Stress Relaxation Behavior of Prestressing Strands Under Low temperatures

■ Design recommendations were made for predicting stress relaxation behavior based on the model and test program. Precast, prestressed concrete and prestressed steel structures have been used in many applications, such as bridges, buildings, and nuclear cooling towers. More recently, precast, prestressed concrete offshore platforms have offered solutions for the exploration of oil and gas in the Arctic region, which holds about 13% of the undiscovered oil and 30% of the undiscovered gas in the world. Precast, prestressed concrete structures in the Arctic region are challenged by the harsh environment, especially the low temperatures, which reach about -70°C (-94°F).