Is transmitted solar radiation affected by window frame width?

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If you read the description of the WindowProperty:FrameAndDivider object, you'll see that it says "The window vertices that you specify in the FenestrationSurface:Detailed object are those of the glazed part of the window, not the frame. EnergyPlus automatically subtracts the area of the frame—determined from the glazing dimensions and the frame width—from the area of the wall containing the window."

So while the presence of the frame will introduce some shading of the glazing due to the frame outside projection, the width of the frame does not have any effect on transmitted solar.