Finite element analysis and bearing capacity calculation of T-shaped joints of corroded steel pipes repaired by grout-filled GFRP tube
To study the compressive behavior of corroded circular hollow section T-joints repaired by grout-filled GFRP tube(GFGT),finite element models of GFGT repaired corroded joints were established verified,and further employed to investigate the influences of joint geometry,repairing methods and chord end stress ratio on the compressive strength and repairing efficiency.The results demonstrate that the GFGT has higher repairing efficiency with higher thickness of GFRP tube,lower repaired chord section hollow ratio,higher strength of grouting material and longer repair range.Repaired by GFGT,the compressive strength of corroded joints with 30％corrosion rate can be increased to 138％,147％and 156％of the uncorroded counterpart when brace-to-chord diameter ratio is 0.4,0.6 and 0.8,respectively.The chord end stress has a similar but weaker effect on the repaired joints than on the unrepaired joints.The compressive strength degradation rate of corroded joints is precisely predicted by the design methods of CIDECT and prEN 1993-1-8:2021.The feasibility of the standard formula for evaluating the reduction rate of compressive strength caused by the chord end stress is verified.Design methods for predicting the compressive strength of GFGT repaired corroded joints were proposed,which can be used to evaluate the compressive strength of repaired joints with corrosion degree no more than 30％.
circular hollow section jointGFRP tubecorrosiongrout filledfinite element analysisbearing capacity calculation
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