doi:10.3850/978-981-08-9247-0_rp072-icsas11

ABSTRACT

An investigation on the strengthening effects of external post-tensioning on a steel truss bridge is presented in this paper. Straight and draped tendon profiles were used in this theoretical study and the draped tendon profile was identified as a more effective tendon profile. The optimum prestressing force which led to maximum truss strengthening was also determined, that is, in a range of 0.4 to 0.6 times the support reactions. The results are presented and interpreted using maximum joint displacement and member stress to critical stress ratio. The proposed method is advantageous in strengthening the steel truss in terms of maximum joint displacement control and truss member stress relief; thus leading to improved load-carrying capacity.

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