1Harajli M, et al. Externally prestressed members: Evaluation of second-order effects. Journal of Structural Engineering, ASCE, 1999,125(10): 1151
2Ariyawardena N D, et al. Prestressing with unbonded internal or external tendons: Analysis and computer model. Journal of Structural Engineering, ASCE, 2002, 128(12): 1493