Bond and Anchorage of Reinforcement in Concrete-New Zealand Code Provisions

This paper presents an overview of the provisions for anchorage and development of reinforcement in concrete for New Zealand concrete design code: NZS 3101:1995 (1). These provisions take into account the nature of high strength concrete (compressive strength f'(c) > 55 MPa (8000 psi)) and the expected performance under seismic loading. The criteria for development lengths for straight reinforcement (with specific surface deformations) and those for bars terminated with hooks are largely based on recent studies of Sozen and Moehle and ACI 318: 1989. Simple, conservative equations are presented along with less conservative equations of more complexity.