In this paper, we propose an availability analysis method for overlapping shared segment protection. We validate the proposed analysis method for different traffic demand matrices and different failure rate values. We show that the proposed analysis method achieves estimating the availability of a connection with a negligible error ratio. We then present two connection provisioning schemes, namely availability constrained generalized segment protection (AC-GSP), and shareability driven availability constrained generalized segment protection (SDAC-GSP) that are availability-aware adaptation of a conventional segment selection algorithm, namely the generalized segment protection (GSP). We evaluate the performance of these proposed schemes, and we show that as an enhancement to GSP, SDAC-GSP enhances the performance of AC-GSP in terms of the availability per connection, blocking probability and availability satisfaction ratio. However, it utilizes more wavelengths in comparison to AC-GSP since the more segments protects the links of the working path, the higher availability.