KAJIAN RESPON JEMBATAN DI ACEH UTARA TERHADAP GEMPA BERDASARKAN DATA MIKROTREMOR

The parameters of the bridge's resistance to dynamic loads, such as natural frequency and damping ratio, were determined by theoretical experimental modal analysis. Microtremor measurements performed on two types bridges: steel truss bridges reinforced concrete bridges. goal is establish value characteristics well feasibility based SNI 2833-2008's vibration period limit. test used compare frequencies determine condition integrity level stiffness structure or structural elements. HVSR (Horizontal Vertical Spectral Ratio) approach analyze microtremor data ground, while FSR (Floor RDM (Random Decrement Method) analysis According findings first case study, soil 1.25–1.35 Hz. from 0.81–3.29 Hz, values are 1.12–3.46 indicating that produced less stable NS component. ratio 2.02–4.97% in this case. same was carried out a different type bridge second with ground 1.11 - 1.47 2.21 3.62 results 2.30 In each component, found tends be stable. result 2.05 4.81%. shows identical calculation results, average being 7.24% greater than results. data, around 3.16% . This accordance literature, which 2-5%.