Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/74136
Title: Direct method for strengthening continuous RC beams with external tendons
Authors: Tan, K.H. 
Kong, D.
Keywords: Collapse mechanism
Continuous beam
Equivalent loads
External tendons
Load-carrying capacity
Issue Date: 2010
Source: Tan, K.H.,Kong, D. (2010). Direct method for strengthening continuous RC beams with external tendons. American Concrete Institute, ACI Special Publication (272 SP) : 45-68. ScholarBank@NUS Repository.
Abstract: This paper presents a simple direct method to determine the external tendon configuration required for a desired increase in load-carrying capacity of continuous beams. The tendon layout is selected based on the concept of equivalent loads, but need not be concordant. By considering the collapse mechanism of the beam, the increase in load-carrying capacity can be related directly to the tendon force. It is shown that the increase in load-carrying capacity is partly due to an increase in the force in the compression zone arising from the horizontal component of the prestressing force, and partly due to the upward components of the prestressing force. The method was verified with a test program on six two-span continuous beams, in which the tendon profile and loading pattern were varied. Comparison of the test results and those available in the literature showed that the proposed method gives a reasonably conservative design. A simplified method based on the direct balancing of increased loads is also proposed.
Source Title: American Concrete Institute, ACI Special Publication
URI: http://scholarbank.nus.edu.sg/handle/10635/74136
ISBN: 9780870313905
ISSN: 01932527
Appears in Collections:Staff Publications

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