Anhui International Conference and Exhibition Center adopts big-spanned tubular space truss structure with the principal roof truss 153.8 m long and the maximum span 66 m.

安徽国际会展中心为大跨度空间管桁架结构，屋面主桁架总长 153.8m， 最大跨度66m。

This thesis also establishes the buckling differential equations with friction presents its solution method analyses the effect of friction and torque on tubular buckling and outlines the numerical relations between the maximum speed and critical axial force when drill strings are in sinusoidal buckling state .

建立了考虑井壁摩擦时的管柱屈曲微分方程及其求解方法，并分析了井壁摩擦、扭矩对钻柱屈曲的影响以及 管 柱 最大转速与正弦屈曲时临界轴向力的数值关系。