SLENDERNESS EFFECTS IN REINFORCED CONCRETE, STEEL AND COMPOSITE COLUMNS

In this paper the methods of taking account of slenderness in reinforced concrete, steel and composite columns are reviewed. The magnitude of the discrepancies in the strengths forecast by these methods is examined, with particular consideration of the discrepancies between reinforced concrete and composite design. The design of short columns is not considered. The options in cp 110 are reviewed so that the most suitable design method is selected for the comparison. In this paper comparisons with composite design are made not with the proposed steel design method but with the contemporary cased strut method. Thus one avoids the complications of lateral-torsional instability and warping restraints which are of no concern over the range of slenderness permitted in the design of composite columns. As with rectangular reinforced concrete columns, lateral-torsional instability can occur in slender columns. Although not conceived for use in these situations, the design method for slender composite columns has been shown to give strengths generally compatible with those for steel and reinforced concrete design, which may be regarded as extreme forms of composite construction. (TRRL) (TRRL)

• Corporate Authors:

  Institution of Civil Engineers

  One Great George Street, Westminster
  London,   United Kingdom  SW1P 3AA
• Authors:
  • Smith, DGE
• Conference:
  • Institution of Civil Engineers, Proceedings, Pt2
• Publication Date: 1980-6

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 343-357
• Serial:
  • Volume: 69
  • Issue Number: PT2

Subject/Index Terms

• TRT Terms: Bridge piers; Columns; Composite structures; Design methods; Forecasting; Instability; Reinforced concrete; Steel; Strength of materials; Thinness
• Uncontrolled Terms: Slenderness ratio
• ITRD Terms: 3434: Bridge pier; 9005: Composite; 4755: Concrete; 9011: Design (overall design); 9102: Method; 4794: Reinforced concrete; 5513: Slenderness; 4542: Steel
• Subject Areas: Bridges and other structures; Design; Highways;

Filing Info

• Accession Number: 00324839
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Jun 12 1981 12:00AM