ABSTRACT

Control and inspection of the conditions of elastomeric bearings used for seismic isolation purpose is a fundamental activity in ensuring and preserving the performance of a structure. The methods currently used, such as visual inspections, Operational Modal Analysis (OMA), release tests, very often present strong limitations due to their qualitative nature or else to the costs associated with their implementation and functioning.

An innovative procedure based on the use of nanoindentation tests is proposed and validated through an experimental campaign. Its main benefits consist in the possibility of quantitatively estimating the current characteristics of elastomeric bearings, in conjunction with low implementation costs and influence on the isolating devices. The innovative procedure consists of coring a very small sample of rubber from a bearing and testing it with a nano-indenter in order to estimate the actual characteristics in terms of shear stress-strain relationships. The experimental tests showed good agreement between the properties calculated with the proposed method and the ones obtained directly through a traditional shear test, making such procedure a promising tool.

抽象的

控制和检查用于隔震目的的弹性轴承的状况是确保和保持结构性能的一项基本活动。当前使用的方法，例如目视检查，操作模式分析（OMA），发布测试，由于其质量性质或与实施和功能相关的成本，经常会受到很大的限制。

提出了一种基于纳米压痕测试的创新方法，并通过实验活动进行了验证。它的主要优点在于可以定量估算弹性体轴承的当前特性，并具有较低的实施成本和对隔离装置的影响。创新的程序包括从轴承取下非常小的橡胶样本，并用纳米压头对其进行测试，以便根据剪切应力-应变关系估算实际特性。实验测试表明，该方法计算出的性能与直接通过传统剪切试验获得的性能之间具有良好的一致性，从而使该方法成为一种有前途的工具。