Study of Simplified Calculating Model on Friction Correlated Prestress Loss for PC Bridges

Shi, Huibin; Guo, Qi

doi:10.1088/1755-1315/510/5/052066

Cited by 1 publication

(1 citation statement)

References 3 publications

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“…In terms of the abovementioned structures, the value of efective prestress during service plays a crucial role in their security state. However, the prestress losses due to concrete shrinkage and creep [6,7], duct friction [8], relaxation of steel strands [9], corrosion [10], and other external efects [11] are unavoidable. Once the efective prestress is reduced to a certain threshold, the structural performance can be signifcantly degraded and may even lead to structural damage [12,13].…”

Section: Introductionmentioning

confidence: 99%

Nondestructive Testing and Health Monitoring Techniques for Structural Effective Prestress

Jia,

Zhang,

et al. 2023

Structural Control and Health Monitoring

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Prestressed structures are widely employed in bridges and large-span spatial structures, and the accurate evaluation of prestress state is of great importance for structural maintenance. This paper reviews the nondestructive testing (NDT) and health monitoring techniques for structural effective prestress. Specifically, the fiber Bragg grating (FBG) sensor-based, magnetic-elastic (ME) sensor-based, dynamic response-based, ultrasonic guided wave (UGW)-based, electromechanical impedance (EMI)-based, and electrical resistance-based methods are reviewed in this paper. Firstly, the principle, application range, and measuring accuracy of each technique are introduced and analyzed, and the benefits and limitations of each technique are summarized: The FBG sensor and ME sensor take on high measuring accuracy and have been applied in practical engineering, but they are required to be preinstalled during structural construction; the dynamic response-based method is greatly effective in cable force assessment but not suitable for prestress evaluation of prestressed concrete (PSC) structures; the UGW-based, EMI-based, and electrical resistance-based methods have shown favorable potential for prestress assessment in laboratory experiments, but their feasibility and accuracy in practical engineering need to be verified. Secondly, the challenges and discussion of each method are discussed in the following four aspects: measuring range, reliability of measuring results, stability and durability considering long-term monitoring, and cost-efficiency. Finally, a decision tree is proposed to choose the most appropriate prestress evaluation method in a specific application scenario.

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