Study on flexural bearing capacity of secant pipe roofing members in underground engineering
Based on a flexural testing of the secant pipe roofing specimen(SPRS),the mechanical property and failure mode of the SPRS specimen were investigated.In order to further study the effect of key structural parameters on flexural behavior of SPRS specimen,the finite element models(FEMs)of SPRS specimen were established using ABAQUS,and the accuracy of the models was verified according to the laboratory experiments.Subsequently,the influences of the overlapping distance between the adjacent tubes,the thickness of the tube and the diameter of the steel bar on the flexural behavior of SPRS were studied.The results indicate that the SPRS specimen has a good flexural behavior and eventually occurs ductile failure.The overlapping distance between the adjacent tubes and the thickness of the tube have a significantly effect on flexural bearing capacity of specimen,and the effect of the diameter of the steel bar on the flexural bearing capacity of specimen is not significant.Finally,the relationship between the overlapping distance between the adjacent tubes,the thickness of the tube and the diameter of the steel bar and flexural bearing capacity were presented.The simplified calculation formula of the flexural bearing capacity of the SPRS specimen was proposed based on multiple linear regression.
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