Research Tools for Hybrid (Experimental-Numerical) Simulations of Structures under Extreme Loads

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This proposal is aimed at acquiring research tools that will greatly advance hybrid (experimental-numerical) simulation capabilities that have been developed at the University of Toronto. The research tools consist of three items: Item #1 - adjustable testing apparatus for axially loaded structural elements, Item #2 - data acquisition/control system, and Item #3 - electric linear actuator/controller. With the proposed research tools, three unique hybrid simulation capabilities will be enabled. 1) Item #1 will allow realistic simulation of multi-storey buildings with buckling restrained braces, friction dampers, yielding dampers, or self-centering braces. 2) The existing column-testing machine at the Structural Testing Facility at the University of Toronto will be upgraded to a hybrid column tester with which any reinforced concrete column specimen can be integrated with a numerical model of the rest of the structural system. Item #2 will be used to provide an interface between a physical specimen and a numerical simulation software. 3) Item #3 will be used to develop a hybrid simulation method for cable-stayed bridges subject to wind load. Once the simulation method is developed and verified, it will be applied to practical research projects at collaborating wind tunnel testing facilities. The above research programs build upon the PI’s strong track record on hybrid simulation methods. The PI has developed a hybrid simulation framework (UT-SIM framework, www.ut-sim.ca) which has been extensively used for large-scale hybrid simulation of civil infrastructure. The PI has collaborated with co-PIs as well as many international researchers through the simulation framework. The proposed research tools will be tightly integrated with the UT-SIM framework, which will be extensively used by regional, national, and international researchers. The research programs will provide unique HQP training opportunities as well. The HQPs working in the field of structural performance assessment through hybrid simulation will gain knowledge on behaviour of structural elements, numerical modelling and simulation skills, as well as experimental skills. In the PI’s research group only, seven HQPs are currently working on unique hybrid simulation methods. Three of them will start using the requested research tools as soon as the research tools are secured. Over the next five years, at least ten HQPs will be trained through the research program, who will greatly contribute to the structural engineering industry in Canada. Overall, the research programs, which will be enabled by the proposed research tools, will greatly advance the hybrid simulation method, and allow tight integration of computational and experimental research tools. It will position the University of Toronto as a leading hub for advanced simulation of structures under extreme loading.