then by using the Gerard and Becker equation compressive Buckling coefficients, Kc, are calculated and presented to enable designers to calculate Buckling load for the desired plate with holes in specific dimension.DOI: http://dx.doi.org/10.5755/j01.mech.22.3.12767

Kim J.r. Rasmussen - One of the best experts on this subject based on the ideXlab platform.

  • design of slender angle section beam columns by the direct strength method
    Journal of Structural Engineering-asce, 2006
    Co-Authors: Kim J.r. Rasmussen
    Abstract:

    This paper is concerned with the application of the direct strength method to equal angle section beam-columns with locally unstable legs. In contrast to existing design methods, which independently determine the compression and bending capacities and use an interaction equation to combine these, the direct strength method determines the Elastic local Buckling Stress for the actual Stress distribution resulting from the combined action of compression and bending, and incorporates the Elastic Buckling Stress into a direct strength equation for beam-columns. In applying the method to equal leg angles, the torsional Buckling mode is ignored when determining the overall Buckling capacities, since it is accounted for through the local Buckling mode, and the shift of the effective centroid is incorporated as an additional loading eccentricity. The shift in the effective centroid resulting from local Buckling is determined from the actual Stress distribution, as obtained using Stowell's classical solution, in place of an effective cross section. The predicted strengths are conservative compared to tests on slender equal angle columns, and are shown to accurately predict the variation in load with applied loading eccentricity.

Behzad Mohammadzadeh - One of the best experts on this subject based on the ideXlab platform.

  • Investigation into the Buckling coefficients of plates with holes con-sidering variation of hole size and plate thickness
    Mechanics, 2016
    Co-Authors: Behzad Mohammadzadeh, Hyuk-chun Noh
    Abstract:

    Plate one of the popular structural elements used in a wide range of industries and structures, often failed by Buckling due to subjected compressive Stresses and shear loads. In its application, sometimes making holes through plates is needed. the finite element parametric studies demonstrate that holes may create unique Buckling modes, and can decrease critical Elastic Buckling Stress depending on the size and location of holes. This study investigates Buckling of plates with through-thickness holes. The effects of size of hole as well as teh effects of thickness of the plate on critical load of plate having holes are analyzed and investigated by using finite element method(FEM) by using software ABAQUS. Then by using the Gerard and Becker equation compressive Buckling coefficients, Kc, are calculated and presented to enable designers to calculate Buckling load for the desired plate with holes in specific dimension.DOI: http://dx.doi.org/10.5755/j01.mech.22.3.12767

Mohamed Elchalakani - One of the best experts on this subject based on the ideXlab platform.

  • Theoretical analysis of foam-filled Aluminum tubes subjected to bending and denting
    Tubular Structures XIV, 2012
    Co-Authors: Mohamed Elchalakani, D Ruan
    Abstract:

    This paper presents a theoretical analysis for aluminum tubes filled with aluminum foam deforming in a kink collapse mode under large deformation bending and indentation. The local indentation of a tube by an indenter is a generic problem that arsis in many areas of structural mechanics and in safety considerations in applications such as vehicle safety and accident research. The classical beam on Elastic foundation model was modified to predict the critical Buckling Stress which was compared to the classical Elastic Stress for the empty tube to quantify the effect of the foam. A closed form solution was obtained for the critical Elastic Buckling Stress. During deep collapse of the tube, the fold formation process was such that the shell curvature flattened on the compression side transforming into two large flat triangles attached to each other. The collapse proceeded progressively by folding about the base and sides of these triangles. An expression for the plastic collapse load was obtained by equating the total energy absorbed in bending and flattening to the external work carried out by the indenter during deformation of the tube.A good agreement was found between the predicted load-deflection curves and those obtained from recent experiments carried out by the second author which were published elsewhere

  • axial capacity and design of thin walled steel shs strengthened with cfrp
    Thin-walled Structures, 2009
    Co-Authors: Michael Richard Bambach, Hussein Haji Jama, Mohamed Elchalakani
    Abstract:

    Abstract Carbon fibre reinforced polymer (CFRP) strengthening of structures has been gaining increasing interest, traditionally applied to concrete structures, and more recently applied to steel structures. This paper describes 20 experiments on short, axially compressed square hollow sections (SHS) cold-formed from G450 steel and strengthened with externally bonded CFRP. The SHS were fabricated by spot-welding and had plate width-to-thickness ratios between 42 and 120, resulting in plate slenderness ratios between 1.1 and 3.2. Two different matrix layouts of the CFRP were investigated. It is shown that the application of CFRP to slender sections delays local Buckling and subsequently results in significant increases in Elastic Buckling Stress, axial capacity and strength-to-weight ratio of the compression members. The experiments are an extension of a previous study [Bambach MR, Elchalakani M. Plastic mechanism analysis of steel SHS strengthened with CFRP under large axial deformation. Thin-Walled Structures 2007;45(2):159–70] in which 25 commercially produced SHS with plate slenderness values between 0.3 and 1.6 were strengthened with CFRP in the same manner. A design method is developed whereby the theoretical Elastic Buckling Stress of the composite steel–CFRP sections is used to determine the axial capacity, and is shown to compare well with the 45 test results. A reliability analysis shows the method to be suitable for design.