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檩条在实际应用中总是受到屋面板对它的侧向支撑和扭转约束作用,即蒙皮支撑作用。工程设计时考虑风吸力下蒙皮对檩条的支撑作用能够有效降低经济成本,但是目前我国有关规范给出的设计算法过于复杂,极大地降低了工程设计效率。引入经典的有限元模型,采用参数分析方法,讨论了檩条腹板高厚比、檩条翼缘宽厚比、檩条侧向长细比、蒙皮对檩条的扭转约束刚度4种参数对风吸力下Z形檩条弯扭屈曲临界荷载的影响。在参数分析的基础上,提出了一个考虑蒙皮支撑作用的风吸力作用下Z形檩条临界荷载简化计算公式。对比简化公式算法与我国门式刚架规程算法,发现两种方法计算结果非常接近,且与有限元分析结果相近,验证了公式的准确性。简化算法过程和形式简单,能高效准确地获得蒙皮支撑的Z形檩条在风吸力作用下的临界承载力,可提高工程设计效率。
Sliver in practice is always subject to the roof of its lateral support and torsional constraints that the role of skin support. Considering the supporting effect of skin under wind suction on purlins during engineering design can effectively reduce the economic cost, however, the design algorithms given by China’s relevant norms are too complicated and greatly reduce the engineering design efficiency. The classical finite element model is introduced. By using the parameter analysis method, four kinds of parameters, such as the ratio of thickness to thickness of the web, the width-to-thickness ratio of the slat flange, the lateral slenderness ratio of the slat, The Influence of the Critical Load of Curved Bending and Twisting Buckling. On the basis of the parameter analysis, a simplified formula for calculating the critical load of Z-shaped purlins under the action of wind suction is proposed. Comparing the algorithm of simplified formula and the method of gantry rigid frame in our country, it is found that the calculated results of the two methods are very close, and the results are similar to those of the finite element analysis, which verifies the accuracy of the formula. The simplified algorithm process and the simple form can effectively and accurately obtain the critical bearing capacity of Z-shaped purlins supported by the skin under the action of wind suction, which can improve the engineering design efficiency.