- 摘 要
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(1 北京建筑大學土木與交通工程學院, 北京 100044; 2 北京建筑大學大型多功能振動臺陣實驗室,北京 100044; 3 北京建筑大學建筑結(jié)構(gòu)與環(huán)境修復功能材料北京市重點實驗室, 北京 100044;4 東南大學土木工程學院, 南京 210096)
摘要: 為了探討影響尼龍織物增強板式橡膠支座力學性能的主要因素,設(shè)計加工了三種橡膠總厚度相同、尼龍織物加強層層數(shù)不同的板式橡膠支座,對其進行了豎向壓縮試驗與水平剪切試驗. 試驗結(jié)果表明:該類支座力學性能穩(wěn)定,在 10MPa 壓應力下未出現(xiàn)肉眼可見的損傷. 各支座隨設(shè)計壓應力從 5MPa 增加至 10MPa,豎向壓縮剛度上升近 80%,隨尼龍織物加強層層數(shù)增加小幅降低;豎向等效阻尼比隨設(shè)計壓應力增大而減小約 17%,受尼龍織物加強層層數(shù)影響不大. 5MPa 壓應力作用下,支座剪切滯回曲線平滑且飽滿,最大剪應變達到 300%時支座工作性能仍保持良好. 隨著剪應變增加,支座先后出現(xiàn)卷曲、翻滾等變形形態(tài),支座水平剪切剛度也因此表現(xiàn)出先減小后增大的趨勢. 因為尼龍織物受剪變形,尼龍織物層數(shù)越多支座的水平剪切剛度減小. 各支座的水平等效阻尼比均在 9% ~ 13%之間,織物層數(shù)對其略有影響.
關(guān)鍵詞: 尼龍織物; 橡膠支座; 滯回曲線; 支座剛度; 等效阻尼比
中圖分類號:TU352. 1+2 文獻標志碼:A 文章編號: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
∗國家自然科學基金項目(51908024),北京建筑大學建大英才項目(JDYC20200310).
第一作者:吳宜峰,博士,副教授,主要從事結(jié)構(gòu)減隔震與振動控制研究,Email: wuyifeng@ bucea. edu. cn.
[引用本文] 吳宜峰,徐宇伯,司明非,等. 尼龍織物增強橡膠支座力學性能試驗研究[ J]. 建筑結(jié)構(gòu),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.
