PhaethonFRP is a Windows executable file without GUI (console application - Windows 64 bit Binaries) that produces the axial stress - axial strain envelopes for FRP-Confined circular or rectangular reinforced concrete columns under axial compression. 

Fiber-reinforced polymer (FRP) jackets are an effective technique for reducing the seismic vulnerability of reinforced concrete (RC) columns by enhancing their compressive strength and ductility. For circular columns, the proposed modification to the fib constitutive model accounts for the combined confinement effects of existing steel reinforcement and the FRP jacket, rather than considering the FRP jacket alone. 

For rectangular columns, an iterative material model distinguishes between the triaxially confined core and the surrounding region subjected to biaxial compression due to the FRP jacket. The PhaethonFRP© console application incorporates these models to evaluate the contribution of FRP jackets to the compressive strength and ductility of circular and rectangular RC columns in terms of axial stress and strain, accounting for FRP jacket failure.

* PhaethonFRP download link provides gnu general public license version of the software.

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The stand-alone Windows program Phaethon with user’s interface written in C++ offers analysis of shear - critical reinforced concrete columns to its user both for rectangular but also for circular reinforced concrete columns.

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