<![CDATA[Educational buildings must maintain structural reliability throughout their service life, particularly as usage intensity and functional demands increase over time. The Tunas Building of the Faculty of Engineering, Universitas Gunung Jati, requires an objective, field-based structural evaluation rather than an assessment based solely on original design assumptions. This study aimed to evaluate the structural performance of reinforced concrete columns through an integrated forensic audit approach using non-destructive testing (NDT) and numerical structural analysis. A quantitative evaluative approach was applied to 36 columns selected through purposive sampling. Visual inspections were conducted to identify surface defects, followed by Schmidt Rebound Hammer testing (ASTM C805) to estimate concrete compressive strength and Ultrasonic Pulse Velocity (UPV) testing (ASTM C597) to assess internal concrete quality. The relationship between the two NDT methods was analyzed using Pearson correlation, while structural capacity was evaluated through ETABS modeling based on SNI 2847:2019, SNI 1727:2020, and SNI 1726:2019. The results showed minor hairline cracks and localized honeycombing in a limited number of columns. Rebound Hammer testing produced an average estimated compressive strength of 37.2 MPa, ranging from 32–40 MPa, which met the minimum requirements for structural concrete. UPV testing classified 97.22% of measurement points as “Good” and 2.78% as “Very Poor.” Pearson correlation analysis indicated a significant positive relationship between the two testing methods (r = 0.489; p = 0.002). ETABS Design Check results showed that 35 of 36 columns (97.22%) met the required strength criteria, while one column (2.78%) did not satisfy the requirements. Overall, the existing structure remained structurally adequate for service, although the failed column required further investigation and potential strengthening measures]]>
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