Damping characteristics of filling layer self-compacting concrete applied in a slab track system

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (14) : 211-219.

CHEN Junhao1,XIE Youjun1,ZENG Xiaohui1,LIU Jinhui2,GUO Taoming2,GUAN Jibo3,LONG Guangcheng1

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Abstract

Damping properties have an important influence on the dynamic behavior of civil engineering structures. However, there has been no research on the damping performance of filling layer self-compacting concrete (SCC) of subway slab track. In this paper, the MTS test system was used to study the influence law and variation mechanism of different stress amplitude, rubber content and size on the hysteretic energy and loss factor of SCC, and the hysteretic energy of SCC was numerically simulated. The results showed that the hysteretic energy of SCC increased first slowly and then rapidly with the increase of stress amplitude, which was closely related to its damage evolution and dynamic elastic modulus degradation, and the energy dissipation of internal defects was the main damping mechanism of SCC; The hysteretic energy was a power function relationship with the stress amplitude, among them, the power exponent value of SCC was the smallest, indicating that the nonlinear degree of SCC was the lowest; Rubber significantly increased the damping performance of SCC. Under the same stress amplitude, the hysteresis energy of SCC increased with the increase of rubber content and the decrease of size. The Kelvin model can be used to simulate the hysteretic energy of SCC under cyclic loading, and the theoretical value was in good agreement with the experimental value.

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damping / filling layer / self-compacting concrete (SCC) / hysteretic energy / Kelvin model

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CHEN Junhao1,XIE Youjun1,ZENG Xiaohui1,LIU Jinhui2,GUO Taoming2,GUAN Jibo3,LONG Guangcheng1. Damping characteristics of filling layer self-compacting concrete applied in a slab track system[J]. Journal of Vibration and Shock, 2023, 42(14): 211-219

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