Nondestructive Testing and Health Monitoring Techniques for Structural Effective Prestress

Table 4

Research studies on prestress evaluation of PSC structures based on dynamic response.

Publication year	Researchers	Structural type	Research method	Acquisition method for vibration response	Experimental result
1991	Hop [113]	PSC beam	Laboratory experiments	Vibrograph, oscillograph	With the increase of prestressing force, the vibration frequency first increased and then decreased
1994	Saiidi et al. [111]	PSC beam	Field and laboratory experiments	Accelerometer	The first frequency slightly increased with the increase of prestressing force
2010	Kim et al. [43]	PSC T-shape girder	Laboratory experiment	Accelerometer	The natural frequency increased with the increase of prestressing force
2010	Kim et al. [114]	PSC beam	Laboratory experiment	Accelerometer	The longitudinal frequency showed a nonlinear increase with the increasing prestress
2011	Zhong et al. [115]	Box girder with vertical prestressed bars	Laboratory and field experiments	Accelerometer	The frequency increased with tension force
2012	Ho et al. [112]	PSC T-shape girder	Laboratory experiment	Accelerometer	The natural frequency increased with the increase of prestressing force
2016	Noble et al. [116]	PSC beam	Laboratory experiment	Accelerometer	No statistically significant relationship between natural frequency and posttensioning load level were found
2018	Rashetnia et al. [117]	PSC beam	Laboratory experiment	Accelerometer	The use of dynamic vibration can quantify the loss of prestressing force
2019	Bonopera et al. [118]	PSC beam	Laboratory experiment	Velocity seismometer	No change in fundamental frequency with increasing prestressing force