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Hamid Reza Ovesy - One of the best experts on this subject based on the ideXlab platform.

  • Post-buckling finite strip analysis of thick functionally graded plates
    Structural Engineering and Mechanics, 2014
    Co-Authors: Mohammad Hajikazemi, Hamid Reza Ovesy, H. Assaee, M.h. Sadr
    Abstract:

    In this paper, a novel semi-energy finite strip method (FSM) is developed based on the concept of first order shear deformation theory (FSDT) in order to attempt the post-buckling solution for thin and relatively thick functionally graded (FG) plates under uniform End-Shortening. In order to study the effects of through-the-thickness shear stresses on the post-buckling behavior of FG plates, two previously developed finite strip methods, i.e., semi-energy FSM based on the concept of classical laminated plate theory (CLPT) and a CLPT full-energy FSM, are also implemented. Moreover, the effects of aspect ratio on initial post-buckling stiffness of FG rectangular plates are studied. It has been shown that the variation of the ratio of initial post-buckling stiffness to pre-buckling stiffness (S * /S) with respect to aspects ratios is quite indepEndent of volume fractions of constituents in thin FG plates. It has also been seen that the universal curve representing the variation of (S * /S) with aspect ratio of a FG plate demonstrate a saw shape curve. Moreover, it is revealed that for the thin FG plates in contrast to relatively thick plates, the variations of non- dimensional load versus End-Shortening is indepEndent of ceramic-metal volume fraction index. This means that the post-buckling behavior of thin FG plates and the thin pure isotropic plates is similar. The results are discussed in detail and compared with those obtained from finite element method (FEM) of analysis. The study of the results may have a great influence in design of FG plates encountering post-buckling behavior.

  • Pressure loading, End- Shortening and through- thickness shearing effects on geometrically nonlinear response of composite laminated plates using higher order finite strip method
    Structural Engineering and Mechanics, 2013
    Co-Authors: Mohammad H. Sherafat, Seyyed Amir Mahdi Ghannadpour, Hamid Reza Ovesy
    Abstract:

    A semi-analytical finite strip method is developed for analyzing the post-buckling behavior of rectangular composite laminated plates of arbitrary lay-up subjected to progressive End-Shortening in their plane and to normal pressure loading. In this method, all the displacements are postulated by the appropriate harmonic shape functions in the longitudinal direction and polynomial interpolation functions in the transverse direction. Thin or thick plates are assumed and correspondingly the Classical Plate Theory (CPT) or Higher Order Plate Theory (HOPT) is applied. The in-plane transverse deflection is allowed at the loaded Ends of the plate, whilst the same deflection at the unloaded edges is either allowed to occur or completely restrained. Geometric non-linearity is introduced in the strain-displacement equations in the manner of the von-Karman assumptions. The formulations of the finite strip methods are based on the concept of the principle of the minimum potential energy. The Newton-Raphson method is used to solve the non-linear equilibrium equations. A number of applications involving isotropic plates, symmetric and unsymmetric cross-ply laminates are described to investigate the through-thickness shearing effects as well as the effect of pressure loading, End-Shortening and boundary conditions. The study of the results has revealed that the response of the composite laminated plates is particularly influenced by the application of the Higher Order Plate Theory (HOPT) and normal pressure loading. In the relatively thick plates, the HOPT results have more accuracy than CPT.

  • A semi-energy finite strip non-linear analysis of imperfect composite laminates subjected to End-Shortening
    Thin-Walled Structures, 2012
    Co-Authors: H. Assaee, Hamid Reza Ovesy, Mohammad Hajikazemi
    Abstract:

    Abstract The geometric non-linear analysis of imperfect composite laminates is presented based on the concept of the Semi-Energy finite strip method (FSM). The initial out-of-plane imperfection is assumed to be of the sinusoidal shape in the longitudinal direction, and of different shapes in the transverse direction. The validity and numerical efficiency of the developed semi-energy FSM is investigated by comparing the results with those obtained from a fairly conventional and well exploited finite strip technique, namely the Full-Energy FSM as well as the evaluated results from ANSYS.

  • A novel semi energy finite strip method for post-buckling analysis of relatively thick anti-symmetric laminated plates
    Advances in Engineering Software, 2012
    Co-Authors: Hamid Reza Ovesy, Mohammad Hajikazemi, H. Assaee
    Abstract:

    In the current paper, a novel semi-energy FSM is developed based on the concept of first order shear deformation theory (FSDT) in order to attempt the post-buckling solution for thin and relatively thick anti-symmetric angle-ply composite laminates subjected to uniform End-Shortening. The laminated plates are assumed to be simply supported at their boundaries. The results are discussed in detail and compared with those obtained from finite element method (FEM) of analysis. The study of the results has provided confidence in the validity and capability of the developed FSM in handling the post buckling problem of anti-symmetric angle-ply laminates.

  • Post-buckling of thick symmetric laminated plates under End-Shortening and normal pressure using semi-energy finite strip method
    Computers & Structures, 2011
    Co-Authors: Hamid Reza Ovesy, H. Assaee, Mohammad Hajikazemi
    Abstract:

    The application of the semi-energy CLPT-FSM for the non-linear analysis of symmetric laminates is extEnded to include the effects of normal pressure loading in addition to the End-Shortening. Moreover, a new semi-energy FSM is developed based on the concept of FSDT theory in order to attempt the large deflection solution for relatively thick laminates. It is noted that for a given level of accuracy, the developed semi-energy FSM requires a markedly lower number of degrees of freedom compared to those of FEM analysis. Hence, the semi-energy FSM is more computationally efficient than the conventional energy based schemes.

G Morada - One of the best experts on this subject based on the ideXlab platform.

  • Post-buckling behavior of composite laminated plates under End Shortening and pressure loading, using two versions of finite strip method
    Composite Structures, 2006
    Co-Authors: Hamid Reza Ovesy, Seyyed Amir Mahdi Ghannadpour, G Morada
    Abstract:

    Abstract Two different versions of finite strip method, namely spline and semi-analytical methods, are developed for analyzing the geometrically non-linear response of rectangular composite laminated plates of arbitrary lay-up to progressive End-Shortening in their plane and to pressure loading. The plates are assumed to be thin so that the analysis can be carried out based on the classical plate theory. The in-plane lateral deflection υ is allowed at the loaded Ends of the plate, whilst the lateral expansion of the unloaded edges is either free or completely prevented. Geometric non-linearity is introduced in the strain–displacement equations in the manner of the von Karman assumptions. The formulations of the finite strip methods are based on the concept of the principle of the minimum potential energy. A number of applications involving isotropic plates, symmetric and unsymmetric cross-ply laminates are described to investigate the effects of pressure loading. The comparison between the two sets of results obtained by different finite strip methods is very good. The study of the results revealed that the response of the laminates is significantly influenced by the application of the normal pressure loading. Particularly, the response of unsymmetric laminates is strongly affected by the sign of the normal pressure loading.

  • Geometric non-linear analysis of box sections under End Shortening, using three different versions of the finite-strip method
    Thin-Walled Structures, 2006
    Co-Authors: Hamid Reza Ovesy, J. Loughlan, S.a.m. Ghannadpour, G Morada
    Abstract:

    Three finite-strip methods, (FSM) namely the semi-energy, full-energy semi-analytical and the full-energy spline FSM, are developed for predicting the geometrically non-linear response of box sections with simply supported Ends when subjected to uniform End Shortening in their plane. The developed FSMs are then applied to analyze the post-local-buckling behavior of some representative box sections. Although, in general, a very good agreement is observed to exist among the results obtained by all the different methods, it is revealed that in the advanced stages of post-buckling, the semi-energy method predicts results which are slightly less accurate than those obtained by the full-energy methods. This is due to the fact that a slightly higher level of compressional stiffness is experienced in the case of the results obtained by the semi-energy approach as compared to those observed in the cases of the results obtained by the full-energy methods. It is however worth noting that the current semi-energy analysis is based on a single term approach. Thus, it is expected that the accuracy of the semi-energy approach will improve and correspondingly the number of degrees of freedom involved will increase if more than one term is utilized in its formulation.

  • geometric non linear analysis of composite laminated plates with initial imperfection under End Shortening using two versions of finite strip method
    Composite Structures, 2005
    Co-Authors: H R Ovesy, Seyyed Amir Mahdi Ghannadpour, G Morada
    Abstract:

    Description is given of both spline and semi-analytical finite strip method for predicting the post-buckling response of rectangular composite laminated plates with initial imperfections, when subjected to progressive End Shortening. The initial imperfections are all assumed to be of the sinusoidal shape in the longitudinal direction, and of different shapes in the transverse direction. The laminates are simply supported out of their plane at the loaded Ends as well as unloaded edges. The in-plane lateral expansion υ is allowed all around the plates. The plates are assumed to be thin so that the analysis can be carried out based on the classical plate theory. Geometric non-linearity is introduced in the strain–displacement equations in the manner of the von Karman assumptions. The formulations of the finite strip methods are based on the concept of the principle of the minimum potential energy. The Newton–Raphson method is used to solve the non-linear equilibrium equations. A number of applications involving plates with different shapes of initial imperfections are described to investigate the capability of both versions of finite strip method.

Mohammad Hajikazemi - One of the best experts on this subject based on the ideXlab platform.

  • Post-buckling finite strip analysis of thick functionally graded plates
    Structural Engineering and Mechanics, 2014
    Co-Authors: Mohammad Hajikazemi, Hamid Reza Ovesy, H. Assaee, M.h. Sadr
    Abstract:

    In this paper, a novel semi-energy finite strip method (FSM) is developed based on the concept of first order shear deformation theory (FSDT) in order to attempt the post-buckling solution for thin and relatively thick functionally graded (FG) plates under uniform End-Shortening. In order to study the effects of through-the-thickness shear stresses on the post-buckling behavior of FG plates, two previously developed finite strip methods, i.e., semi-energy FSM based on the concept of classical laminated plate theory (CLPT) and a CLPT full-energy FSM, are also implemented. Moreover, the effects of aspect ratio on initial post-buckling stiffness of FG rectangular plates are studied. It has been shown that the variation of the ratio of initial post-buckling stiffness to pre-buckling stiffness (S * /S) with respect to aspects ratios is quite indepEndent of volume fractions of constituents in thin FG plates. It has also been seen that the universal curve representing the variation of (S * /S) with aspect ratio of a FG plate demonstrate a saw shape curve. Moreover, it is revealed that for the thin FG plates in contrast to relatively thick plates, the variations of non- dimensional load versus End-Shortening is indepEndent of ceramic-metal volume fraction index. This means that the post-buckling behavior of thin FG plates and the thin pure isotropic plates is similar. The results are discussed in detail and compared with those obtained from finite element method (FEM) of analysis. The study of the results may have a great influence in design of FG plates encountering post-buckling behavior.

  • A semi-energy finite strip non-linear analysis of imperfect composite laminates subjected to End-Shortening
    Thin-Walled Structures, 2012
    Co-Authors: H. Assaee, Hamid Reza Ovesy, Mohammad Hajikazemi
    Abstract:

    Abstract The geometric non-linear analysis of imperfect composite laminates is presented based on the concept of the Semi-Energy finite strip method (FSM). The initial out-of-plane imperfection is assumed to be of the sinusoidal shape in the longitudinal direction, and of different shapes in the transverse direction. The validity and numerical efficiency of the developed semi-energy FSM is investigated by comparing the results with those obtained from a fairly conventional and well exploited finite strip technique, namely the Full-Energy FSM as well as the evaluated results from ANSYS.

  • A novel semi energy finite strip method for post-buckling analysis of relatively thick anti-symmetric laminated plates
    Advances in Engineering Software, 2012
    Co-Authors: Hamid Reza Ovesy, Mohammad Hajikazemi, H. Assaee
    Abstract:

    In the current paper, a novel semi-energy FSM is developed based on the concept of first order shear deformation theory (FSDT) in order to attempt the post-buckling solution for thin and relatively thick anti-symmetric angle-ply composite laminates subjected to uniform End-Shortening. The laminated plates are assumed to be simply supported at their boundaries. The results are discussed in detail and compared with those obtained from finite element method (FEM) of analysis. The study of the results has provided confidence in the validity and capability of the developed FSM in handling the post buckling problem of anti-symmetric angle-ply laminates.

  • Post-buckling of thick symmetric laminated plates under End-Shortening and normal pressure using semi-energy finite strip method
    Computers & Structures, 2011
    Co-Authors: Hamid Reza Ovesy, H. Assaee, Mohammad Hajikazemi
    Abstract:

    The application of the semi-energy CLPT-FSM for the non-linear analysis of symmetric laminates is extEnded to include the effects of normal pressure loading in addition to the End-Shortening. Moreover, a new semi-energy FSM is developed based on the concept of FSDT theory in order to attempt the large deflection solution for relatively thick laminates. It is noted that for a given level of accuracy, the developed semi-energy FSM requires a markedly lower number of degrees of freedom compared to those of FEM analysis. Hence, the semi-energy FSM is more computationally efficient than the conventional energy based schemes.

  • Large Deflection Behavior of Composite Laminated Plates under End-Shortening and Normal Pressure Loading Using a Semi-Energy Finite Strip Method
    Key Engineering Materials, 2011
    Co-Authors: Hamid Reza Ovesy, Mohammad Hajikazemi, Mohammad Homayoun Sadr-lahidjani, H. Assaee
    Abstract:

    In this paper, the application of previously the semi energy finite strip method (FSM) for the non-linear post-buckling analysis of rectangular anti-symmetric laminates is extEnded to include the effects of normal pressure loading in addition to the progressive End-Shortening. One of the main advantages of the semi-energy FSM is that it is based on the closed form solution of von Karman’s compatibility equation. The developed finite strip method is applied to analyze the large deflection behavior of anti-symmetric angle ply composite laminated plates with simply supported boundary conditions at its loaded Ends. To validate the results, they are compared with those obtained from finite element method (FEM) of analysis.

H. Assaee - One of the best experts on this subject based on the ideXlab platform.

  • Post-buckling finite strip analysis of thick functionally graded plates
    Structural Engineering and Mechanics, 2014
    Co-Authors: Mohammad Hajikazemi, Hamid Reza Ovesy, H. Assaee, M.h. Sadr
    Abstract:

    In this paper, a novel semi-energy finite strip method (FSM) is developed based on the concept of first order shear deformation theory (FSDT) in order to attempt the post-buckling solution for thin and relatively thick functionally graded (FG) plates under uniform End-Shortening. In order to study the effects of through-the-thickness shear stresses on the post-buckling behavior of FG plates, two previously developed finite strip methods, i.e., semi-energy FSM based on the concept of classical laminated plate theory (CLPT) and a CLPT full-energy FSM, are also implemented. Moreover, the effects of aspect ratio on initial post-buckling stiffness of FG rectangular plates are studied. It has been shown that the variation of the ratio of initial post-buckling stiffness to pre-buckling stiffness (S * /S) with respect to aspects ratios is quite indepEndent of volume fractions of constituents in thin FG plates. It has also been seen that the universal curve representing the variation of (S * /S) with aspect ratio of a FG plate demonstrate a saw shape curve. Moreover, it is revealed that for the thin FG plates in contrast to relatively thick plates, the variations of non- dimensional load versus End-Shortening is indepEndent of ceramic-metal volume fraction index. This means that the post-buckling behavior of thin FG plates and the thin pure isotropic plates is similar. The results are discussed in detail and compared with those obtained from finite element method (FEM) of analysis. The study of the results may have a great influence in design of FG plates encountering post-buckling behavior.

  • A semi-energy finite strip non-linear analysis of imperfect composite laminates subjected to End-Shortening
    Thin-Walled Structures, 2012
    Co-Authors: H. Assaee, Hamid Reza Ovesy, Mohammad Hajikazemi
    Abstract:

    Abstract The geometric non-linear analysis of imperfect composite laminates is presented based on the concept of the Semi-Energy finite strip method (FSM). The initial out-of-plane imperfection is assumed to be of the sinusoidal shape in the longitudinal direction, and of different shapes in the transverse direction. The validity and numerical efficiency of the developed semi-energy FSM is investigated by comparing the results with those obtained from a fairly conventional and well exploited finite strip technique, namely the Full-Energy FSM as well as the evaluated results from ANSYS.

  • A novel semi energy finite strip method for post-buckling analysis of relatively thick anti-symmetric laminated plates
    Advances in Engineering Software, 2012
    Co-Authors: Hamid Reza Ovesy, Mohammad Hajikazemi, H. Assaee
    Abstract:

    In the current paper, a novel semi-energy FSM is developed based on the concept of first order shear deformation theory (FSDT) in order to attempt the post-buckling solution for thin and relatively thick anti-symmetric angle-ply composite laminates subjected to uniform End-Shortening. The laminated plates are assumed to be simply supported at their boundaries. The results are discussed in detail and compared with those obtained from finite element method (FEM) of analysis. The study of the results has provided confidence in the validity and capability of the developed FSM in handling the post buckling problem of anti-symmetric angle-ply laminates.

  • Post-buckling of thick symmetric laminated plates under End-Shortening and normal pressure using semi-energy finite strip method
    Computers & Structures, 2011
    Co-Authors: Hamid Reza Ovesy, H. Assaee, Mohammad Hajikazemi
    Abstract:

    The application of the semi-energy CLPT-FSM for the non-linear analysis of symmetric laminates is extEnded to include the effects of normal pressure loading in addition to the End-Shortening. Moreover, a new semi-energy FSM is developed based on the concept of FSDT theory in order to attempt the large deflection solution for relatively thick laminates. It is noted that for a given level of accuracy, the developed semi-energy FSM requires a markedly lower number of degrees of freedom compared to those of FEM analysis. Hence, the semi-energy FSM is more computationally efficient than the conventional energy based schemes.

  • Large Deflection Behavior of Composite Laminated Plates under End-Shortening and Normal Pressure Loading Using a Semi-Energy Finite Strip Method
    Key Engineering Materials, 2011
    Co-Authors: Hamid Reza Ovesy, Mohammad Hajikazemi, Mohammad Homayoun Sadr-lahidjani, H. Assaee
    Abstract:

    In this paper, the application of previously the semi energy finite strip method (FSM) for the non-linear post-buckling analysis of rectangular anti-symmetric laminates is extEnded to include the effects of normal pressure loading in addition to the progressive End-Shortening. One of the main advantages of the semi-energy FSM is that it is based on the closed form solution of von Karman’s compatibility equation. The developed finite strip method is applied to analyze the large deflection behavior of anti-symmetric angle ply composite laminated plates with simply supported boundary conditions at its loaded Ends. To validate the results, they are compared with those obtained from finite element method (FEM) of analysis.

S.a.m. Ghannadpour - One of the best experts on this subject based on the ideXlab platform.

  • A semi-analytical investigation on geometric nonlinear and progressive damage behavior of relatively thick laminated plates under lateral pressure and End-Shortening
    Composite Structures, 2018
    Co-Authors: S.a.m. Ghannadpour, A. Kurkaani Barvaj, Francesco Tornabene
    Abstract:

    Abstract Because of applications of composites in aircraft structures such as skin panels in the wings subjected to lift forces, ultimate strength estimation of these structures is of great importance. In order to more realistically simulate these structures, relatively thick composite plates are analyzed under both End-Shortening and lateral pressure loadings using a new simplified and reliable approach. Ultimate strength, progressive damage and geometric nonlinear analyses of such laminates under these loading conditions have not been done yet. Therefore, in the present study, first order shear deformation plate theory is considered with the assumptions of large deflections to perform the geometrically nonlinear and progressive failure analysis of moderately thick composite plates. In order to simulate the lift loads, two different types of lateral pressure distribution have been assumed to be applied on the plates; uniform and sinusoidal lateral pressure loads. The initial failure loads are calculated by means of elastic stress analyses. In this investigation, Hashin failure criteria have been selected for predicting failures. To modify the material properties, two geometric models have been considered to estimate the degradation zone around the failure location; degrading the material in regions of the plies or degrading the entire plies. The load is then increased step by step and for each given load, the stresses are reevaluated to inspect for possible failure. This procedure is repeated for each load increment until the final failure occurs and then ultimate strength is determined. To verify the proposed formulation, obtained results are compared with those calculated by finite element analyses. Plates having a range of thicknesses and with different intensities of pressure load have been analyzed extensively.

  • Pseudo spectral method in nonlinear analysis of relatively thick imperfect laminated plates under End-Shortening strain
    Composite Structures, 2017
    Co-Authors: S.a.m. Ghannadpour, P. Kiani, J. N. Reddy
    Abstract:

    Abstract In this paper, a pseudo spectral approach based on LegEndre Basis Functions (LBF) is developed for geometrically nonlinear analysis of laminated composite plates with and without geometric imperfections. Both classical plate theory (CPT) and first-order shear deformation plate theory (FSDT) are investigated and the field variable shape functions are constructed using Point Interpolation Method (PIM). Boundary conditions are enforced easily and directly on each boundary nodes. Due to sharp fluctuations at the boundaries and the occurrence of Runge’s phenomenon in the case of the uniform points, in the present study the domain is discretized with LegEndre-Gauss-Lobatto nodes. The system of equations is introduced by discretizing the von-Karman’s equilibrium equations and also boundary conditions with finite LegEndre basis functions that are substituted into the displacement fields. The nonlinear system of equations is solved by using the Newton-Raphson technique, and since the number of equations is always more than the number of unknown parameters, the least squares technique is used. Some examples involving various boundary conditions and initial imperfections are solved to demonstrate the validity and capability of the proposed method.

  • Geometric non-linear analysis of channel sections under End Shortening, using different versions of the finite strip method
    Computers & Structures, 2006
    Co-Authors: Hamid Reza Ovesy, J. Loughlan, S.a.m. Ghannadpour
    Abstract:

    Two finite strip methods, namely the full-energy and the semi-energy FSM, are developed for predicting the geometrically non-linear response of channel sections with simply supported Ends when subjected to uniform End Shortening in their plane. The developed finite strip methods are then applied to analyze the post-local-buckling behaviour of some representative channel sections. The comparison of results revealed the fact that for the channel sections under study, the full-energy finite strip method is capable of predicting results with a greater degree of accuracy than that of the results obtained by the semi-energy finite strip method. This is due to the fact that a lower level of compressional stiffness is experienced in the case of the full-energy FSM results as compared to those observed in the case of semi-energy FSM. It is however worth noting that at the expense of slightly less accurate results, the current semi-energy analysis is benefiting from considerably less computer CPU time, due to the implementation of a fairly small number of degrees of freedom, as compared to the CPU time elapsed by the computer when the full-energy method is applied. It is noted that in the current semi-energy approach only one term is utilized, whereas several terms are implemented in the formulation of the full-energy method. Therefore, it is expected that the accuracy of the semi-energy approach will improve and correspondingly the required computer CPU time will increase if more than one term is utilized in its formulation.

  • Geometric non-linear analysis of box sections under End Shortening, using three different versions of the finite-strip method
    Thin-Walled Structures, 2006
    Co-Authors: Hamid Reza Ovesy, J. Loughlan, S.a.m. Ghannadpour, G Morada
    Abstract:

    Three finite-strip methods, (FSM) namely the semi-energy, full-energy semi-analytical and the full-energy spline FSM, are developed for predicting the geometrically non-linear response of box sections with simply supported Ends when subjected to uniform End Shortening in their plane. The developed FSMs are then applied to analyze the post-local-buckling behavior of some representative box sections. Although, in general, a very good agreement is observed to exist among the results obtained by all the different methods, it is revealed that in the advanced stages of post-buckling, the semi-energy method predicts results which are slightly less accurate than those obtained by the full-energy methods. This is due to the fact that a slightly higher level of compressional stiffness is experienced in the case of the results obtained by the semi-energy approach as compared to those observed in the cases of the results obtained by the full-energy methods. It is however worth noting that the current semi-energy analysis is based on a single term approach. Thus, it is expected that the accuracy of the semi-energy approach will improve and correspondingly the number of degrees of freedom involved will increase if more than one term is utilized in its formulation.

  • Geometric non-linear analysis of thin flat plates under End Shortening, using different versions of the finite strip method
    International Journal of Mechanical Sciences, 2005
    Co-Authors: Hamid Reza Ovesy, J. Loughlan, S.a.m. Ghannadpour
    Abstract:

    Two finite strip methods are developed for predicting the geometrically non-linear response of rectangular thin plates with simply supported Ends when subjected to uniform End Shortening in their plane. Although the formulations of both finite strip methods are based on the concept of the principle of minimum potential energy, the first finite strip method utilizes a semi-energy finite strip, whereas in the second finite strip method (which is designated by the name full-energy finite strip method) all the displacements are postulated by the appropriate shape functions. It is noted that in the semi-energy finite strip approach, the out-of-plane displacement of the finite strip is the only displacement which is postulated by a deflected form while the von Karman's compatibility equation is solved to obtain the corresponding in-plane displacement forms. The developed finite strip methods are then applied to analyze the post-local-buckling behavior of some representative thin flat plates for which the results are also obtained through the application of finite element method, employing general purpose MSC/NASTRAN package. Through the comparison of results and the appropriate discussion, the knowledge of the level of capability of different versions of finite strip method is significantly promoted.