Determination of the serviceability of bridge upper structures (Case study: Sangsang River bridge at Tohpati-Kusamba highway, Bali)I Nyoman Sutarja, Ida Bagus Rai Widiarsa and I Made Alit Karyawan SalainMATEC Web Conf., 276 (2019) 01039DOI: https://doi.org/10.1051/matecconf/201927601039