考虑翼缘横向弯曲的波纹腹板梁弯曲特性研究

Study on Corrugated Web Girders′s Bending Performance Considering Transverse Bending

波纹腹板工字钢梁是一种新型的梁结构形式,在面内载荷作用下,这种结构的翼缘会产生横向弯曲作用,导致翼缘弯曲应力复杂化。根据Abbas的横向弯曲理论,求解了面内集中载荷作用下、正弦波纹腹板工字钢简支梁的翼缘横向弯曲应力的解析式,给出了相同条件下其它波形的波纹腹板梁结构的弯曲应力的求解策略,采用有限元技术验证了提出的公式和方法,之后讨论了载荷移动时翼缘总弯曲应力的特性,提出"弯曲强度计算时必须考虑翼缘横向弯曲的作用,但在结构疲劳性能分析时可以忽略其新增的循环载荷的影响"的结论。

Corrugated web girder is a new type of structure. Transverse bending will be induced in the flanges der in-plane load, which makes the bending stresses in the flanges more complex. In accordance with the Abbas＇s transverse bending theory, a close form solution for the simply supported girder with sinusoidal corrugated web which bears in-plane concentrated load was established. Then an accessible approach to girders with other web pro- files which has the same parameters as the sinusoidal profile was given. FEA method was utilized to validate the proposed formula and approach. Furthermore, the total bending stress behavior of the flanges under movable con- centrated load was discussed. Finally, the suggestion that transverse bending should be considered in bending strength design but can be neglected in fatigue analysis was given.