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Showing 1 to 20 of 55 for “"stiffener"”.
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Stiffener Design for Beam-to-Column Connections
Stiffeners are used as a means of providing additional support to columns at beam connection locations. They are added when the strength of the column is exceeded but full moment strength of the beam section is desired. In determining the design of column stiffeners, there are no specifications for …
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Optimization of stiffener placement for thin plate buckling
… large, triangular, diamond and truss type stiffener arrangements. The truss scheme was designed or "tuned" specifically to the suppress the first buckling mode of the particular plate, and compared to other more arbitrary forms of material placement. The results showed that the truss …
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Local buckling and crippling of composite stiffener sections
… (failure) of channel, zee, and I- and J-section stiffeners made of AS4/3502 graphite-epoxy unidirectional tape are studied by experiment and analysis. Thirty-six specimens were loaded in axial compression as intermediate length columns. Examination of the experimental results indicates the …
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Elastic and inelastic analysis of panel collapse by stiffener buckling
… buckling ("tripping") behavior of flanged stiffeners subjected to axial force, end moment, lateral pressure and any combination of these. The effects of cross-sectional distortion, postbuckling behavior of the plate (incorporated by considering the plate effective width), initial …
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Investigation of stiffener and skin interactions for pressure loaded panels
… stresses in the interface region between the stiffener and skin. Test panels were designed to study the stiffener and skin interactions using parameters typical of stiffened skins for aircraft fuselages. A total of six panels were tested. Two skin laminates, both 0.04 in. thick, and three …
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Calculation of skin-stiffener interface stresses in stiffened composite panels
A method for computing the skin-stiffener interface stresses in stiffened composite panels is developed. Both geometrically linear and nonlinear analyses are considered. Particular attention is given to the flange termination region where stresses are expected to exhibit unbounded characteristics. …
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Structural analysis of geodesically stiffened composite panels with variable stiffener distribution
… and out-of-plane bending stiffnesses of the stiffeners through the use of Lagrange multipliers in an energy method solution. The analysis is used to isolate the effect of various stiffener deformation modes on the buckling load and skin deformation patterns of geodesically stiffened panels …
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An Investigation of Classical Panel Stiffener Buckling Methods for Modern Airframe Applications
… as published in "The Elastic Stability of Tee Stiffeners" and the expansion of his work to asymmetric sections by E. F Bruhn in Analysis and Design of Aerospace Vehicle Structures. Vagueness in the relevance of geometric symmetry of the bulb exists between Windenburg's plate theory approach, …
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Load transfer in the stiffener-to-skin joints of a pressurized fuselage
… joint is modeled in an idealized manner; the stiffeners are mathematically permitted to pass through one another without contact, but do interact indirectly through their mutual contact with the shell at the joint. Discrete beams models of the stiffeners include a stringer with a symmetrical …
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The effect of stiffener dimensions on the buckling of webplates subjected to bending
… in the following thesis is that of the effect of stiffener dimension on the buckling of webplate subjected to bending. In Chapter one the problem of buckling is introduced generally and various examples of the use of horizontally stiffened webplates are mentioned. The theoretical background to the …
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Inelastic Analysis of Tripping Failure of Stiffened Steel Panels due to Stiffener Flange Transverse Initial Eccentricity
… of initial transverse eccentricity of the stiffener are ignored using such a method. Six panels were modeled and tested with ABAQUS, a finite element software package, and the results were compared to output from ULSAP, a closed-form ultimate strength analysis program. The ultimate …
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Structural analysis and optimum design of geodesically stiffened composite panels
… for the discrete flexural contribution of each stiffener through the use of Lagrange multipliers in an energy method solution. An analysis is also implemented for the buckling of simply supported anisotropic rhombic plates. Examples are presented to verify results of the stability analyses and …
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Prebuckling and postbuckling behavior of stiffened composite panels with axial-shear stiffness coupling
… panels with a centrally located I-shaped stiffener subjected to a uniform end shortening is presented. Axial-shear stiffness coupling is introduced by rotating the stiffener and/or prescribing skin laminates with membrane and bending stiffness coupling. A panel’s axial-shear coupling …
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Buckling Analysis of Composite Stiffened Panels and Shells in Aerospace Structure
Stiffeners attached to composite panels and shells may significantly increase the overall buckling load of the resultant stiffened structure. Initially, an extensive literature review was conducted over the past ten years of published work wherein research was conducted on grid stiffened composite …
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Deformation and tearing of uniformly blast-loaded quadrangular stiffened plates
… quadrangular mild steel plates of different stiffener configurations and sizes subjected to a uniform blast load are reported. The main objectives of this investigation are to determine the dynamic response of stiffened quadrangular plates subjected to uniform blast loads, to assess the …
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Behaviours of steel connections with unfitted stiffeners
… A critical issue arises when gaps exist between stiffeners and connected elements, referred to as unfitted stiffeners, which introduce uncertainties in the load-bearing capacity and deformation behaviour of these vital connections. This problem potentially compromises structural safety and leads …
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A multi-objective optimisation of a stiffened GFRP sandwich panel with a bilayer core structure, through finite element analysis
… in facesheet thickness, core thickness, and stiffener angle (input variables) impacted vertical deflection, panel mass, material cost (output variables), and Von Mises stresses. A preliminary design of the GFRP sandwich panel, based on literature, was analysed through finite element analysis …
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Parametric study of stiffened steel containment shell structures
… of industrial process facilities. The stiffeners are flat strips of rectangular section welded on to the outer surface of the shell, either over the whole length of the shell meridian or around the circumference of the shell. It is required to establish how the elastic buckling load and …
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Piezoelectric Control of Structures Prone to Instabilities
… by simply controlling the overall bending of the stiffener by piezo-electric actuators attached its tips. Control is exercised by self-sensing actuators by direct negative feedback voltages proportional to the bending strains of the stiffener. In a dynamic loading environment, where vibrations are …
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