PRESENTATION – Friction Sliding Devices for Earthquake Resistant Buildings: Experimental Testing and Modelling

When – Wednesday 7th December 2016 //

Abstract:

To reduce the seismic demand, friction sliding devices installed in the structural system of buildings are a cost-efficient solution. Friction devices dissipate energy through the relative sliding developed between two solid interfaces. To characterize the behavior of friction-sliding devices an experimental program was conducted. In this program, four full-scale specimens were subjected to cyclic quasi-static and real-time accelerogram loading. Among them, two full-scale specimens comprising a friction-sliding device installed in-line with a diagonal brace member designed for Vancouver and Montreal were investigated. This presentation summarises the findings of that research.

About Friction Sliding Devices:

Friction sliding devices can be installed in-line with a single-diagonal or chevron steel braces, at the intersection of X-bracing system, and in-parallel with the beam located at the top of chevron bracing system. The slip force activation occurs when the internal force triggered in the system during the ground motion excitation reaches the value resulted from design. The available slip length of any friction damper should be greater than that associated to the maximum interstorey drift demand computed at the code design level. In general, forces generated by these devices are in-phase with the internal forces resulting from ground motion shaking.

To simulate the response of a friction-sliding brace, a detailed OpenSees model was developed and calibrated against experimental test results. Then, the seismic response of a low-rise building located in Victoria, BC, Canada was analyzed and the investigated parameters were: interstorey drift, residual interstorey drift and floor acceleration. From nonlinear dynamic analysis it was found that adding friction-sliding devices to steel braced frames the floors acceleration was substantially reduced, while the residual interstorey drifts increase. To re-center the system after earthquake shaking, either a back-up moment resisting frame or a self-centering system should be added in parallel to the existing friction-sliding braced frame.

About the Speaker:

Dr. Tirca completed her PhD in 2001 in the field of structural engineering. From 2002 to 2003 she was a postdoctoral fellow at Ecole Polytechnique Montreal and joined Concordia University in 2008. From 2003 to 2008, Dr. Tirca worked as a structural engineer in Montreal for the engineering firms Canam Group and Genivar. Her research interest is in the field of earthquake engineering, design of steel structures, innovative structural systems, connection behavior, retrofit design and resilience of building structures. She is a licensed professional engineer in the province of Quebec, Canada. In addition, she is a member of Task Group 3 of the ASCE Technical Council on Life-Cycle Performance, Safety, Reliability, and Risk of Structural Systems (Nov. 2014 - Sept. 2017), a member of the ASCE Committee on Disaster Resilience of Structures, Infrastructures and Communities (June 2013 – April 2017) and member of the Canadian Institute of Steel Construction, the American Society of Civil Engineers (ASCE) and the Earthquake Engineering Research Institute. Her research awards include the Japan Society for the Promotion of Science fellowship (2000). Prof. Tirca holds several research grants and published more than 60 journal and conference papers. She teaches undergraduate and graduate courses in the field of design of steel structures and seismic assessment and retrofit design of existing building structures.

Attendees:

ASG Presentation Friction Sliding Device for seismic restraint

ASG Presentation Friction Sliding Device for seismic restraint

ASG Presentation Friction Sliding Device for seismic restraint