本手册提供了适当的分析概念，以说明埋地钢管设计的原则，并试图纠正1958年修正的爱荷华州公式的误用。Reynold K.Watkins博士和其他人的最新工作在本书中介绍，以开发提供的外部荷载设计概念。埋地柔性钢管的目标是为埋地钢管（用于供水和废水）的结构设计和分析提供可靠的信息，符合行业最新的管道/土壤设计概念。 本手册结合管道/土壤相互作用的外部设计，阐述了内部压力设计、真空和外部流体压力分析，以及管道设计师可能遇到的许多其他非标准条件。本手册对参与管道设计和施工的学生和专业人员很有价值。

This manual provides appropriate analytical concepts to address the principles of buried steel pipe design and attempts to correct misusage of the 1958 Modified Iowa Formula. The most current work of Dr. Reynold K. Watkins and others is presented in this book to develop the external loading design concepts provided. The goal of Buried Flexible Steel Pipe is to offer sound information on the structural design and analysis of buried steel pipe - for water and wastewater - consistent with the latest pipe/soil design concepts of the industry. In conjunction with the external design of the pipe/soil interaction, the manual addresses internal pressure design, vacuum and external fluid pressure analysis, and many other non-standard conditions pipe designers will likely encounter. This manual will be valuable to students and professionals involved in pipe design and construction.