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分析跨中设置1道拉条的C形截面檩条承受风吸力的情况(拉条作为檩条的侧向弹性支座),将分析结果与ANSYS板壳有限元的分析结果进行对比。结果表明:除拉条截面及两端支座附近外,上翼缘水平反力与ANSYS模型的结果符合很好,拉条反力也符合;C形截面沿檩条长度的应力,除拉条截面及附近区域外,弯扭理论分析与ANSYS有限元分析结果吻合;在拉条截面,卷边尖端的应力受畸变影响很大;C形截面压应力控制点采用EC3的方法总是偏于安全;但拉应力控制点是上翼缘卷边尖端,应在单向弯曲应力计算公式上增加畸变应力。
The cross-section of the cross-section of the C-section of the cross-section was analyzed for the wind suction force (the bracing as the lateral elastic support). The analysis results were compared with the ANSYS shell finite element analysis results. The results show that the horizontal reaction force of the upper flange is in good agreement with the ANSYS model except for the section near the brace and the support near the two ends. The reaction force of the brace is also in accord with the stress of the C-shaped brace along the length of the brace. In the vicinity of the area, the analysis of bending and torsion is consistent with the results of ANSYS finite element analysis. In the section of the bracelet, the stress at the tip of the curl is greatly affected by the distortion. The method using EC3 at the C-section compressive stress control point is always partial to safety; Tensile stress control point is the tip of the upper flange curl, should be one-way bending stress calculation formula to increase the distortion stress.