Analysis on overall stability of single-story single-span torsion structure
In this paper,the finite element software ABAQUS was used to establish a model of two-way single-story single-span spatial torsion steel frames with unrestrained top column and to analyze the elastic and elastoplastic flexion stress of torsion steel frames with different torsion angles,and compared with the non-torsional steel frame,to study the influence of different beams and column stiffness ratio and length ratio on the overall stability of the same column in the torsion steel frame.The following conclusions are drawn:(1)When subjected to vertical force,the non-torsion column-top unconstrained ideal space steel frame will change from lateral instability to non-lateral instability,and its stability capacity will increase rapidly;(2)Compared with the non-torsional structure model,the buckling stress of the torsional structure model is greatly reduced,and with the increase of torsion angle,the value of buckling stress decreases obviously,but the decreasing trend tends to be gentle;(3)The larger the slenderness ra-tio λ is,the lower the critical buckling stress is,the closer the elastic flexion stress and elastic-plastic flexion stress of torsional steel frame will be.
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