Experimental determination of friction at the interface of a sand-based, seismically isolated foundation
Experimental determination of friction at the interface of a sand-based, seismically isolated foundation
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砂基隔震地基界面摩擦力的实验测定
DOI：
10.1007/s00707-023-03802-0
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发表时间：
2023
期刊：
影响因子：
2.7
通讯作者：
Sezer Y
中科院分区：
文献类型：
--
作者：
Sezer Y
本文介绍了一个PVC-砂-PVC层的界面处的摩擦系数的实验研究的结果，该PVC层被用作低成本土工地震隔离设计用于低收入国家的一部分。PVC-砂-PVC结构由两个光滑的PVC表面组成，表面包围着一层砂粒，表面密度在0.5 kg/m2和3 kg/m2之间，其目的是通过类似于“非完美圆形滚珠轴承”的作用，促进摩擦阻力在0.15和0.30之间的相对滑动，这取决于设计加速度。后一种隔震方法已被广泛研究的数值和实验手段的大型测试振动台的EQUALS地震实验室的布里斯托大学。然而，鉴于尼泊尔设计和建造的世界上第一座建筑物采用了特别低成本的PVC-砂-PVC滑动界面，因此认为有必要可靠地评估摩擦系数的平均值和分散度，作为垂直压力、砂密度和饱和度的函数。使用改进的直接剪切装置进行的测试的结果在此呈现，使用砂样和PVC板，这些砂样和PVC板是在尼泊尔当地资源的，用于建筑。结果表明，摩擦力的变化是合理的低，在任何情况下，在理想的范围内，无论检查的参数，从而建立信心，即将到来的设计的新型隔离建筑。
This paper describes the results of an experimental investigation on the coefficient of friction at the interface of a PVC–sand–PVC layer that is utilised as part of a low-cost geotechnical seismic isolation devised to be used in low-income countries. The PVC–sand–PVC configuration consists of two smooth PVC surfaces enclosing a single layer of sand grains, with surface densities between 0.5 kg/m2and 3 kg/m2, which aim to facilitate relative sliding at friction resistance between 0.15 and 0.30 depending on the design acceleration, by acting like “non-perfectly rounded ball bearings”. The latter isolation method has been extensively studied both numerically and experimentally by means of large-scale testing at the shaking table of the EQUALS Earthquake Laboratory of the University of Bristol. However, in the light of the construction of the first building worldwide to be designed and constructed in Nepal with the particular low-cost PVC–sand–PVC sliding interface, it was deemed necessary to reliably assess the mean and dispersion of the coefficient of friction as a function of vertical pressure, sand density and degree of saturation. The results of the tests performed using an improved direct shear apparatus are presented herein using sand samples and PVC sheets that were locally resourced in Nepal to be used in construction. The results indicate that the variation of friction is reasonably low and in any case within the desirable range, irrespectively of the parameters examined, thus establishing confidence to the forthcoming design of the novel isolated building.
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