基于能量转化原理的地铁板式轨道自密实混凝土本构行为

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摘要为了掌握地铁板式轨道充填层自密实混凝土（SCC）在车辆荷载作用下的本构行为，通过对SCC进行单轴抗压试验，研究了不同应变率、橡胶掺量和尺寸对力学性能和能量演化规律的影响，建立了SCC的本构模型。结果表明：峰值应力的应变率敏感系数绝对值最大，弹性模量次之，峰值应变最小；橡胶延缓了能量的早期增长，而在峰值应力之后，橡胶则阻碍了弹性应变能的耗散，延长了总应变能和耗散能的快速增长；应变率越大，总应变能和耗散能增长越快，弹性应变能在峰值应力前的积累速率越快，峰值应力后的释放速率越快；建立的本构模型可以用于描述SCC在不同应变率条件下的应力-应变关系。

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	陈俊豪
	曾晓辉
	谢友均
	龙广成
	唐卓

关键词 ：板式轨道, 自密实混凝土, 应变率, 力学性能, 能量演化, 本构模型

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.

Key words： Slab track Self-compacting concrete Strain rate Mechanical properties Energy evolution Constitutive model

收稿日期: 2022-12-06 出版日期: 2024-02-28

引用本文:

陈俊豪，曾晓辉，谢友均，龙广成，唐卓. 基于能量转化原理的地铁板式轨道自密实混凝土本构行为[J]. 振动与冲击, 2024, 43(4): 190-198.
CHEN Junhao,ZENG Xiaohui,XIE Youjun,LONG Guangcheng,TANG Zhuo. Constitutive response of subway slab track self-compacting concrete based on theenergy conversion principle. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(4): 190-198.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2024/V43/I4/190

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