Abstract
After the 2011 off the Pacific coast of Tohoku Earthquake, contents for seismic assessment of transmission towers far exceed the assumption of the past assessment. Limit state evaluation is performed for the seismic assessment of transmission towers during Level 2 earthquake motion, and the importance of damping constant increases in evaluating seismic performance. The purpose of this paper is to investigate the equivalent damping constant used for seismic performance evaluation of transmission towers with a new kinetic energy absorption device. That is, the kinetic energy absorption performance of lead filling shear bolt joint is examined by material tests on lead and cyclic loading tests of the joint model. Furthermore dynamic response analyses using a transmission tower model with the damper are executed under two Level 2 seismic motions, and the effectiveness of the damper is confirmed.
