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• W2564311507 abstract "While the technology of post-tensioning has been widely used and well developed inconcrete structures, it has also been applied to other structures, such as timber frameconstruction. In addition, post-tensioning, along with other strengthening techniques suchas retrofitting and carbon fibre reinforced polymers (CFRP), has been used to strengthenand upgrade existing steel structures using similar materials and setup as in post-tensionedconcrete beams. However the technology required for prestressed members can be veryexpensive and not widely available in many developing countries, or even in remote areas ofdeveloped countries such as Australia, and, if specified, may prove to be uneconomical if forexample personnel and equipment have to be imported or relocated. The objective of thisthesis is therefore to introduce and investigate local post-tensioning (LPT) as a simple andlow-cost alternative to modern high-tech post-tensioning techniques. LPT uses conventionalreinforcing bars and a manual screw jack (in the case of concrete or steel members) orbracing straps and bracing tensioners (in the case of timber members), instead of tendonsand hydraulic jacks, to apply post-tensioning to the new or existing structure. This researchinvestigated LPT reinforced concrete, timber and steel beams, resulting in the followingfindings:•Four large-scale concrete beams were locally post-tensioned and tested. Theoretical predictions were made based on AS 3600-2009 and a new theoretical approach was proposed to determine the cracking moment of tested beams, since the current design guide was not applicable to this post-tensioning method.•LPT timber panels were investigated as an application to new structures. Six identicalpanels made of butt jointed and nailed timber beams were post-tensioned and tested under four-point bending. These were compared with equivalent panels made from continuous unjointed beams. In addition, the dynamic behaviour of these panels was experimentally investigated. Results showed that the post-tensioning created hogging deflections and decreased the overall serviceability deflections by almost half of their values; moreover, LPT affected the dynamic behaviour of these panels, in particular the damping ratio, which significantly decreased but remained within the acceptable limits.•The effectiveness of LPT to enhance the repair of damaged steel beams was studied. Six repaired beams with different bar diameters and levels of pre-stress were tested under three-points bending. The level of post-tensioning controlled the beams’ stiffness, while restoration of their ultimate load-carrying capacity was governed by the bar size. Significantly higher repaired capacities were achieved by this method than by other published methods used for the strengthening of steel beams.•Upgrading of intact steel beams using LPT was also investigated. In total, seven beams were upgraded and tested under three-point bending, using different configurations of reinforcing steel. The level of post-tensioning, the type of LPT (internal or external) and the diameter of reinforcing bars used significantly affected the beams’ stiffness and their ultimate load-carrying capacity. The results obtained in this study compared favourably with those of other methods used for upgrading steel beams." @default.
• W2564311507 created "2017-01-06" @default.
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• W2564311507 date "2016-01-01" @default.
• W2564311507 modified "2023-09-27" @default.
• W2564311507 title "Application of local post-tensioning to new and existing structures" @default.
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