Evaluation the Structural Capacity of Hotel Mutiara I for into a Shopping Center

  ABSTRACT : Mutiara 1 Hotel in Yogyakarta was iconic heritage old buildings, which are planned to be change function as shopping centers, require comprehensive structural assessments to meet technical feasibility standards in support of building permit applications in Indonesia. The objective of this study is to evaluate the existing quality of concrete in structural elements—specifically beams, columns, and slabs—as a basis for structural calculations. The investigation employed both non-destructive testing (NDT) and destructive testing (DT), including Ultrasonic Pulse Velocity (UPV), rebound hammer tests, core drilling, and hardness testing. According to SNI 1727:2020, the design live load for hotel buildings is 4.79 kN/m², which increases to 6.00 kN/m² for shopping centers—a 125% increase. The average concrete strength obtained from all testing methods exceeded 25 MPa. In reference to SNI 2847:2019, public building structures must use concrete with a minimum compressive strength of 21 MPa and reinforcement steel with a yield strength of 360 MPa. Structural analysis results indicated that while most elements remain reliable, several require strengthening. Carbon Fiber Reinforced Polymer (CFRP)is recommended can increase axial capacity in columns by 139%, shear capacity in beams by 543%, and flexural capacity by 109% with one strip.

KEYWORDS: Schmid Hammer; Ultrasonic Pulse Velocity; Core Drill Test, Compressive Strength