DESIGN CONSIDERATIONS OF PARTIALLY ENCASED COMPOSITE COLUMNS

The load-carrying capacity of partially encased composite columns subjected to eccentric load has been studied. Nineteen full-scale columns of partially encased sections were tested in two parallel investigations at the University of Jordan. IPE 200 x 100 x 22 steel sections (German standards) with a buckling length of 2.4 m were encased partially in concrete and tested to failure under eccentric axial load. For comparison, a twentieth column was tested as a bare steel column. All specimens were tested under minor axis bending. The variables studied in this research program were: the eccentricity of the applied load; the eccentricity ratio at the column ends; and the effect of concrete strength. The maximum strength of the tested columns was obtained by deflection methods, using Newmark's technique of numerical integration. Design values of the load-carrying capacity of the tested specimens were calculated by the Bridge Code: BS 5400. This paper presents theoretical and experimental results of the tested columns. Comparisons with design calculations are also presented. Experimental values of failure loads were in good agreement with the theoretical predictions, while the design calculations showed better agreement in the case of equal end eccentricities and for columns of higher strength concrete. Expressions, based on full plastic stress distribution, for calculating the ultimate moment of resistance of the column section are outlined. Moreover, simplified formulation of the moment capacity is suggested. The analytical results verify these simplifications.

• Corporate Authors:

  Thomas Telford Limited

  London,   United Kingdom 
• Authors:
  • Hunaiti, Y M
  • ABDEL FATTAH, B
• Conference:
  • PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS: STRUCTURES AND BUILDINGS
• Publication Date: 1994-2

Language

• English

Media Info

• Features: References;
• Pagination: p. 75-82
• Serial:
  • Volume: 104
  • Issue Number: 1

Subject/Index Terms

• TRT Terms: Bridge piers; Calculation; Composite materials; Concrete; Design; Failure; Loads; Mathematical analysis; Mathematical models; Steel
• ITRD Terms: 6471: Analysis (math); 3434: Bridge pier; 6464: Calculation; 9005: Composite; 4755: Concrete; 9011: Design (overall design); 5520: Failure; 5567: Load; 6473: Mathematical model; 4542: Steel
• Subject Areas: Design;

Filing Info

• Accession Number: 00663273
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: Aug 24 1994 12:00AM