RC Lecture 2

RC Lecture 2 - CIVL2007 Theory and Design of Structures II...

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Unformatted text preview: CIVL2007 Theory and Design of Structures II RC Component (27, 30 March 2007) page 37 TOPIC 3: SHORT COLUMNS - LECTURE NOTES - General Columns have been the cornerstone of construction for centuries – stone columns being traditionally used and more recently reinforced concrete. Parthenon, Greece (http://www.ancient- greece.org/architecture/parthenon.html) National Building Museum, Washington, USA (http://www.traditional- building.com/article/column.htm) Modern RC Framed Structure Columns are upright compression members, and the cross-sectional dimensions are small comparison with their overall length Columns serve the following purposes: • Support floor or deck systems (e.g. building or bridge) • Transfer the vertical live and dead loads from the floor or deck to the foundation CIVL2007 Theory and Design of Structures II RC Component (27, 30 March 2007) page 38 Column Shapes RC columns can be formed into many shapes and sizes. The following are typical column shapes and from herein all reference to columns will pertain to RC columns. Column Shapes (Warner et al. 1998) Column Shapes (Wang and Salmon 1998) CIVL2007 Theory and Design of Structures II RC Component (27, 30 March 2007) page 39 Column Classification The classification of a column depends upon the structural system (also known as restraint condition) into is framed into: 1. Braced Column: a column in a braced structure In a given direction, the lateral stability of the building is provided by bracing frames or shear walls to resist the horizontal loading. Lateral displacement in that particular direction is small or negligible for all columns in the building. See the following plan section for RC columns in a braced framing plan. RC columns in a framing plan 2. Unbraced Column: a column in an unbraced structure. In a structural system consisting of rigid frames, the lateral forces are resisted by the bending action of columns and beams. The lateral deflection of the columns can be large and certainly much larger than that of braced columns. CIVL2007 Theory and Design of Structures II RC Component (27, 30 March 2007) page 40 Short and Slender Columns In calculating the strength of a column as a compression member, the effective length as well as the strength of the materials of the column needs to be considered. In terms of slenderness, columns are classified as either short or long. 1. Short Column: A short column is one in which the ultimate load capacity is governed by the strength of the materials and the dimensions of the cross section. 2. Slender Column: Is one in which the ultimate load capacity is also influenced by slenderness which produces additional bending because of transverse deformation....
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RC Lecture 2 - CIVL2007 Theory and Design of Structures II...

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