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薄壁圆形空心截面钢管(CHSs)广泛应用于风力发电机塔架。管材主要承受弯曲作用。已有文献对薄壁CHS钢管的抗弯性能进行了试验研究。为研究细长比对薄壁CHS非弹性和弹性弯曲性能的影响,进行了一系列弯曲试验。此外,考虑了焊接在钢管上加劲肋的影响。对16组径厚比(D/t)为75~300的CHS进行了抗弯试验,对其加载至破坏。试验结果表明,径厚比较小的试件,管材中部塑性变形导致失效。随着径厚比增大,局部屈曲现象更加明显。焊接在钢管上的加劲肋提高了试件的承载能力和延性。试验结果与AISC-LRFD、AS 4100以及欧洲规范中薄壁钢构件的计算结果进行了比较。结果表明,试验结果与AS 4100的计算结果相符。
Thin-walled circular hollow section steel tubes (CHSs) are widely used in wind turbine towers. Pipe is mainly subjected to bending. The literature has been carried out on the bending of thin-walled steel pipe CHS experimental study. To study the effect of slenderness on the inelastic and elastic bending behavior of thin walled CHS, a series of bending tests were performed. In addition, the effect of stiffeners welded on the steel pipe is considered. Sixteen sets of CHS with a diameter-to-thickness ratio (D / t) of 75 to 300 were subjected to a bending test and were loaded to failure. The test results show that the plastic deformation of the middle part of the pipe leads to the failure of the test piece with the smaller diameter and thickness. With the diameter to thickness ratio increases, the local buckling phenomenon is more obvious. The stiffener welded on the steel pipe enhances the bearing capacity and ductility of the specimen. The test results are compared with those of AISC-LRFD, AS 4100 and the European Code for thin-walled steel components. The results show that the test results agree well with the results of AS 4100.