Applying the previous instrument, draw three more stripes, having the same parameters:

The Opacity on the layers is of  60% too.
Blending Options-Gradient Overlay

Gradient’s parameters:

Pick up now the Ellipse Tool (U) to represent a circle and then press the Alt button to cut out a circle’s sector, the way it is demonstrated next picture.

Fill 0% on the layers.
Blending Options-Drop Shadow

Blending Options-Gradient Overlay