尼龙织物增强橡胶支座力学性能试验研究
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；
尊敬的用户，本篇文章需要2元，点击支付交费后阅读
限时优惠福利：领取VIP会员
全年期刊、VIP视频免费!
全年期刊、VIP视频免费!
参考文献[1] 胡聿贤.地震工程学[M].北京：地震出版社，2006.
[2] KELLY J M.Analysis of fiber-reinforced elastomeric isolators[J].Journal of Seismology and Earthquake Engineering,1999,2(1):19-34.
[3] MOON B Y.Design and manufacturing of fiber reinforced elastomeric isolator for seismic isolation[J].Journal of Materials Processing Technology,2002,130:145-150.
[4] TOOPCHI-NEZHAD H.Bonded versus unbonded strip fiber reinforced elastomeric isolators:finite element analysis[J].Composite Structures,2011,93(2):850-859.
[5] TOOPCHI-NEZHAD H,DRYSDALE R G,TAIT M J.Parametric study on the response of stable unbonded-fiber reinforced elastomeric isolators (SU-FREIs)[J].Journal of Composite Materials,2009,43(15):1569-1587.
[6] AL-ANANY Y M.A numerical study on the compressive and rotational behavior of fiber reinforced elastomeric isolators (FREI)[J].Composite Structures,2015,133:1249-1266.
[7] ASHKEZARI G D.Design,manufacturing and evaluation of the performance of steel like fiber reinforced elastomeric seismic isolators[J].Journal of Materials Processing Technology,2008,197(1/2/3):140-150.
[8] HEDAYATI DEZFULI F,ALAM M S.Performance of carbon fiber-reinforced elastomeric isolators manufactured in a simplified process:experimental investigations[J].Structural Control and Health Monitoring,2014,21(11):1347-1359.
[9] HEDAYATI DEZFULI F,ALAM M.Experiment-based sensitivity analysis of scaled carbon-fiber-reinforced elastomeric isolators in bonded applications[J].Fibers,2016,4(1):4.
[10] THUYET V N,DEB S K,DUTTA A.Mitigation of seismic vulnerability of prototype low-rise masonry building using U-FREIs[J].Journal of Performance of Constructed Facilities,2018,32(2):04017136.
[11] 谭平，徐凯，王斌，等.基于新型简易隔震支座的村镇建筑隔震性能研究[J].土木工程学报，2013,46(5):64-70.
[12] 谭平，王斌，金建敏，等.纤维增强工程塑料板夹层橡胶隔震支座有限元分析[J].振动与冲击，2014,33(24):95-100.
[13] WU Y F,ZHANG Y,LI A Q,et al.The experimental study on mechanical behavior of conveyor belt rubber bearings[J].Applied Sciences,2020,10(13):4452.
[14] 硫化橡胶或热塑性橡胶拉伸应力应变性能的测定：GB/T 528—2009[S].北京：中国标准出版社，2009.
[2] KELLY J M.Analysis of fiber-reinforced elastomeric isolators[J].Journal of Seismology and Earthquake Engineering,1999,2(1):19-34.
[3] MOON B Y.Design and manufacturing of fiber reinforced elastomeric isolator for seismic isolation[J].Journal of Materials Processing Technology,2002,130:145-150.
[4] TOOPCHI-NEZHAD H.Bonded versus unbonded strip fiber reinforced elastomeric isolators:finite element analysis[J].Composite Structures,2011,93(2):850-859.
[5] TOOPCHI-NEZHAD H,DRYSDALE R G,TAIT M J.Parametric study on the response of stable unbonded-fiber reinforced elastomeric isolators (SU-FREIs)[J].Journal of Composite Materials,2009,43(15):1569-1587.
[6] AL-ANANY Y M.A numerical study on the compressive and rotational behavior of fiber reinforced elastomeric isolators (FREI)[J].Composite Structures,2015,133:1249-1266.
[7] ASHKEZARI G D.Design,manufacturing and evaluation of the performance of steel like fiber reinforced elastomeric seismic isolators[J].Journal of Materials Processing Technology,2008,197(1/2/3):140-150.
[8] HEDAYATI DEZFULI F,ALAM M S.Performance of carbon fiber-reinforced elastomeric isolators manufactured in a simplified process:experimental investigations[J].Structural Control and Health Monitoring,2014,21(11):1347-1359.
[9] HEDAYATI DEZFULI F,ALAM M.Experiment-based sensitivity analysis of scaled carbon-fiber-reinforced elastomeric isolators in bonded applications[J].Fibers,2016,4(1):4.
[10] THUYET V N,DEB S K,DUTTA A.Mitigation of seismic vulnerability of prototype low-rise masonry building using U-FREIs[J].Journal of Performance of Constructed Facilities,2018,32(2):04017136.
[11] 谭平，徐凯，王斌，等.基于新型简易隔震支座的村镇建筑隔震性能研究[J].土木工程学报，2013,46(5):64-70.
[12] 谭平，王斌，金建敏，等.纤维增强工程塑料板夹层橡胶隔震支座有限元分析[J].振动与冲击，2014,33(24):95-100.
[13] WU Y F,ZHANG Y,LI A Q,et al.The experimental study on mechanical behavior of conveyor belt rubber bearings[J].Applied Sciences,2020,10(13):4452.
[14] 硫化橡胶或热塑性橡胶拉伸应力应变性能的测定：GB/T 528—2009[S].北京：中国标准出版社，2009.
Experimental research on mechanical properties of nylon fabric reinforced rubber bearings
Abstract: In order to explore the main factors affecting the mechanical properties of nylon fabric reinforced plate rubber bearings, three plate rubber bearings with the same total rubber thickness and different nylon fabric reinforcement layers were 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 was seen under 10MPa pressure. The vertical compressive stiffness of each bearing increases by nearly 80% with the design compressive stress increasing from 5MPa to 10MPa, and decreases with the increase of the number of nylon fabric reinforcement layers; The vertical equivalent damping ratio decreases about 17% with the design compressive stress increasing, and is not greatly affected by the number of nylon fabric reinforcement layers. The shear hysteresis curve of the bearing under 5MPa compressive stress is smooth and plump, and the bearing remains well when the maximum shear strain reaches 300%. With the increase of shear strain, the bearing appeared successively deformed forms such as curling and tumbling, the horizontal shear stiffness of the bearing also showed a trend of first decreasing and then increasing. Because the nylon fabric is deformed by shear, the horizontal shear stiffness of the bearings decreases with the increase of nylon fabric layers. The horizontal equivalent damping ratio varies in the range between 9%～13%, and the number of fabric layers affects slightly.
Keywords: nylon fabric; rubber bearing; hysteresis curve; bearing stiffness; equivalent damping ratio
840
0
0