板式轨道充填层自密实混凝土阻尼性能研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (14) : 211-219.

论文

板式轨道充填层自密实混凝土阻尼性能研究

陈俊豪1，谢友均1，曾晓辉1，刘锦辉2，郭桃明2，管吉波3，龙广成1

作者信息 +

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

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

Author information +

文章历史 +

摘要

阻尼性能对土木工程结构的动力行为有重要影响，目前尚未见针对地铁板式轨道填充层自密实混凝土（self-compacting concrete ，SCC）阻尼性能的研究。本文采用MTS疲劳试验机，研究了不同应力幅值、橡胶掺量和尺寸对SCC滞回耗能和损耗因子的影响规律及变化机理，并对SCC的滞回耗能进行数值模拟。结果表明：SCC的滞回耗能随应力幅值的增加先慢后快的增大，这与其损伤演变和动弹性模量退化密切相关，内部缺陷的能量耗散是SCC的主要阻尼机制；滞回耗能与应力幅值呈幂函数关系，其中SCC的幂指数值最小，表明SCC的非线性程度最低；橡胶显著增大了SCC的阻尼性能，在相同的应力幅值下，SCC的滞回耗能随着橡胶掺量的增加和尺寸的降低而增大；Kelvin模型可用来模拟SCC在循环荷载下的滞回耗能，计算值与试验结果吻合良好。

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.

导出引用

陈俊豪1，谢友均1，曾晓辉1，刘锦辉2，郭桃明2，管吉波3，龙广成1. 板式轨道充填层自密实混凝土阻尼性能研究[J]. 振动与冲击, 2023, 42(14): 211-219

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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