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将连接在檩条腹板上的拉条看成是檩条的侧向弹性支座,根据板壳理论推导檩条腹板变形,得到考虑腹板变形的拉条刚度,经过数值分析修正,提出具有很好精度的拉条刚度计算公式。Z形截面檩条在风吸力作用下,拉条内的反力很小,因此将拉条简化为侧向刚性支承还是弹性支承,对应力的影响非常有限,拉条截面的畸变变形也很小。对于Z形截面的应力计算,EC3规程采用的计算方法、双向弯扭的计算方法以及绕平行轴单向弯曲的计算方法,应力结果都有良好的精度。
According to the shell theory, the deformation of the webs is deduced, and the stiffness of the web considering the deformation of the webs is obtained. After numerical analysis and correction, it is put forward that there is a very good Accuracy of the formula for calculating the stiffness of the bracelet. The Z-shaped cross-section of the purlins under wind suction, the reaction force within the pull bar is small, so to simplify the brace for lateral rigid support or elastic support, the impact on the stress is very limited, the deformation of the bracelet distortion is also small. For Z-section stress calculations, EC3 procedures used in the calculation method, the calculation method of two-way bending and bending and unilateral bending around the parallel axis calculation method, the stress results have good accuracy.