Experimental Evaluation of Factors Affecting Tensile Capacity of Connection between Lead Damper and Concrete Foundation

摘要

It has been strongly requested in highly seismic areas to consider not only structural performances but also maintenances of aseismic members in design procedure. Base-isolated structures have both functions to be applied to important buildings. However, brittle fractures at the connections between lead dampers and concrete foundations were observed in 2005 Fukuoka Earthquake. Seismic resistance of damper is transmitted to concrete foundations through the anchor bolts. Therefore, these connections require sufficient stiffness and strength to prevent their deformation and fracture even if dampers are damaged by seismic load. Tensile tests on anchor bolts were conducted to evaluate some factors affecting tensile capacity and failure modes. The main parameters were types of anchor bolts commonly used in anchorage of the lead dampers and layout of reinforcement around the anchor bolt. Based on results of tensile tests, Factors affecting tensile behavior of anchor bolt were discussed.