Advances in Structural Engineering Research
Full Session with Abstracts
337103-6 - Predicting the Performance of a 13-Foot-Thick Shear Experiment without Stirrups
Friday, April 20
1:30 PM - 3:00 PM
How does this session impact and improve the Structural Engineering Profession?
Performance Based Design is an important area of structural design and one that can be expected to grow in the future. The ability (or not) to predict the behaviour of a simple one-way slab system should give us confidence (or not) in how this process goes forward.
In some design situations there are demands for very thick one-way slabs to be constructed out of reinforced concrete without stirrups. The ACI Shear design equations suggest that there is no significant size effect in shear while other codes suggest that there is a significant one. To find out which prediction is more accurate, a 13 foot thick 65 foot long shear experiment was performed in Toronto in 2015. Prior to the test being done, predictions were requested for what the behaviour of the test should be. A total of 66 predictions were obtained, 33 from industry and 33 from academia. This presentation and paper will summarize the results of the test and discuss the quality of the predictions with particular emphasis placed on conclusions that are relevant for performance based design. The presentation will include information about two practical structures with details similar to that tested and thus will be relevant to design engineers.
People who see this presentation will learn to be careful when modelling members of this depth as the ACI Code is dangerously unsafe it its 2014 iteration. Also it will be clear that the profession needs to do better with regard to performance-based situations as the quality of the predictions was poor.