Title: Design Implications of Current Research on High-Strength Concrete

Author(s): Arthur H. Nilson

Publication: Symposium Paper

Volume: 87

Issue:

Appears on pages(s): 85-118

Keywords: beams (supports); columns (supports); compressive strength; confined concrete; creep properties; deflection; diagonal tension; ductility; high-strength concretes; lightweight concretes; loads (forces); prestressed concrete;

DOI: 10.14359/6526

Date: 9/1/1985

Abstract:
Research at Cornell University over an eight, year period, on concrete with comprehensive strenght in the range from 6000 to 12,000psi 41-83MPa) has established a good basic for understanding the fundamental nature of the material and has also provided information on engineering properties such as moduls of elatisity, tensile strength, creep coeficient possion, ratio, rate of strength gain with age, and strain limit values. Some of these are reviewed briefly. The main purpose of the paper is to summarize more recent Cornell research dealing with the behavior of reinforced and prestressed concrete structural members, made using high strength concrete. Test have included axially-loaded members with varying amounts of spiral confinment steel, flexural critical beams with varying amounts of tensile and compressive reinforcement, and stirupps, reinforced concrete beams under sastained load of 3 years duration, shear critical reinforced concrete beams. It was found that while many provisions of the 1983 ACI code are applicable to high strength concrete materials and members certain code provisions must be reexamined, modified, or limited to insure structural saftey and servability.