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Basic Theory of Plates and Elastic Stability - Part 19

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 - Plate and Box Girders | Elgaaly M. Plate and Box Girders Structural Engineering Handbook Ed. Chen Wai-Fah Boca Raton CRC Press LLC 1999 Plate and Box Girders Mohamed Elgaaly Department of Civil Architectural Engineering Drexel University Philadelphia PA 19.1 Introduction 19.2 Stability of the Compression Flange Vertical Buckling Lateral Buckling Torsional Buckling Compression Flange of a Box Girder 19.3 Web Buckling Due to In-Plane Bending 19.4 Nominal Moment Strength 19.5 Web Longitudinal Stiffeners for Bending Design 19.6 Ultimate Shear Capacity of the Web 19.7 Web Stiffeners for Shear Design 19.8 Flexure-Shear Interaction 19.9 Steel Plate Shear Walls 19.10In-Plane Compressive Edge Loading 19.11Eccentric Edge Loading 19.12Load-Bearing Stiffeners 19.13Web Openings 19.14Girders with Corrugated Webs 19.15Defining Terms References 19.1 Introduction Plate and box girders are used mostly in bridges and industrial buildings where large loads and or long spans are frequently encountered. The high torsional strength of box girders makes them ideal for girders curved in plan. Recently thin steel plate shear walls have been effectively used in buildings. Such walls behave as vertical plate girders with the building columns as flanges and the floor beams as intermediate stiffeners. Although traditionally simply supported plate and box girders are built up to 150 ft span several three-span continuous girder bridges have been built in the U.S. with center spans exceeding 400 ft. In its simplest form a plate girder is made of two flange plates welded to a web plate to form an I section and a box girder has two flanges and two webs for a single-cell box and more than two webs in multi-cell box girders Figure 19.1 . The designer has the freedom in proportioning the cross-section of the girder to achieve the most economical design and taking advantage of available high-strength steels. The larger dimensions of plate and box girders result in the use of slender webs and flanges making buckling problems .