Elevated temperature creep model of parallel wire strands
Yong DU1, Yongjin WU1, Abdullahi M. UMAR1, Shaojun ZHU2()
1. College of Civil Engineering, Nanjing Tech University, Nanjing 211816, China 2. College of Civil Engineering, Tongji University, Shanghai 200092, China
Parallel wire strands (PWSs), which are widely used in prestressed steel structures, are typically in high-stress states. Under fire conditions, significant creep effects occur, reducing the prestress and influencing the mechanical behavior of PWSs. As there is no existing approach to analyze their creep behavior, this study experimentally investigated the elevated temperature creep model of PWSs. A charge-coupled camera system was incorporated to accurately obtain the deformation of the specimen during the elevated temperature creep test. It was concluded that the temperature level had a more significant effect on the creep strain than the stress level, and 450 °C was the key segment point where the creep rate varied significantly. By comparing the elevated temperature creep test results for PWSs and steel strands, it was found that the creep strain of PWSs was lower than that of steel strands at the same temperature and stress levels. The parameters in the general empirical formula, the Bailey–Norton model, and the composite time-hardening model were fitted based on the experimental results. By evaluating the accuracy and form of the models, the composite time-hardening model, which can simultaneously consider temperature, stress, and time, is recommended for use in the fire-resistance design of pre-tensioned structures with PWSs.
. [J]. Frontiers of Structural and Civil Engineering, 2023, 17(7): 1060-1071.
Yong DU, Yongjin WU, Abdullahi M. UMAR, Shaojun ZHU. Elevated temperature creep model of parallel wire strands. Front. Struct. Civ. Eng., 2023, 17(7): 1060-1071.
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