Abstract
Push plate test is a powerful tool to evaluate the interfacial bond performance of China railway track structure type‐II slab ballastless track structure (CRTS II SBTS). However, there is still a lack of theoretical explanation of the push plate test. In this paper, a linear proportional distribution method is proposed in terms of a series of analytical formulas to describe the interfacial force‐displacement variation of CRTS II SBTS in different damage stages of the horizontal push plate test. The force‐displacement relationship established by the linear proportional distribution method agrees well with that observed in full‐scale test. The horizontal push plate test is then simulated, in which a bilinear cohesive zone model (CZM) was adopted to simulate the interface within track structure. The parameters of the CZM are calculated based on the force‐displacement curves obtained from scale push plate test. Particularly, the normal cohesive parameters are determined based on the scale vertical push plate test instead of the traditional splitting tensile test. The simulation proves that both the maximum affected length in the undamage stage and the maximum damaged length in the damage stage depend rather on the interfacial stiffness and the material parameters of SBTS than the horizontal load. These two lengths given by the simulation are close to those defined by the proposed linear proportional distribution method. This indicates the reliability of the proposed method and the capability of scale push plate test in determining cohesive parameters.
Highlights
China railway track structure type-II slab ballastless track structure (CRTS II SBTS) is widely used for high-speed railway (HSR) of China because it can provide high rail smoothness and ensure high comfort, stability, and safety of high-speed train
The push plate test of CRTS II SBTS is investigated by theoretical analysis, experiments, and numerical simulation
A bilinear cohesive zone model (CZM) is adopted to simulate the interface within CRTS II SBTS. e parameters of the CZM are determined by scale push plate test
Summary
China railway track structure type-II slab ballastless track structure (CRTS II SBTS) is widely used for high-speed railway (HSR) of China because it can provide high rail smoothness and ensure high comfort, stability, and safety of high-speed train. A theoretical solution of the interfacial force-displacement relationship would help to validate whether the commonly used CZM and the cohesive parameters obtained from push plate test are reliable for the use of FEA. E normal cohesive parameter determined in this way has large randomness because it strongly depends on the bond behavior of the CA mortar of the selected local area It cannot represent the overall bond behavior of the entire interface and the real changing of the force-displacement variation. To make the FEA of the interfacial damage evolution closer to reality, a real normal force-displacement relationship is required to calculate realistic normal cohesive parameters, which strongly suggests the need to carry out vertical push plate test. E scope of this work is to explore the force-displacement variation during the push plate test, determine the parameters that better describe the interfacial bond behaviour of CRTS II SBTS than the single index of interfacial bond strength, and clarify whether the interfacial parameters obtained from the scale push plate test can be used in the FEA of the full-scale push plate test
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