APPLICATION OF THE NEW ZEALAND CONCRETE DESIGN CODE NZS 3101 TO HIGH STRENGTH CONCRETE

High strength concrete reduces the mass of concrete needed permitting smaller beam and column cross sections. Its high elastic modulus also reduces deflection and it has low creep deformation. The paper deals with provisions, in the New Zealand concrete design code NZS 3101, which need to be revised before being applicable to high strength concrete of compressive strength greater than 55 MPa. The revision can be partly based on results from past investigations, but further testing is required to determine properties peculiar to New Zealand made concrete, and seismic design needs to be studied. Details are given of the requirements for material properties in terms of the modulus of elasticity and modulus of rupture. Design criteria for flexure and axial load are discussed. Minimum beam reinforcement, flexural strength and confined columns are dealt with. High strength concrete has very brittle failure in compression if not confined by adequate transverse reinforcement. Shear resisting mechanisms involving aggregate interlock may not be so effective because the faces of the cracks are often smoother than in normal strength concrete due to possible fracture of the aggregate. Smaller cover thickness would reduce the width of surface cracks and lessen the effect of the loss of cover due to severe seismic loading. (TRRL) (Author/TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/05490219
• Corporate Authors:

  New Zealand Concrete Research Association

  Private Bag
  Porirua,   New Zealand 
• Authors:
  • Park, R
  • Li, Bo
• Publication Date: 1990-8

Language

• English

Media Info

• Features: References;
• Pagination: 5 p.
• Serial:
  • NEW ZEALAND CONCRETE CONSTRUCTION
  • Volume: 34
  • Publisher: CEMENT & CONCRETE ASSOCIATION OF NEW ZEALAND
  • ISSN: 0549-0219

Subject/Index Terms

• TRT Terms: Beams; Concrete; Cracking; Ductility; Failure; Modulus of elasticity; Reinforced concrete; Reinforcement (Engineering); Seismicity; Specifications; Strength of materials
• Geographic Terms: New Zealand
• ITRD Terms: 3472: Beam; 4755: Concrete; 5211: Cracking; 5909: Ductility; 5520: Failure; 5537: High strength; 5919: Modulus of elasticity; 8079: New Zealand; 4794: Reinforced concrete; 3471: Reinforcement (in mater); 5731: Seismic; 187: Specification (standard); 5544: Strength (mater)
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00623789
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Jul 31 1992 12:00AM