SEISMIC LOAD REDUCTION ON THE BRIDGE OVER LIQUEFACTION VULNERABILITY ZONE BY LEAD RUBBER BEARING

A Zakariya¹, A Rifa’i^1,*, S Ismanti¹

¹Department of Civil and Environmental Engineering, Universitas Gadjah Mada, Sleman, Indonesia, 55281

^1*Corresponding email: [email protected]

DOI: https://doi.org/10.20885/icsbe.vol4.art35

ABSTRACT

The Palu IV bridge collapsed after the 2018 Palu earthquake. Bridge failure is caused by moment force and buckling increasing simultaneously while liquefaction occurs. This study performs a simulation of the Kretek 2 Bridge by three models; pinned and roller support, bearing pad, and lead rubber bearing to understand seismic load reduction with different supports. The bridge load refers to SNI 1725:2016 and SNI 2833:2016. Site-specific response spectra are required due to near earthquake sources. The analysis result using MIDAS both bearing pads and lead rubber bearings show a significant reduction in beam forces. Axial forces, shear Y, shear Z, moment Y and moment Z, for bearing pad model were reduced to -10.79%, -7.28%, -74.59%, -65.51%, and -19.28%, respectively, whereas for lead rubber bearings model were reduced to -10.88%, +5.29%, -72.75%, -63.48%, and -7.34% respectively. However, the displacement in the bearing pad reaches 0.221m exceeding a boundary maximum of 0.050mm, so it cannot be used. Displacement of lead rubber bearing reaches 0.162m, which is still below 0.384mm. Thus, a lead rubber bearing used as a seismic isolation damper is appropriate for the Kretek 2 Bridge.

Keywords: bridge failure, bearing pad, lead rubber bearing, MIDAS, beam forces, displacement

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