Fibre Reinforced Concrete (FRC) is an attractive material for segmental lining reinforcement for totally or partially replace the traditional steel bar cage. Over the last decades, numerous research studies have been devoted on the application of FRC to precast tunnel segments, highlighting the effectiveness of fibres as reinforcement, by considering different load cases occurring during segment manufacturing, installation and service condition. One of the critical loading scenarios is the application of high loads on small contact surfaces; this could occur during the excavation process, due to the loads applied by the boring machine on the lining, or in the final stage, when high compressive stresses are transmitted between longitudinal joints. Accordingly, several Authors investigated the behaviour of FRC prisms subjected to high concentrated loads by means of experimental tests. However, only few analytical models exist in the literature that allow the calculation of splitting bearing capacity of FRC elements under concentrated loads. The aim of this paper is to contribute to fill this lack by introducing a new formulation to calculate bearing capacity and crack depth when the failure mechanism is governed by splitting collapse.
Local splitting bearing capacity under high concentrated load of Fibre Reinforced Concrete elements: an analytical model
Trabucchi Ivan;Giuseppe Tiberti;Giovanni Plizzari
2023-01-01
Abstract
Fibre Reinforced Concrete (FRC) is an attractive material for segmental lining reinforcement for totally or partially replace the traditional steel bar cage. Over the last decades, numerous research studies have been devoted on the application of FRC to precast tunnel segments, highlighting the effectiveness of fibres as reinforcement, by considering different load cases occurring during segment manufacturing, installation and service condition. One of the critical loading scenarios is the application of high loads on small contact surfaces; this could occur during the excavation process, due to the loads applied by the boring machine on the lining, or in the final stage, when high compressive stresses are transmitted between longitudinal joints. Accordingly, several Authors investigated the behaviour of FRC prisms subjected to high concentrated loads by means of experimental tests. However, only few analytical models exist in the literature that allow the calculation of splitting bearing capacity of FRC elements under concentrated loads. The aim of this paper is to contribute to fill this lack by introducing a new formulation to calculate bearing capacity and crack depth when the failure mechanism is governed by splitting collapse.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
