Constitutive response of subway slab track self-compacting concrete based on theenergy conversion principle

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (4) : 190-198.

CHEN Junhao,ZENG Xiaohui,XIE Youjun,LONG Guangcheng,TANG Zhuo

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Abstract

In order to better understand the constitutive response of self-compacting concrete (SCC) applied in subway slab track filling layer under vehicle loads, the uniaxial compression test of SCC was carried out. The effects of different strain rates, rubber content and size on the stress-strain relationship and the energy evolution law of SCC were investigated, and a constitutive model was established. The results showed that the absolute value of the strain rate sensitivity coefficient of the peak stress was the largest, followed by the elastic modulus, and the peak compressive strain was the smallest. Because of rubber, the early energy growth of SCC was delayed, while after peak stress, the dissipation of elastic strain energy was hindered, and the rapid growth of total strain energy and dissipated energy were prolonged. The greater the strain rate, the greater the increase rate of total strain energy and dissipated energy, the greater the accumulation rate of elastic strain energy before the peak stress, and the greater the release rate after the peak stress. The established constitutive model can be used to describe the stress-strain relationship of SCC under different strain rate conditions.

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Slab track / Self-compacting concrete / Strain rate / Mechanical properties / Energy evolution / Constitutive model

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CHEN Junhao,ZENG Xiaohui,XIE Youjun,LONG Guangcheng,TANG Zhuo. Constitutive response of subway slab track self-compacting concrete based on theenergy conversion principle[J]. Journal of Vibration and Shock, 2024, 43(4): 190-198

References

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