In situ concrete stitching with subsequent prestressing is often used in construction to join together precast concrete segments. An example of an application is the stitching of the approaching decks of precast segmental bridges constructed using the balanced cantilever method. The relatively narrow stitches used in segmental bridges are often provided with nominal reinforcement only. Therefore, the in situ stitch is a location of potential weakness, but relatively little work has been done in this area. In light of this, extensive experimental and numerical studies on the behaviour of precast concrete members with in situ concrete stitches have been conducted. The effects of stitch width, prestressing force, concrete strength, bonding of tendon and provision of shear keys on the performance of such members are presented in this paper. Unlike members that are continuously cast, cracking initiates along the construction joint between the precast segment and the stitch at low load levels for members with in situ stitches, while no cracking is observed elsewhere. The cracks widen extensively as the load level increases and can become detrimental to the serviceability of the members. Such members should be designed so that the joints are subject to no tension under service load. Notation G c pre-crack shear modulus G c,cr post-crack shear modulus q bond stress u slip of tendon β shear retention factor

No abstract

No abstract

Most of the existing codes of practice allow moment redistribution to be applied to reinforced concrete design with upper limits of 20-30%. It is, however, questionable whether the same limits are valid for the design of prestressed Engineering and Computational Mechanics Volume 166 Issue EM1 Non-linear analysis and moment redistribution of prestressed concrete members Leung, Au and Kwan Engineering and Computational Mechanics Volume 166 Issue EM1 Non-linear analysis and moment redistribution of prestressed concrete members Leung, Au and Kwan Engineering and Computational Mechanics Volume 166 Issue EM1 Non-linear analysis and moment redistribution of prestressed concrete members Leung, Au and Kwan Engineering and Computational Mechanics Volume 166 Issue EM1 Non-linear analysis and moment redistribution of prestressed concrete members Leung, Au and Kwan Engineering and Computational Mechanics Volume 166 Issue EM1 Non-linear analysis and moment redistribution of prestressed concrete members Leung, Au and Kwan