Efficiency evaluation of analyzing post-tensioned transfer girder simultaneously with reinforced concrete frame
In reality, post-tension prestressed (PT) girders are usually analysed separately from other surrounding structural elements due to the limits of the existing structural software packages. This paper introduces a numerical analysis on a reinforced concrete (RC) frame including a transfer PT girder using ADAPT-Edge (3D) software. As the software is capable of analyzing PT girders together with other RC beams and columns in the frame, the effects of the arrangement and number of prestressed cables on the internal forces distribution, strength, stiffness and deformation of the transfer PT girder as well as of the whole frame can be clarified. In this paper, three PT design options to the Eurocodes are proposed in a worked example on a three-dimensional frame having seven storeys and a 15m-span transfer PT girder on the second floor to investigate the effects of the overall analysis. The analysis results show that the solution of having only PT for the transfer girder is more reasonable in PT materials usage, whereas all the design criterion on strength and serviceability can still be satisfied. However, due to the detailing requirement of anchorage ends, the solution of distributing prestressed cables not only in the transfer girder but also in other girders on the above floors can also be applied efficiently.
Keywords: transfer girder; prestressed; frame; reinforced concrete; ADAPT software.
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