Sanada, Sashim, and Sugiura 2011
The authors propose a new energy dissipation device to be attached to PC members to improve their energy dissipation capacity, something that has traditionally been lower than that of RC buildings. Structural damage in PC buildings can also be reduced by their self-centering characteristics. In order to improve seismic energy dissipation of PC buildings, friction dampers were developed. Several structural tests were performed to verify their contribution to the seismic performance of a PC beam.
Experimental Study, Results and Discussion
Repeated loads were applied to the damper to measure the induced friction forces under tensile loading. An unbonded PC specimen was prepared to apply the friction damper. Reversed cyclic loads were used. From tests, asymmetric contributions were observed in each loading directions. Damper contributions were different in positive and negative directions due to the different distances between the axis of rotation and center of the damper. The damper also increased residual deformations after unloading, something that could be canceled by releasing the compression force acting on the damper.
Reference
Sanada, Y., Sashima, Y., and Sugiura, H. (2011). “Development of an Energy Dissipation Device for Pre-stressed Concrete Members,” Proceedings of the 8th International Conference on Urban Earthquake Engineering, Tokyo Institute of Technology, Tokyo, Japan, March 7-8.