这份44页的摘要概述了选择钢托梁的程序，这些钢托梁需要满足屋顶系统积水（即积水）产生的稳定性要求。本摘要提供了有关积水影响的背景信息和讨论，并利用SJI荷载表帮助设计师遵守SJI标准规范。讨论了托梁的拱度和节距在减少积水影响方面的好处，并展示了一种说明这些好处的技术。

This 44-page Digest outlines procedures for the selection of steel joists that are required to meet the stability requirements resulting from the accumulation of water on a roof system, i.e., ponding. This digest provides background information and discussion concerning the effects of ponding, and makes use of the SJI Load Tables as an aid in assisting designers to comply with the SJI Standard Specifications. The benefits of camber and pitch of joists in reducing the effects of ponding are discussed and a technique that accounts for these benefits is shown.