Refined Numerical Simulation-Based Performance Analysis of Precast Segmental Prestressed Cap Beams

Abstract

To address two critical challenges in the numerical modeling of precast segmental structures—namely, post-tensioned prestress simulation and adhesive joint representation—this study proposes a refined finite element modeling approach. This method incorporates a nearest point matching algorithm during prestress application, resolving issues such as modeling complexity and low computational efficiency in traditional tendon-concrete node matching. For adhesive joint simulation, a cohesive contact element based on fracture mechanics is adopted, enabling the characterization of tensile-shear coupled failure under combined loading conditions. To validate the method, a precast segmental prestressed cap beam from a real-world project was analyzed under prestressing and service load scenarios. The results demonstrate that the proposed approach is efficient, rational, and practically applicable, providing reliable technical support for high-fidelity numerical simulations of prefabricated structures.

Keywords

precast segmental structures / post-tensioned prestressing / adhesive joints / cap beams / cohesive contact elements

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