| The corrugated steel plate refers to a steel plate that has been made into a trapezoidal,sinusoidal,or zigzag shape by cold pressing or hot rolling of a flat steel plate.The corrugated steel plate concrete structure refers to a composite structure in which corrugated steel plates are arranged in concrete and configured with certain structural ribs.Concrete makes the in-plane and out-of-plane deformation of the corrugated steel plate constrained,while the corrugated steel plate meshes with the concrete as the teeth and the teeth are fixed to each other,both of which can fully exert the advantages of the combined structure.However,the theoretical basis for the safe and cooperative operation of the composite structure is the bonding performance between its constituent material interfaces.In this paper,the traditional factors that affect the bond slip,such as the strength grade of concrete,the thickness of the concrete cover,the length of corrugated steel plate embedded and the ratio of stirrups,are considered comprehensively,and the influence of the cross-sectional geometry of the corrugated steel plate on the bond slip is studied.Considering the two factors of wave angle and trough length,eight corrugated steel plate concrete launch specimens were designed.By affixing strain gauges on the surface of the corrugated steel plate and arranging the built-in electronic slip sensors,the distribution of the stress and slip of the corrugated steel plates was studied.The following research results have been achieved through the experiment.(1)By analyzing the bond strength of each test piece,the optimum wave form fora corrugated steel plate concrete structure subjected to push-out load is a deep wave with a wave angle of 120°.(2)By analyzing the failure mechanism of specimens,the formulas for calculating the characteristic bond strength of corrugated steel plate concrete under different loading stages were proposed,and the distribution law of bond stress at different anchoring depths of corrugated steel plates was analyzed in depth.(3)Based on the test statistical values of the characteristic bond stress and the characteristic slip,the reference bond slip constitutive relation of the average bond stress-load end slip is established.(4)Based on the distribution law of bond stress along the anchorage depth,a bond-slip constitutive relation considering the position function was proposed.(5)Based on ANSYS finite element software,the specimens were numerically simulated from the bond-slip constitutive relation and the bond-slip constitutive relation considering the position function.The results exhibit that the bond-slip constitutive relation considering the position function has more accuracy.(6)According to the theory of elastic mechanics,the theoretical formulae for the bond stress and slip of corrugated steel plate concrete are established,and the theoretical solution is compared with the experimental solution.It is found that the two are highly consistent. |
