Validation of a novel mechanical model for geometrically and passively confined concrete

Investigating the load-bearing characteristics of the joint region of precast concrete elements under compression is crucial for practical applications, such as in tunnel linings. The study introduces a novel mechanical model to predict the load-bearing capacity of load transfer zones with both geometric confinement caused by load distribution and passive confinement caused by transverse reinforcement. Two design approaches according to the current draft of the Eurocode 2 (EC2) and the novel mechanical model are used for a comparative validation based on experimental tests done at TU Wien and data from literature. The test data relies on centrically loaded test specimens with a simple geometry to exclude side effects which could influence the results regarding geometric and passive confinement. The comparative validation shows the good performance of the novel mechanical model and its advantages in comparison to the models according to the EC2-draft. Due to the mechanical basis, the novel mechanical model can be adapted for more complex geometries and reinforcement layouts for the design of tunnel segments.