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H型钢剖分T型钢压杆在压力作用下,屈曲性能有如下特点:一是当沿形心纵轴受压而绕对称轴屈曲时杆件将发生弯扭变形;二是当沿剪切中心轴受压而绕对称轴屈曲时弯曲变形与扭转变形不再耦合。因此,形心受压时的屈曲荷载低于剪切中心受压时的屈曲荷载,上述结论对理想压杆是适用的。然而,对于工程中具有初弯曲、初偏心以及残余应力的剖分T型钢压杆而言,将压力由形心轴移至剪切中心轴后,整体失稳时的承载能力会降低,采用有限元建模计算剖分T型钢压杆承载力的分析结果也可证实上述结论。
H-section steel T-bar split under pressure, the buckling performance has the following characteristics: First, along the centripetal axis along the longitudinal axis of compression and buckling around the axis of symmetry when the bar will be bending and torsion deformation; Second, along the shear center Axis compression and bending around the axis of symmetry bending deformation and torsional deformation is no longer coupled. Therefore, the buckling load at the centroid compression is lower than the buckling load at the shear center compression. The above conclusion is applicable to the ideal compression rod. However, for split T-shaped steel bars with initial bending, initial eccentricity and residual stress in the project, the carrying capacity under global instability will decrease after the pressure is moved from the centroid to the shear center axis. With the limited Meta-modeling calculation of the T-shaped steel bar bearing capacity analysis results can confirm the above conclusion.