Evaluating Seismic Response and Structural Adequacy of a Reinforced Concrete Laboratory Building under Earthquake Loads
This study evaluates the structural performance of the Engineering Laboratory Building at Muhammadiyah University of Mataram as an educational building classified as Risk Category IV in an area with high seismic hazard. The analysis was conducted through modeling of the reinforced concrete frame using the equivalent static method and response spectrum analysis in accordance with national standards. The results show a fundamental period of the structure of 0.536 seconds (X-direction) and 0.536 seconds (Y-direction), reflecting relatively balanced stiffness. The base shear force from the dynamic analysis 5860.80 kN meets the minimum requirement of 85% of the equivalent static method value of 5860.75 kN. The maximum inter-story drift recorded at 0.092 m remains below the allowable limit of 0.1026 m, or equivalent to 0.02 hsx. Analytically, these findings indicate that the structure possesses controlled deformation capacity and proportional force distribution. The scientific contribution of this research lies in the validation of the existing structure’s performance through a comparative analysis of the two methods, thereby strengthening the foundation for evaluating the design of earthquake-resistant buildings.