Abstract
Damping is one of the important issues related to isolated structures, including the newly proposed low-cost spring-asphalt isolation system. In this study, the damping properties of the system in terms of displacement dependence, frequency dependence and temperature dependence were studied by a cyclic simple shear experiment. Then, the direct least-square method was used to identify the damping properties from the experimental data. Furthermore, to validate the effectiveness of the damping device, a modal analysis was conducted based on multi-dimensional shaking table tests. The results indicate that (1) the hysteretic curves are similar to an ellipse, which means that the asphalt shows characteristics of viscoelastic materials; (2) the damping properties are positively related to the loading frequency and inversely related to the temperature and displacement; and (3) asphalt can provide adequate damping and reduce the displacements of the superstructure by nearly half. On the basis of the experimental test results, an analysis of the modal information with multi-dimensional input is also presented.
Highlights
Three-dimensional isolation systems have been studied by numerous scholars all over the world [1,2,3,4,5,6]
The results indicate that (1) the hysteretic curves are similar to an ellipse, which means that the asphalt shows characteristics of viscoelastic materials; (2) the damping properties are positively related to the loading frequency and inversely related to the temperature and displacement; and (3) asphalt can provide adequate damping and reduce the displacements of the superstructure by nearly half
The analytical results of cyclic simple shear tests are the basis of the application of spring-asphalt
Summary
Three-dimensional isolation systems have been studied by numerous scholars all over the world [1,2,3,4,5,6]. Wang and Zeng [8] studied the temperature-dependent properties of asphalt through a resonant column test Their results showed that the damping ratio of all samples was highly dependent upon the temperature. The damping ratio increased as the temperature of the Tavassoti-Kheiry et al [9] conducted resonant column tests of different asphalt mixtures to study the frequency-dependent characteristics of the modulus. Using the DSR method, a cyclic simple shear instrument was used in the present study to dependence and displacement dependence properties and the effect of the HCC mass ratio of asphalt directly change the loading frequency and displacement. To validate the effectiveness of the dependence and displacement dependence properties and the effect of the HCC mass ratio of asphalt damping properties of asphalt, time-domain, frequency-domain and modal analyses were conducted were comprehensively studied by cyclic simple shear tests. Some additional work was conducted to identify the dynamic damping ratio with multi-dimensional input
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