【作者】 王文可；

【导师】 何保康；

【作者基本信息】 西安建筑科技大学 ， 结构工程， 2007， 硕士

【摘要】 本文完成了550MPa高强冷弯薄壁型钢帽型截面两跨连续檩条的受力性能试验研究。本次试验对24根截面厚度分别为t=0.48mm、t=0.60mm、t=0.75mm、t=1.00mm；单跨长度l=1200～3000mm；截面形式为TOPSPAN 40与TOPSPAN 61两种帽型截面两跨连续檩条进行了受弯性能的试验研究。由于截面较为复杂，用现有规范理论计算极限承载力较为困难，本文首次利用有限条软件CUFSM结合冷弯薄壁型钢领域新的设计方法——直接强度法对两种截面各跨度的试验檩条进行了极限承载力的求解。计算结果表明：用直接强度法进行550MPa高强冷弯薄壁型钢帽型截面两跨连续檩条的计算是合理的，计算数值和试验数值偏差在允许的范围内。在试验结果的基础上，本文还采用大型有限元程序ANSYS9.0对本次试验进行了材料、几何非线性数值模拟分析，所得的有限元计算结果与直接强度法计算结果及试验结果三者之间的差别不大，进一步证实了本文的观点，也验证了试验的可靠性。本文还用直接强度法对试件截面下翼缘的不同加劲型式，不同试件的跨数进行了进一步的讨论，得出了相关直接强度法修正计算公式。更多还原

【Abstract】 This paper introduces experimental study on bearing capacity behavior of 550MPa high strength cold-formed steel continuous hat section purlins. This experiment included 24 continuous hat section purlins whose section thickness were t=0.48mm、t=0.60mm、t=0.75mm、t=1.00mm;Single spans were l=1200～3000mm; Section forms were TOPSPAN 40 and TOPSPAN 61. Those purlins’ bearing capacity behavior was tested. Because of the complexity of the sections, it is difficult to use the design rules in our current specification to calculate the load carrying capacity. So this paper firstly uses the finite strip method software CUFSM and the new design method in cold-formed steel field—Direct Strength Method to solve the specimens’ load carrying capacity. The result shows that using Direct Strength Method to calculate the 550MPa high strength cold-formed steel continuous hat section purlins’ load carrying capacity is reasonable. The differences between the calculated values and experimental values are allowed.Based on the experiment, the finite element program ANSYS 9.0 is applied to carry out the finite element nonlinear analysis of the specimens. The result of the finite element program, the result of the Direct Strength Method and the result of the experiment are much close to each other. The differences are allowable. These phenomena further prove the viewpoint of this paper and validate the reliability of this experiment.Moreover, this paper uses Direct Strength Method to further discuss the different section shapes and the different number of spans to find the related modified formulas.更多还原