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Study on Mechanical Behavior of Eccentrically Loaded GFRP Tubed Short Reinforced Concrete Columns

Author: RuanBingFeng
Tutor: WangQingXiang
School: Dalian University of Technology
Course: Structural Engineering
Keywords: GFRP tubed short columns Eccentric compression Bearing capacity Load-deflection curves Full-procedure analysis
CLC: TU398.9
Type: Master's thesis
Year: 2009
Downloads: 131
Quote: 7
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Abstract


Concrete-filled FRP tubes have many advantages,including that the FRP tubes not only can protect steel and concrete from corrosive environment,but also can be used as the core concrete’s vertical and horizontal reinforced materials to raise the bearing capacity of the components.FRP tubes can provide a permanent formwork for the concrete,as a result,the cost of formwork is saved and the speed of construction is picked up.Concrete-filled FRP tubes can meet the needs of modern engineering structures’ development toward long-span, high rise,heavy load,high strength and light weight,as well as the need of bearing the mal-condition,in line with the industrial requirements of modern construction.Wide concen has been focused on since CFFT was initially recognized by the scholars at home and abroad,which has become one of the most popular item on new style composite structures. The results corresponding has been drawn a lot,however,studies on FRP tubed reinforced concrete columns have been very limited(The FRP tubes are used to transversly confine concrete,not bearing the axial loads directly).Based on experimental and theoretical analysis,the mechanical behavior of the GFRP tubed short reinforced concrete columns under eccentric load are researched.Completed the following work:(1) Tests of GFRP tubed short reinforced concrete columns under axial load,as well as under eccentric load,are carried out to investigate the working feature,failure modes and the effect of GFRP tube confining.The principal influencing factors such as ratio of longitudinal reinforcement,concrete strength,loading condition and eccentricity are researched.The loaddeflection curves and stress-strain curves of the GFRP tubed short reinforced concrete columns under eccentric load are studied.The assumptions such as the plane-section and the rod-axis’ deflection curve is same as sinusoidal half-wave curve are verified to be feasible by the test results.(2) The numerical computational formula and simplified computational formula for calculating the bearing capacity of the GFRP tubed short reinforced concrete columns under eccentric load are proposed according to the test results.The corresponding procedures are prepared and the calculated results can compare well with the experimental results.The formulas can be used to calculate the bearing capacity of GFRP tubes confined common concrete,as well as GFRP tubes confined high strength concrete,and the bearing capacity of short columns with reinforcement and stirrups.(3) The full-procedure analysis of GFRP tubed short reinforced concrete columns under eccentric load is carried out and the axial force-bending moment-curvature curves are abtained through the corresponding procedures.The comparative analysis of N_u-M_u curves of GFRP tubed short reinforced concrete columns and the short reinforced concrete columns under eccentric load is focused on.Finally,the method of full-procedure analysis of GFRP tubed short reinforced concrete columns under eccentric load is suggested on the basis of existing theoretical research.

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