tailieunhanh - Basic Theory of Plates and Elastic Stability - Part 23

Tài liệu tham khảo giáo trình cơ học kết cấu trong ngành xây dựng bằng Tiếng Anh - Yamaguchi, E. “Basic Theory of Plates and Elastic Stability” Structural Engineering Handbook Ed. Chen Wai-Fah Boca Raton: CRC Press LLC, 1999 - Composite Connections | Leon R. Composite Connections Structural Engineering Handbook Ed. Chen Wai-Fah Boca Raton CRC Press LLC 1999 Composite Connections Roberto Leon School of Civil and Environmental Engineering Georgia Institute of Technology Atlanta GA Introduction Connection Behavior Classification PR Composite Connections Moment-Rotation M-0 Curves Design of Composite Connections in Braced Frames Design for Unbraced Frames References Introduction The vast majority of steel buildings built today incorporate a floor system consisting of composite beams composite joists or trusses stub girders or some combination thereof 29 . Traditionally the strength and stiffness of the floor slabs have only been used for the design of simply-supported flexural members under gravity loads . for members bent in single curvature about the strong axis of the section. In this case the members are assumed to be pin-ended the cross-section is assumed to be prismatic and the effective width of the slab is approximated by simple rules. These assumptions allow for a member-by-member design procedure and considerably simplify the checks needed for strength and serviceability limit states. Although most structural engineers recognize that there is some degree of continuity in the floor system because of the presence of reinforcement to control crack widths over column lines this effect is considered difficult to quantify and thus ignored in design. The effect of the floor slabs has also been neglected when assessing the strength and stiffness of frames subjected to lateral loads for four principal reasons. First it has been assumed that neglecting the additional strength and stiffness provided by the floor slabs always results in a conservative design. Second a sound methodology for determining the M-Ớ curves for these connections is a prerequisite if their effect is going to be incorporated into the analysis. However there is scant data available in order to formulate .