Work

Shear performance of 25 m full-scale prestressed UHPC-NC composite I-beam without stirrups

Year: 2024

Type: article

Abstract: The burgeoning preference for prestressed Ultra-High Performance Concrete (UHPC) I-girders without stirrups, stemming from the remarkable tensile strength of UHPC, indicating a promising trajectory for future construction endeavors. This research delved into real-world engineering scenarios, focusing on shear tests conducted on both 9.0 m and 6.5 m segments cut off a 25.0 m full-scale prestressed UHPC-NC composite I-beam without stirrups, which had already undergone flexural failure. Employing Finite Element Models (FEM), the study scrutinized and forecasted test outcomes. In asymmetric loading shear test, the end with a lower shear span ratio and higher shear capacity fails earlier. Subsequently, a validated FEM, reflective of the tested beam, was established. Leveraging this validated model, a comprehensive analysis ensued, probing into parameters influencing the shear performance of the full-scale prestressed UHPC-NC composite I-beam without stirrups. Parameters under study encompassed the prestressed tension level, web width, and shear span ratio. Findings revealed minimal impact of prestressed tension level on the shear performance of the tested beam, with augmented web width substantially enhancing stiffness and shear capacity. Conversely, an increase in shear span ratio correlated with a decline in shear performance of the tested beam. Finally, it juxtaposed various predictive equations for the shear capacity of the beams without stirrups from disparate global locales, advocating for the utilization of equations outlined in the French equation to predict the shear capacity of the tested beams in this study, aiming for minimized margin of error and conservative estimation.

Source: Case Studies in Construction Materials

DOI: 10.1016/j.cscm.2024.e03942