Q: Regarding the loading protocol of Jack 2, was yielding of the reinforcement monitored in both layers of the flexural reinforcement in the topping? For example, was Jack 2 fixed in case of yielding of the bottom layer (with diameter 12 mm in both tests) while the top layer (diameter 20 mm or 25 mm) was not yielding yet?

A: The yielding of the reinforcement is monitored through a set of LVDT's above the intermediate support, connected to the concrete surface. The loading protocol of Jack 2 is activated if we have clear evidence that a plastic hinge has formed globally.