Abstract: Based on National Load Standard and using formulae of elastic theory, this paper analyzed the effective widthes of load distribution for plate girder bridge. On the one hand, it proved the reasonable of provisions in new highway bridge norm; on the other hand, it gave out some additional explatations for longitudinal variation of effective widthes.

摘要： 本文根据我国的荷载标准,用弹性理论的公式对板的荷载有效分布宽度进行了分析,一方面论证了新《桥规》条文的合理性;另一方面对有效宽度沿跨长方向的变化作了补充阐明。