The effect of short cantilever beam formation on the structural behavior of precast post-tensioned connections

This study is performed in order to determine the effect of the short cantilever beam formation under beam element in precast post-tensioned connections to the structural capacity of the system. With this purpose, four specimens are designed for the tests. One of them (SCP0) is without short cantilever beam and the three others (SCP1, SCP2 and SCP3) are formed with short cantilever beam in different dimensions. The investigation is made in both experimental and numerical framework. In the experimental part of this study, displacement controlled analysis is done and hysteresis loops of specimens are obtained between 0% and 4% story drift values. In the numerical part, these four specimens are modelled in SAP2000V.14 and nonlinear static analysis is used to obtain the load-story drift curves. The structural capacities are observed in terms of connection stiffness and ductility. The results obtained from numerical studies are compared with the experimental ones. Closer results are achieved in both frameworks. As a result, the contribution of short cantilever beam to the structural capacity of the system is clearly seen and proposed as efficient solution for higher ductility demands.

► In modeling, multi-spring contact element was used. ► Results show that short cantilever beam enhances the structural capacity of precast connection. ► This design provides that the structural system withstands severe deformations. ► Fifty eight percent contribution to the load capacity at 4% drift is observed when SCP0 and SCP3 are compared. ► Secant stiffness of all specimens is degraded with the gap opening at beam-column interface.