NEHRP Clearinghouse
- Title
- Shear Transfer Under Cyclically Reversing Loading Across an Interface Between Concretes Cast at Different Times.
- File
- PB275258.pdf
- Author(s)
- Mattock, A. H.
- Source
- National Science Foundation, Washington, D.C., June 1977, 100 p.
- Identifying Number(s)
- SM77-1
- Abstract
- The total study is concerned with the shear transfer strength of reinforced concrete subject to both single direction and cyclically reversing loading, the latter simulating earthquake conditions. The primary topics studied were the influence of the existence in the shear plane of an interface between concretes cast at different times, and the influence of reinforcing bar diameter on shear transfer across a crack in monolithic concrete. This Part 2 of the Final Report is concerned with shear transfer across interfaces between concretes cast at different times, when subject to cyclically reversing shear. Cyclically reversing and monotonic shear transfer tests of companion initially cracked specimens are reported. Both composite and monolithic specimens of normal weight concrete were tested. The interfaces of all composite specimens were roughened. In some cases bond at the interface was deliberately broken. It was found that for a roughened interface with good bond, the shear transfer behavior was similar to that of comparable initially cracked, monolithic concrete. If the bond at the interface is broken, the shear transfer behavior under cyclic loading deteriorates rapidly and the shear strength is only about 0.6 of that under monotonic loading.
- Keywords
- Shear transfer; Precast concrete; Construction joints; Shear properties; Earthquake engineering; Shear strength; Cyclic loads; Cracks; Concrete construction