LONG-TERM SERVICE-LOAD BEHAVIOUR OF SIMPLY SUPPORTED PROFILED COMPOSITE SLABS

This paper is concerned with the time-dependent behaviour of simply supported profiled composite slabs which are used as both the floor systems for buildings and bridge deck construction. Creep and shrinkage strains and their effects on the time-dependent behaviour are considered using the age-adjusted effective modulus method and a relaxation procedure in the time domain. The theoretical model allows the analysis of both a cracked and an uncracked cross-section. A numerical integration technique is implemented in order to monitor the member behaviour of simply supported composite slabs. A parametric study is undertaken to study the effects of span to depth ratio, slab depth, material properties and applied service loads on the long-term behaviour of these slabs. The effects which are monitored in the parametric study are the long-term strains, stresses and deflections. The results of long-term deflections are then compared with the current British code for composite slab construction, BS 5950: Part 4, and are shown to agree well. However, the method shows that the long-term stresses induced from the concrete into the steel are increased over time and suggests that these also be incorporated in international codes, particularly for use in buildings with a varying load history. (A)

• Corporate Authors:

  Thomas Telford Limited

  London,   United Kingdom 
• Authors:
  • UY, B
• Conference:
  • PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS: STRUCTURES AND BUILDINGS
• Publication Date: 1997-5

Language

• English

Media Info

• Features: References;
• Pagination: p. 193-208
• Serial:
  • Volume: 122
  • Issue Number: 2

Subject/Index Terms

• TRT Terms: Beams; Bridges; Composite materials; Creep; Deflection; Deformation; Mathematical models; Reinforced concrete; Shrinkage; Slabs; Steel; Stresses; Time
• ITRD Terms: 3472: Beam; 3455: Bridge; 9005: Composite; 4732: Creep (mater); 5586: Deflection; 5595: Deformation; 6473: Mathematical model; 4794: Reinforced concrete; 4743: Shrinkage; 3491: Slab; 4542: Steel; 5575: Stress (in material); 5414: Time
• Subject Areas: Bridges and other structures;

Filing Info

• Accession Number: 00738268
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: Jul 30 1997 12:00AM