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稳定问题是C型檩条在风吸力作用下的主要控制因素,该文基于薄壁杆件结构力学以及经典梁理论,提出了可以精确计算简支C型檩条在风吸力作用下的应力计算方法,该方法可以同时考虑压型钢板对檩条上翼缘侧向及扭转约束支撑的影响。依据相关试验资料以及数值计算结果,验证了该方法的精度。然后,基于该文所提出的方法,针对檩条横截面应力分布、侧向位移等力学性能,以及有无拉条等构造措施对其极限状态的影响进行了参数分析。研究表明,压型钢板对檩条上翼缘的侧移及扭转约束及拉条措施会改变檩条横截面应力分布及侧向位移,对其稳定极限状态产生显著影响。
Based on the structural mechanics of thin-walled bars and the classical beam theory, the paper puts forward a method to calculate the stress accurately under the suction of C-shaped purlins, The method can simultaneously consider the effect of the profiled steel plate on the lateral and torsional restraint support of the upper flange of the purlins. Based on the relevant experimental data and numerical results, the accuracy of the method is verified. Then, based on the method proposed in this paper, the parameter analysis of the influence of the mechanical properties such as stress distribution and lateral displacement on the cross-section of the bar and the influence of structural measures such as the presence or absence of braces on the ultimate state is carried out. The results show that the lateral displacement and torsional restraint of the upper flange of the profiled steel strip and the tensioning measures can change the stress distribution and the lateral displacement of the cross-section of the slat, and have a significant impact on the stability limit state.