(1 北京建筑大学土木与交通工程学院, 北京 100044; 2 北京建筑大学大型多功能振动台阵实验室,北京 100044; 3 北京建筑大学建筑结构与环境修复功能材料北京市重点实验室, 北京 100044;4 东南大学土木工程学院, 南京 210096)

摘要: 为了探讨影响尼龙织物增强板式橡胶支座力学性能的主要因素,设计加工了三种橡胶总厚度相同、尼龙织物加强层层数不同的板式橡胶支座,对其进行了竖向压缩试验与水平剪切试验. 试验结果表明:该类支座力学性能稳定,在 10MPa 压应力下未出现肉眼可见的损伤. 各支座随设计压应力从 5MPa 增加至 10MPa,竖向压缩刚度上升近 80%,随尼龙织物加强层层数增加小幅降低;竖向等效阻尼比随设计压应力增大而减小约 17%,受尼龙织物加强层层数影响不大. 5MPa 压应力作用下,支座剪切滞回曲线平滑且饱满,最大剪应变达到 300%时支座工作性能仍保持良好. 随着剪应变增加,支座先后出现卷曲、翻滚等变形形态,支座水平剪切刚度也因此表现出先减小后增大的趋势. 因为尼龙织物受剪变形,尼龙织物层数越多支座的水平剪切刚度减小. 各支座的水平等效阻尼比均在 9% ~ 13%之间,织物层数对其略有影响.

关键词: 尼龙织物; 橡胶支座; 滞回曲线; 支座刚度; 等效阻尼比

中图分类号:TU352. 1+2 文献标志码:A 文章编号:1002-848X(2023)03-0010-05

DOI:10. 19701 / j. jzjg. ZJ220011

Experimental research on mechanical properties of nylon fabric reinforced rubber bearings

WU Yifeng1,2,3, XU Yubo1, SI Mingfei1, LI Aiqun1,2,3,4

(1 School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing100044, China; 2 Multi-Functional Shaking Taboratory, Beijing University of Civil Engineering and Architecture,Beijing 100044, China; 3 Beijing Key Laboratory of Functional Materials for Building Structure and EnvironmentRemediation, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;4 School of Civil Engineering, Southeast University, Nanjing 210096, China)

Abstract: In order to explore the main factors affecting the mechanical properties of nylon fabric reinforced plate rubberbearings, three plate rubber bearings with the same total rubber thickness and different nylon fabric reinforcement layerswere designed and fabricated, and the vertical compression and the compression shear test of the bearing were carried out.The test results show that the mechanical properties of this type bearings are stable, and there is no significant damage wasseen under 10MPa pressure. The vertical compressive stiffness of each bearing increases by nearly 80% with the designcompressive stress increasing from 5MPa to 10MPa, and decreases with the increase of the number of nylon fabricreinforcement layers; The vertical equivalent damping ratio decreases about 17% with the design compressive stressincreasing, and is not greatly affected by the number of nylon fabric reinforcement layers. The shear hysteresis curve of thebearing under 5MPa compressive stress is smooth and plump, and the bearing remains well when the maximum shear strainreaches 300%. With the increase of shear strain, the bearing appeared successively deformed forms such as curling andtumbling, the horizontal shear stiffness of the bearing also showed a trend of first decreasing and then increasing. Becausethe nylon fabric is deformed by shear, the horizontal shear stiffness of the bearings decreases with the increase of nylonfabric layers. The horizontal equivalent damping ratio varies in the range between 9% ~ 13%, and the number of fabriclayers affects slightly.

Keywords:nylon fabric; rubber bearing; hysteresis curve; bearing stiffness; equivalent damping ratio

∗国家自然科学基金项目(51908024),北京建筑大学建大英才项目(JDYC20200310).

第一作者:吴宜峰,博士,副教授,主要从事结构减隔震与振动控制研究,Email: wuyifeng@ bucea. edu. cn.

[引用本文] 吴宜峰,徐宇伯,司明非,等. 尼龙织物增强橡胶支座力学性能试验研究[ J]. 建筑结构,2023,53(3):10-14,20. WU Yifeng,XU Yubo,SI Mingfei,et al. Experimental research on mechanical properties of nylon fabricreinforced rubber bearings[J]. Building Structure,2023,53(3):10-14,20.