STUDY OF A PHENOMENOLOGICAL MODEL FOR ELASTOMERIC BEARINGS
Elastomeric bearings are one of the most commonly used seismic isolators, whose considerably grown number of applications in recent years witnesses the confidence in seismic isolation. On the other hand, full-scale experimentation of isolators, so far conducted in a limited number of international facilities, focused the attention to unexpected collapses, highlighting how the assessment of the seismic behavior of base-isolated structures strongly depends on the accuracy of the isolators modeling. With some exception, models present in literature are generally intended to represent the overall isolator behavior, without information on the state of internal layers, where some rubber layer may show high deformations that can unevenly damage the layer itself and influence the global stress distribution. The main objective of the present work is to develop a phenomenological model able to represent the force-deformation state of each layer of the device. The proposed model includes geometric nonlinearities in the formulation and material nonlinearities in the constitutive laws, defined by a number of parameters which are calibrated coupling a system identification approach and a sensitivity analysis in the interpretation of the experimental test results on full-scale bearings carried out at the EUCENTRE TREES Lab of Pavia (Italy). The model is found suitable to represent the experimental response.
Rubber bearings analytical model seismic isolation experiments shake table
C. Casarotti A. Pavese
European Centre for Training and Research in Earthquake Engineering, Pavia. Italy Dept. of Structural Mechanics, University of Pavia, Pavia, Italy
国际会议
14th World Conference on Earthquake Engineering(第十四届国际地震工程会议)
北京
英文
2008-10-12（万方平台首次上网日期，不代表论文的发表时间）