LYP225低屈服点钢哑铃形钢棒阻尼器剪切性能试验研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (15) : 209-217.

论文

连鸣1,2,周玉浩1,苏明周1,2,李伟1

作者信息 +

Test study on shear performance of LYP225 low yield point steel dumbbell shaped steel rod damper

LIAN Ming1,2, ZHOU Yuhao1, SU Mingzhou1,2, LI Wei1

Author information +

文章历史 +

摘要

本文结合带平直段的双圆锥阻尼器和低屈服点钢材的特性，设计了LYP225低屈服点钢哑铃形钢棒阻尼器（LY225-WDP），该阻尼器具有屈服位移小、延性高、耗能能力稳定的特点。利用低屈服点钢LYP225设计了7个不同构造参数的LY225-WDP试件，并对其进行低周往复循环荷载试验，研究阻尼器在循环剪切变形下的滞回与耗能能力，以及不同设计参数对阻尼器力学性能的影响。结果表明，在循环剪切变形下，LY225-WDP的变形特点主要表现为弯曲变形，破坏模式属于低周疲劳破坏；阻尼器的滞回曲线饱满，稳定性良好，在整个加载过程中，表现出明显的强化现象，延性系数在8.5~10.04，超强系数在2.09~2.79；阻尼器的弹性刚度及承载力在耗能段内径及长度一定时与内缩率呈正相关，在耗能段外径及长度一定时与内缩率呈负相关；阻尼器的耗能能力随着平直段长度的增加而明显提升；对LY225-WDP建立了弹性刚度及屈服承载力计算公式，试验数据验证了公式的准确性，可为LY225-WDP的设计提供参考。

Abstract

This paper combines the characteristics of the double cone damper and low yield point steel to propose the LY225-WDP (LYP225 low yield point steel web dumbbell pin damper). This damper exhibits features such as minimal yield displacement, high ductility, and stable energy dissipation capacity. Utilizing the low yield point steel LYP225, seven LY225-WDP specimens with varying structural parameters were designed. These specimens underwent low-cycle reciprocating cyclic loading tests to investigate the damper's hysteresis behavior under cyclic shear deformation, as well as the impact of different design parameters on the damper's mechanical performance. The results indicate that under cyclic shear deformation, LY225-WDP primarily exhibits bending deformation, leading to a failure mode associated with low-cycle fatigue. The damper's hysteresis curve is robust and stable, with a noticeable strengthening phenomenon throughout the loading process. Notably, the ductility coefficient ranges from 8.5 to 10.04, and the overstrength coefficient varies between 2.09 and 2.79. The damper's elastic stiffness and load-bearing capacity demonstrate positive correlations with the internal shrinkage rate when the energy dissipation section's inner diameter and length remain constant. Conversely, for a constant outer diameter and length of the energy dissipation section, these parameters display a negative correlation with the internal shrinkage rate. Moreover, the damper's energy dissipation capacity notably improves with an increase in the length of the straight section. The calculation formulas of elastic stiffness and yield bearing capacity of LY225-WDP are established. The accuracy of the formulas is verified by the experimental data, which can provide reference for the design of LY225-WDP.

导出引用

连鸣1,2,周玉浩1,苏明周1,2,李伟1. LYP225低屈服点钢哑铃形钢棒阻尼器剪切性能试验研究[J]. 振动与冲击, 2024, 43(15): 209-217

LIAN Ming1,2, ZHOU Yuhao1, SU Mingzhou1,2, LI Wei1. Test study on shear performance of LYP225 low yield point steel dumbbell shaped steel rod damper[J]. Journal of Vibration and Shock, 2024, 43(15): 209-217

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