Effect of tensile axial loading on seismic performance (plastic shear deformation) of a laminated rubber bearing (LRB) was clarified. Cyclic loading tests were carried out to evaluate the relation between lateral force and lateral displacement of an LRB under seismic conditions (i.e., axial loading) and under worn conditions (i.e., 300 cycles). A strain measurement scheme based on image analysis was used to obtain the local strain fields of the LRB. Localized strain fields under tensile axial loading occurred more markedly at the corners of the free surface of the LRB than those under compressive axial loading. The seismic performance of the LRB under tensile or compressive axial loading was degraded severely after shear deformation incurred during 300 cycles.
展开▼
