MCEER RESEARCH TASK STATEMENT Thrust Area: 2 Budget: Yr 9 Assigned Project Number: 9.2.2 Task Title: Controlling Response of Structural and Non-Structural Components and Systems in Acute Care Facilities by Passive Displacement-Activated Damping and Isolation Mechanisms Investigator/ Institution: Michel Bruneau, University at Buffalo* Andre Filiatrault, University at Buffalo Michael Constantinou, University at Buffalo *indicates task leader Statement of Project Goals: (Conceptually describe what the work is intended to accomplish, in 100 words or less . Do not provide detailed description here.) This task investigates the use of metallic displacement-based energy dissipation systems on achieving integrated resilience objectives for structural and non-structural systems. The concepts developed are valid for a broad range of metallic energy dissipation systems, but two systems are considered for the specific implementation studies in the MCEER West Coast Demonstration Hospital, namely Steel Plate Shear Wall Systems (SPSW) and Buckling Restrained Braces (BRB). These passive displacement-activated damping systems provide significant stiffening and strengthening that can effectively help achieve the structural resilience objectives. They are combined with isolation systems for non-structural components and floor systems to achieve the non-structural performance objectives. Research also takes advantage of the work on the structural-fuse concept considered in earlier Year 8. Research efforts are also invested to expand previous findings on SDOF systems to MDOF structures. Note that all work herein is applicable for both the retrofit of existing hospitals, or the design of new ones. Problem Description and Research Approach of Proposed Work for Year 9: (Detailed description of research to be conducted and methodology to be used.) This task focuses on controlling response of structural and non-structural components and systems in acute care facilities by passive displacement-activated damping and isolation mechanisms. Research will proceed by expanding on the results obtained in Year 8 work. On one hand, the design procedure proposed for structural fuses will be verified experimentally using a multi- story frame and a BRB strategy, with proposed connection details intended to ensure the target physical structural resilience objectives and allow to facilitate replacement of the sacrificial energy dissipating element, in compliance with the structural fuse philosophy. The performance of non-structural components and contents will be investigated through experimental study of the floor response. Analytically derived information on floor response indicates that the displacement-based strategies considered here are effective in reducing drift, but velocity and acceleration response could increase or decrease, depending on the period of the non-structural component (see Figure 1). This may result in satisfactory or unsatisfactory performance, for