Thin-walled beam applications for structural analysis software

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Thin-walled members are commonly encountered in structural engineering applications. Examples include the large majority of steel members and concrete shear walls in high-rise buildings. Such structural elements exhibit complex structural response (i.e., global and local warping, and distortion) when exhibiting twist. Warping and distortion effects are not captured in 1D beam elements in conventional structural engineering software, albeit they can be successfully captured using 3D shell finite element analysis. However, the modelling and computational effort involved make such methods impractical for routine designs. The proposed research thus aims at providing a family of easy-to-use 1D finite element solutions for the analysis and design of thin-walled members. The solutions sought are intended to preserve the simplicity of 1D beam elements while capturing the complex 3D behavioral characteristics of thin-walled beams. Within this context, the proposed work targets three sets of applications: **(1) Static and dynamic analyses of thin-walled members under torsion**(2) Lateral torsional buckling analysis of built-up assemblies of thin-walled beams, and **(3) Static and dynamic analyses and free-vibration analysis of high-rise unsymmetrical buildings with shear walls under lateral loads.**The methodologies and algorithms developed are intended to be integrated into structural engineering software to provide practicing engineers easy-to-use and accurate analysis and design tools for structural members and assemblies.******