Advanced Numerical Analysis of CFRP-Strengthened Concrete Beams Using Splay Anchor Configurations

This project focuses on conducting a numerical investigation on the structural performance of concrete beams strengthened with CFRP sheets anchored by innovative splay anchors. By evaluating the impact of varying anchor configurations, this study aims to provide effective solutions for preventing debonding and enhancing the flexural capacity of CFRP-strengthened beams.

The finite element (FE) model predicted peak load with over 95% accuracy, confirming its reliability for simulating CFRP-anchored strengthening systems.

Beam geometry significantly influenced anchor efficiency and CFRP utilisation. T-section beams enabled full mobilisation of CFRP tensile capacity at 100 mm embedment depth, whereas rectangular beams remained governed by concrete crushing, limiting anchor effectiveness.

An embedment depth of 100 mm in T-beams resulted in rupture failure of the CFRP sheet, confirming full tensile engagement without premature debonding.

The optimal anchor spacing was identified as 140 mm, providing the highest flexural performance and promoting desirable rupture failure modes. Wider spacings led to reduced capacity and premature debonding.

A non-effective anchorage zone was identified within approximately 16% of the shear span from each beam end. Anchors placed in this region did not contribute meaningfully to load capacity, supporting anchor layout optimisation by eliminating non-contributory end anchors.