冷弯薄壁U型钢-混凝土组合梁考虑滑移效应的挠度计算

Deflection calculation of the Thin-Walled U Steel-Concrete Composite Beams Regarding Slip Effect

以薄壁U型钢-混凝土组合梁为研究对象,推导了组合梁的滑移微分方程并在此基础上建立了组合梁在跨中两点对称荷载作用下的挠度计算公式。分别采用文中的挠度计算公式和现行规范中的方法计算了6根薄壁U型钢-混凝土组合梁在此荷载作用下的跨中挠度值,并与相关文献的试验值进行了对比分析。结果表明:按文中的挠度计算方法与按现行规范中的方法计算的跨中挠度值误差不到1%,并且按这两种方法计算的组合梁跨中挠度值与试验值的平均误差较小,这说明现行规范中的挠度计算公式不仅可以用来计算传统工字型钢-混凝土组合梁的挠度,而且和文中提出的挠度计算公式一样也可以用来计算薄壁U型钢-混凝土组合梁的挠度。

The thin- walled U steel- concrete composite beams is taken the study object, the slip differential equation of the composite beams and deflection calculation formulas under the two point symmetrical load are presented. The midspan deflection value of the 6 thin - walled U steel - concrete composite beams under the two polint symmetrical load are calculated respectively through using deflection calculation formulas in this paper and present code, and compared with the experiment result of related literature, it is shown that the error in midspan deflection value based on the two different deflection calculation formulas in this paper between present code is no less than 1%, and compared with text rusult the average error in midspan deflection values based on the two different method are small, that shows the deflection calculation method of present code is not only suitable to the traditional I steel - concrete composite beams, but also suitable to the U steel - concrete composite beams like the method in this paper.