TAILIEUCHUNG - Calculation of loading induced tendon slip in beams prestressed with external tendons
In this paper, a computing method for the tendon slip based on the force equilibrium condition at deviators was proposed. The proposed method for the evaluation of tendon slip was presented in a general form by taking into account all possibilities of tendon slip at deviators, and several factors found to be important that affect the tendon slip, such as effects of the slippage at two adjacent deviators, friction, change of tendon angles during the applied load, etc. | Vietnam Journal of Mechanics, VAST, Vol. 28, No. 4 (2006) , pp. 207 - 218 CALCULATION OF LOADING-INDUCED TENDON SLIP IN BEAMS PRESTRESSED WITH EXTERNAL TENDONS PART II: NUMERICAL ANALYSIS Bur KHAC DIEP AND LAM Huu QUANG Department of Bridge 8 Tunnel Engineering, Institute of Transport Science 8 Technology Abstract. In this paper, a computing method for the tendon slip based on the force equilibrium condition at deviators was proposed. The proposed method for the evaluation of tendon slip was presented in a general form by taking into account all possibilities of tendon slip at deviators, and several factors found to be important that affect the tendon slip, such as effects of the slippage at two adjacent deviators, friction, change of tendon angles during the applied load, etc. The validation of the proposed method was verified by comparing with the experimental results. The predicted results showed a close agreement with the experimental observation. 1. INTRODUCTION The benefit of using the external prestressing had already been proved not only the strengthening of the existing bridges, but also the construction of new bridges. This indicates by a huge number of bridge constructions that have been built by using the external prestressing technique over the world in recent years. The world-wide spread of external prestressing leads to the results of ease construction, time-saving and costeffective bridges thanks to its inherited characteristics from the early days of prestressing development. However, as the external tendons are unbonded with concrete beams except having contact at the deviator points, the stress variation in the external tendons under .the applied load depends totally on the deformation of whole member rather than that of particular section itself. Moreover, the stress variation in the external tendons also depends_on the extent of fixation of the external tendons at deviators, ., it depends on the fricd~nal resistance that exists .
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