As is well known, the effective width depends on several factors, such as the cross-section width, the height of web, the spacing of span and so on.

• 影响箱形截面梁上翼缘有效宽度的因素很多,如上翼缘宽度、梁高、跨度以及结构体系等,通过大量计算表明宽跨比[翼缘部分宽度、箱室部分宽度与跨度的比值]是有效宽度的控制影响因素。