Seismic Behaviour of Multi-Story Timber-Steel Hybrid Structures With Supplemental Dampers

Abstract eng:
Timber-steel hybrid structures combine a steel frame with timber infill walls to create an efficient lateral load resisting system. Timber infill walls however, suffer damage, sustain residual deformations during major earthquakes, and therefore require extensive repair or even replacement if the cost of repair is prohibitive. In this contribution, it is examined if the use of supplemental dampers can protect timber walls from early damage and dissipate energy during earthquakes to control the seismic response. To this end, a simple novel timber-steel hybrid structure system with supplemental dampers is first described. This system, relies on the response of a conventional flexible steel frame to provide an elastic restoring force and on hysteretic energy dissipation devices that are installed between the steel frame and timber shear wall to control the seismic response while eliminating all damage to the shear walls. A case study of a 4-story building incorporating this novel concept is designed using the P-Spectra method and the Chinese code and then its response is investigated numerically. Nonlinear time-history analyses under a suite of seismic records scaled to 4 different hazard levels, i.e. minor, moderate, major and extreme is done numerically using the OpenSees modeling platform. Results show that the damped system has a more uniform inter-story drift distribution, attracts less seismic load, and has smaller displacement response. Dampers are able to dissipate energy instead of the infill walls and protect the wall from unrepairable damage. The residual deformation of the damped system is also smaller than the undamped damaged system after extreme earthquakes.

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