Research on flexural performance of grouting micro-steel pile

Subjects: Mechanics >> Basic Mechanics submitted time 2023-11-09 Cooperative journals: 《应用力学学报》

YIN Changjun1,2, YI Danping1, GONG Jiaxing1

Abstract： In order to explore the flexural performance of grouted micro steel pipe piles,12 specimens with different steel pipe diameters,wall thicknesses and mortar strengths were subjected to pure bending tests using orthogonal test schemes,and the ultimate flexural bearing capacity expression was proposed based on the test results.Formula,and use the finite element software ANSYS to establish a model for verification.The results show that the whole bending process of grouting micro steel pipe pile can be divided into three stages,namely:elastic stage,elastoplastic stage and strengthening stage; the sensitivity to the ultimate load of grouting micro steel pipe is steel pipe diameter > steel pipe wall thickness >mortar strength grade; the ultimate flexural bearing capacity calculated by different regulations is quite different from the test.The expression of the ultimate flexural bearing capacity of the grouted micro steel pipe pile proposed in this paper is in good agreement with the test results.The flexural bearing capacity of the steel pipe It accounts for about 78% of the total flexural bearing capacity of the grouted micro steel pipe piles,and the mortar in the pipe accounts for about 22%.The finite element simulation results show that the mortar in the pipe greatly improves the flexural performance of the micro steel pipe piles.The correctness of the expression of the flexural bearing capacity of the grouted micro-steel piles proposed is recommended to be promoted.

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