Studi Kelakuan Dinamis Struktur Jembatan Penyeberangan Orang (JPO) Akibat Beban Individual Manusia Bergerak
DOI:
https://doi.org/10.5614/jts.2012.19.3.1Keywords:
Beban hidup, Manusia bergerak, Dinamis, Jembatan penyeberangan orang.Abstract
Abstrak. Penelitian ini bertujuan mengetahui pengaruh beban manusia bergerak pada struktur JPO beton dan baja. Manusia sebagai beban dinamis sangat mempengaruhi dalam merencanakan jenis struktur tertentu, seperti stadion, lantai gedung olahraga, atau JPO. Apabila beban manusia tersebut tidak dipertimbangkan sebagai beban dinamis maka dapat menjadi penyebab kegagalan struktur. Dalam studi ini dilakukan pemilihan model beban akibat manusia bergerak dari literature yang ada. Dalam penelitian ini dibatasi hanya pada model beban manusia individu. Dengan menggunakan software SAP2000, pembebanan ini akan dihitung secara dinamis, sehingga akibat orang yang bergerak akan menghasilkan reaksi vertikal dan horisontal serta berubah terhadap waktu. Selanjutnya dilakukan pengujian nilai frequensi alami dari jembatan yaitu pada uji kasus dilakukan JPO beton dan JPO baja di Surabaya. Untuk mode pertama, bentuk getaran dari struktur JPO beton didominasi oleh arah horizontal dengan frekuensi alami 2.75 Hz. Sedangkan untuk struktur JPO baja didominasi oleh arah vertikal dengan frekuensi alami 7.675 Hz. Kedua struktur memiliki nilai frekuensi alami yang memenuhi ketentuan British Standard dan diketahui pula bahwa tidak terjadi resonansi pada struktur JPO akibat beban manusia berjalan. Dengan adanya penelitian ini diharapkan kelakuan dinamis struktur jembatan penyeberangan orang akibat beban manusia yang bergerak bisa lebih dipahami.Abstract. This study aimed to investigate the effect of human-induced dynamic loads on steel and concrete footbridges. The dynamic loads would greatly affect to design of certain types of structures such as stadium, floor for dance or sport, or footbridge. If the kind of loads was not considered in the design as dynamic loads that could be the cause of structural failure. The model of the dynamic loads was found from the existing literature. The human loads were limited to individual model in this study. The dynamic responses of footbridge structures were investigated using SAP2000 and showed that the concrete bridge is less stiff than the steel bridge based on the natural frequencies. The results also showed that the first mode of the concrete footbridge was dominated by horizontal direction with the natural frequency of 2.75 Hz. While the first mode of the steel footbridge was dominated by the vertical direction with natural frequency of 7.675 Hz. Both structures had the natural frequencies which complied with the British Standard and also found that there was no resonance on both footbridges due to human-induced dynamic loads. From the acquisition of some of the above conclusions, it was expected that the dynamic behavior of the footbridge due to the human dynamic loads could be better understood.
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