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System Behavior Factors for Composite and Mixed Structural Systems

Aritra Chatterjee and Cristopher D. Moen

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Yibing Xiang and Sanjay Arwade University of Massachusetts, Amherst Amherst, MA

Benjamin W. Schafer Johns Hopkins University Baltimore, MD 

Structural design continues to be a component based process, typically check-ing beam, column and connection capacities against design demands. However, end-user safety in the event of natural hazards hinges on system performance. The challenges in casting structural design as a ‘system-based’ process stems from a fundamental lack of understanding how component level properties, namely component ductility and uncertainty, propagate to system behavior —  redundancy, overstrength and system ductility.

This National Science Foundation sponsored Grant Opportunities for Academic Liaison with Industry (GOALI) project, coordinated through the Cold-Formed Steel Research Consortium , www.cfsrc.org, seeks to meet this challenge for typical building structural systems: roof, walls, and floors. Build-ings framed from cold-formed steel are targeted for initial application. The industry partner, the American Iron and Steel Institute (AISI), is working directly with the academic re-search team to insure the research has maximum impact on the practical design of cold-formed steel building sub-systems.

So far the focus has been on wood-sheathed cold-formed steel floor sub-systems under in-plane lateral loads (wind or seismic). High-fidelity finite element models have been developed in ABAQUS and shown to replicate real behavior previously seen in mon-otonic experiments. Surrogate models were generated to study system response in a computationally efficient manner, and dedicated experiments were used to determine component response and uncertainty. These were coupled together to generate system-level strength distributions at first yield and ultimate limit states, and it was shown that component load-deformation behavior has a great impact on system over-strength and ductility. The ongoing parallel efforts are focused on generalizing these methods, and building a full-scale experimental setup at Virginia Tech for testing floor diaphragm sub-systems in order to validate the computational models.

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#V4Issue1 #Volume4

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