Calculation model and experimental verification of bearing capacity for prestressed concrete cylinder pipe under three-edge bearing test
The calculation of bearing capacity for prestressed concrete cylinder pipe(PCCP)involves the redistri-bution of bending moment when the core cracks,which is an important component in the design of pipe structures.To address the empirical nature of core cracking determination in existing calculation methods and the severity of pipe deformation after core cracking in existing experimental results,a PCCP bearing capacity calculation model under three-edge bearing test is proposed.The model derives the bending moment and thrust coefficients of the pipe wall section based on a rigid pipe assumption and uses the simplified stress-strain relationship of concrete as a criterion for determining core cracking.After core cracking,mathematical expressions for the redistribution of ben-ding moment at the springline and the movement of the action line of thrust at the invert(crown)are given.A three-edge bearing test based on distributed optical fiber sensors were conducted to verify the rationality of the calculation method.Comparative verification results show that calculated results are consistent with experimental results before core cracking,while they have similar trends after core cracking.The comparative analysis framework between the calculation model and prototype experiment helps deepen our understanding of PCCP deformation laws under exter-nal loads and will be useful in determining and optimizing pipe design parameters in future applications.
PCCPcalculation modelthree-edge bearing testdistributed optical fiber sensorsoptimization of design parameters
万方数据
维普
