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Longitudinal Stress Distributions around Construction Joints of PSC Bridge Girders  

Im, Jung-Soon (경기대학교 토목.환경 공학부)
Lee, Soo-Keun (경기대학교 토목공학과)
Chae, Sung-Tae (하이콘엔지니어링 구조부)
Publication Information
Journal of the Korean Society of Hazard Mitigation / v.2, no.3, 2002 , pp. 101-108 More about this Journal
Abstract
There exist many construction joints in segmentally constructed bridge girders. It is required coupling of tendons or overlapping of tendons to introduce continuous prestress through several spans of bridges. Even though tendon coupling method is easier to use in practice, some cracking problems around construction joints have been reported and complicated stress states around construction joints in PSC girders is not clearly investigated. The purpose of this paper is to investigate in detail the complicated longitudinal stress distributions around the construction joints in prestressed concrete girders with tendon couplers. To this end, a comprehensive experimental program has been set up and a series of specimens have been tested to identify the effects of tendon coupling and segmental construction of bridge sections. The present study indicates that the longitudinal stress distributions of PSC girders with tendon couplers are quite different from those of PSC girders without tendon couplers. The longitudinal compressive stresses introduced by prestressing are greatly reduced around coupled joints according to tendon coupling ratios.
Keywords
construction joint; prestressed concrete bridge; tendon coupler;
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