Utah State University
Thermal bowing is out-of-plane wall deflection, which is a common issue on sandwich panel walls caused by a temperature differential between a building interior temperature and the environmental conditions.
This report aims to better understand thermal load response of concrete sandwich wall panels. Full-scale testing was performed to verify the assumptions regarding thermal gradient, temperature variation at the cross-section level and thermal conductivity of the connectors.
It was found out that carbon fiber reinforced polymer nor glass fiber reinforced polymer connectors transfer a significate amount of heat from one wythe to the other, hence, the temperature in one wythe remained constant while the other was heated. Thermal bowing was measured, and it was found that following a rapid increase in temperature the out-of-plane deflection resulted in a relatively linear relationship between the temperature gradient and bowing.
Pozo-Lora, Fray and Maguire, Marc, "Thermal Bowing Testing of Precast Concrete Sandwich Wall Panels" (2019). Civil and Environmental Engineering Faculty Publications. Paper 3621.