Hybrid FRP-concrete-steel double-skin tubular columns under axial cyclic compression

Pao Yue-kong Library Electronic Theses Database

Hybrid FRP-concrete-steel double-skin tubular columns under axial cyclic compression


Author: Cao, Yubo
Title: Hybrid FRP-concrete-steel double-skin tubular columns under axial cyclic compression
Degree: M.Sc.
Year: 2009
Subject: Hong Kong Polytechnic University -- Dissertations.
Columns, Iron and steel.
Fiber reinforced plastics.
Fiber-reinforced concrete.
Department: Dept. of Civil and Structural Engineering
Pages: xvi, 100 leaves : ill. ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2329742
URI: http://theses.lib.polyu.edu.hk/handle/200/3684
Abstract: Hybrid FRP-concrete-steel double-skin tubular column (DSTC) is a new form of hybrid column, which consists of an outer tube made of fibre reinforced polymer (FRP) and an inner steel tube, filled with concrete in between. In previous research, it has been proved that the three constituent materials are optimally combined to achieve several expected advantages not available with existing columns. Promising applications are realized for its ductile response under load. Early research gives us a reasonable design-oriented stress-strain model for confined concrete in hybrid DSTCs and some design recommendations on the basis of extensive parameter study. This model has been employed to predict the monotonic stress-strain history. The behaviour of confined concrete in DSTCs during a cyclic compression test is what we expected to study in this thesis; two major parts are investigated: experimental research and model development. In the stage of experimental research, the thesis gives us a clear description on preparation of DSTC specimens and relevant material tests. Both monotonic and cyclic compression tests are conducted, the behaviour of hybrid DSTCs under cyclic axial compression, full unloading/reloading especially, are carefully observed and discussed. A series of partial unloading/reloading compression tests are then conducted to examine the effect of loading history. A proposed analytical model originated from a combination of existing models is introduced. The capability and accuracy of the proposed model in predicting the whole stress-strain history of DSTC under cyclic axial compression are demonstrated through comparisons between predictions by the proposed model and test results. This new hybrid DSTC has been proved to be a promising structural member in a real construction; therefore, cyclic behaviour of the member will enrich the consideration in design of a practical hybrid DSTCs. Further research, recommended in the thesis, will definitely facilitate reasonable design in a real structure.

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