Prestressed Concrete Design, 1/e

Chapter 7

Anchorage Zones

7.1 Introduction

The force in the prestressing steel is transferred to concrete either by bond in the case of pre-tensioned members or through bearing-type anchorages in post-tensioned members. In either case, the compression force is transferred to concrete in a concentrated manner (usually at the ends of the member).

Due to these concentrated forces, a very complex state of stress is developed, and in these regions the assumption of plane section remaining plane after loading will not be valid. Hence the stress distribution cannot be determined using the concepts of Strength of Materials (Sections 1 and 2 in Fig. 7.1(a)). These regions where complex stress distributions are developed due to transfer of prestressing ...