Struktur utama sangat berbahaya terhadap kebakaran dengan temperatur yang sangat tinggi dan berdampak pada kerugian struktur atau materil. Struktur baja diketahui dapat kembali lagi pada kekuatan sebelumnya. Akan tetapi belum diketahui apakah struktur komposit akan kembali ke kondisi awal. Spesimen uji mempunyai delapan unit, masing-masing terdiri dari empat spesimen balok komposit stud-connector bold (SP) dan empat spesimen balok komposit UNP connector (SF). tiap spesimen mempunyai control yaitu SP/020 dan SF/020 tanpa pengujian pembakaran, dan enam spesimen lainnya dilakukan uji bakar yaitu SP/400, SP/550, SP/700 dan SF/400, SF/550, SF/700 yang dibakar dalam tungku dengan temperatur sesuai kode spesimen masing-masing 400°C, 550°C dan 700°C, dengan kondisi diberikan beban terpusat sebesar 12 kN. Tujuan dari penelitian ini adalah mengetahui kinerja girder komposit elemen jembatan pasca kebakaran terhadap factor durasi dan temperatur pembakaran dan pengaruh kinerja balok terhadap stud-connector bold (SP) dan UNP connector (SF). Penelitian ini menghasilkan beberapa kesimpulan diantaranya; (1) proses pembakaran baja menunjukkan bahwa keruntuhan pada spesimen balok baja komposit dipengaruhi beban, durasi pembakaran dan temperatur yang mengakibatkan lendutan residual (2). Pengujian lentur memperlihatkan akibat temperatur, beban, dan durasi tidak memberikan pengaruh yang terhadap kapasitas beban struktur balok pasca pembakaran (3) Hasil pengujian uji tarik baja pasca kebakaran, temperatur dan durasi specimen SP/400 mengalami persentasi kehilangan kekuatan sebesar 13,63% dan specimen SP/550 14.57%. Specimen SF/400 mengalami persentasi kehilangan kekuatan sebesar 7,26% dan specimen SP/550 0,10%. Spesimen tidak mengalami torsional buckling. Kata kunci: Pembakaran, temperatur, komposit, waktu, beban.

The main structure is very dangerous against fires with very high temperatures and resulting in structural or material losses. Steel structures are known to return to their former strength. However, it is not known whether the composite structure will return to its initial conditions. The test specimens have eight units, each consisting of four specimens of composite stud-connector bold (SP) beam and four specimens of UNP connector (SF) composite beam. Each specimen has a control, namely SP / 020 and SF / 020 without combustion testing, and the other six specimens are subjected to a burn test, namely SP / 400, SP / 550, SP / 700 and SF / 400, SF / 550, SF / 700 which are burned in furnace with a temperature according to the specimen code, respectively 400°C, 550°C and 700°C, with a central load of 12 kN. The purpose of this study was to determine the performance of post fire bridge element composite girders on the duration and combustion temperature factors and the effect of beam performance on stud-connector bold (SP) and UNP connector (SF). This study resulted in several conclusions including; (1) the steel burning process shows that the collapse of the composite steel beam specimen is influenced by the load, burning duration and temperature which results in residual deflection (2). The flexural test shows that the effect of temperature, load, and duration does not have a significant effect on the load capacity of the post-combustion beam structure (3) The results of the post-fire steel tensile test, temperature and duration of the SP / 400 specimen experience a percentage of loss of strength of 13.63% and the specimen SP / 550 14.57%. The SF / 400 specimen had a percentage loss of strength of 7.26% and the SP / 550 specimen 0.10%. The specimen did not undergo torsional buckling. Keywords: Combustion, temperature, composite, time, load.

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