A Three-dimensional photoelastic investigation of the stress distribution in the anchorage zone of post-tensioned beams

Abstract

Three-dimensional photoelastic investigations were carried out on eight photoelastic models to study the behaviour of end blocks by establishing the magnitude and distribution of stresses on critical planes. The effect of area concentration ratio, cable duct, position of the anchorage unit and interactive effect of multiple anchorages has been investigated. Stress concentrations under the anchorage unit were studied and the role and magnitude of critical sub-surface shears established.

Recommendations have been made for the design of the anchorage block. Concrete blocks were carried out to study the failure mechanism of end blocks.