SDI隔板设计手册第三版DDMO3继续了本手册第一版和第二版中介绍的建筑物抗剪强度的演变。该手册基于钢甲板研究所及其成员和准成员公司赞助的研究、测试和分析，自1965年以来，在SDI技术顾问拉里·D·卢特雷尔博士的指导下。第三版基于2001年《北美冷成型钢结构构件设计规范》的2004年补充版。本手册解释了使用钢屋顶板或复合钢地板板计算横隔梁承载力的方法，以及横隔梁荷载表的使用。根据《北美冷弯型钢结构构件设计规范》，对隔板表进行了修订和调整，以便于使用许用应力设计（ASD）或荷载和阻力系数设计（LRFD）方法。 该手册有130多页使用焊缝、螺钉和其他机械紧固件的膜片载荷表，是设计专业的综合资源。ASD和LRFD设计有16个示例问题，以及检查紧固件剪切和拉伸组合效应的方程式。

The Third Edition, DDMO3, of the SDI Diaphragm Design Manual continues the evolution of building shear resistance presented in the First and Second Editions of this manual. The manual is based on research, testing and analysis sponsored by the Steel Deck Institute and its member and associate member companies, under the direction of Dr. Larry D. Luttrell, Technical Advisor to the SDI, since 1965.The Third Edition is based on the 2004 Supplement of the 2001 North American Specification for the Design of Cold-Formed Steel Structural Members. The manual explains the method developed to calculate the capacity of diaphragms using steel roof decks or composite steel floor decks and the use of the diaphragm load tables.The diaphragm tables have been revised and adapted for ease of use with either the allowable stress design (ASD) or load and resistance factor design (LRFD) methods according to the North American Specification for the Design of Cold-Formed Steel Structural Members. With over 130 pages of diaphragm load tables using welds, screws and other mechanical fasteners, the manual is a comprehensive resource for the design profession. There are 16 example problems for ASD and LRFD design and equations to check fasteners for the combined effect of shear and tension.