In the subsequent ABAQUS/Standard or ABAQUS/Explicit beam element analysis the beam elements requiring the meshed cross-section properties include the text file jobname.bsp as the general beam section data. The two-dimensional ABAQUS/Standard analysis writes the cross-sectional properties to an input-file-ready text file ( jobname.bsp). The meshed cross-section is used in ABAQUS/Standard to numerically calculate the properties required to characterize the structural response of the cross-section in a subsequent beam element analysis. The basic idea is to create a two-dimensional finite element model of the beam cross-section. Other examples include an airfoil-shaped rotor blade or wing, a layered composite I-beam (with fibers running along the length of the beam axis or perpendicular to it), etc.Īs shown in Figure 10.4.1≡, a meshed cross-section allows for a complex description of a beam cross-section: one which may include an arbitrary shape, multiple materials, multiple cells, and non-structural mass. In addition, the equivalent beam cross-section properties include information on stress recovery, such as the warping function and its derivatives.Ī typical example of a structure that requires a meshed cross-section is the hull of a ship for whipping analysis, where the ship's hull has a multi-cell and multi-material construction. The generated beam cross-section properties include axial, bending, torsional, and transverse shear stiffnesses mass, rotary inertia, and damping properties and the centroid and shear center of the cross-section. The beam properties are generated assuming a thick-walled (solid) cross-section with unconstrained out-of-plane warping, so open-section beam elements cannot use the beam cross-section properties generated from the meshed section (see ∻eam modeling: overview, Section 23.3.1). In these cases a meshed cross-section can be used to model the beam cross-section and to generate beam cross-section properties appropriate for subsequent use in a Timoshenko beam analysis.
The response of some structures is beam-like, yet the beam cross-section geometry or multi-material makeup of the cross-section do not permit the use of a predefined library beam cross-section.
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