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探讨输电钢管杆横担抗弯强度及端部连接角焊缝抗弯强度的设计方法,开展3个相同规格设置不同加劲肋横担抗弯承载力特性试验、非线性有限元模拟和理论分析,探讨高压输电线路钢管杆截面为多边形的锥形横担抗弯承载力试验和设计理论。以锥度、径厚比为变化参数对锥形钢管横担进行一系列有限元模拟,并结合试验结果提出适合此类横担的抗弯承载力计算公式。研究结果表明:加劲肋对锥形钢管横担的极限承载力几乎没有影响,但能有效减小焊缝受力,避免焊缝的撕裂;随着锥度的降低,锥形钢管横担抗弯承载力降低,建议锥度取0.6;采用Q345钢材时,锥形钢管横担径厚比限值不应超过120。提出一个适用于锥形钢管横担抗弯承载力计算公式,并与有限元模拟值进行对比,可为工程设计提供参考。
The design method of flexural strength and cross-section fillet weld flexural strength of steel pipe stem is discussed. Three different specifications of stiffener transverse beam are tested, and the nonlinear finite element simulation and theoretical analysis are carried out. The test and design theory of the conical cross-section bearing capacity of polygonal cross-section of high-voltage transmission line are discussed. A series of finite element simulations of the cross-section of the conic steel tube were carried out with the parameters of taper and radius-to-thickness ratio, and the calculation formula of flexural capacity suitable for such cross-arm was proposed based on the experimental results. The results show that the stiffener has almost no effect on the ultimate bearing capacity of the cross-arm of the tapered steel pipe, but can effectively reduce the stress on the weld and avoid the tear of the weld. As the taper decreases, Bearing capacity decreased, the proposed taper to take 0.6; using Q345 steel, taper steel cross arm diameter to diameter ratio limit should not exceed 120. A calculation formula of flexural capacity of transverse beam for tapered pipe is proposed, and compared with the finite element simulation value, which can provide reference for engineering design.