Nondestructive Testing and Health Monitoring Techniques for Structural Effective Prestress

Table 6

Application scenarios, advantages, and limitations for each method.

Method	Application scenario	Advantage	Limitation	Engineering application
FBG sensor-based method	Preinstalled in newly built structures	High precision and high measuring range	Not suitable for in-service structure	Yes
ME sensor-based method	Preinstalled in newly built structures	High precision, high sensitivity, and fast response	Not suitable for in-service structure, vulnerable to temperature	Yes
Dynamic response-based method	Cable structure	High precision, enabling noncontact measurement	Not suitable for embedded steel strand	Yes
UGW-based method	—	Wide detection range and low signal attenuation	The precision acoustoelastic effect-based method is susceptible to measuring errors in the propagation length	No
EMI-based method	—	Sensitive to local damage	Vulnerable to temperature	No
Electrical resistance-based method	—	High sensitivity and small measuring error	Vulnerable to current heating effect	No