Detail ANALISIS VORTEXINDUCED VIBRATION PADA PYLON JEMBATAN CABLE STAYED Bibliografi Author: SURIANA, NICOLAS ; Gunawan, Harjadi (Advisor) Topik: vortexshedding; vortexinduced vibration; natural frequency; long span bridge Bahasa: (ID )     Penerbit: Program Studi Teknik Mesin Fakultas Teknik Unika Atma Jaya     Tempat Terbit: Jakarta    Tahun Terbit: 2018     Jenis: Theses - Undergraduate Thesis Fulltext: 110-Nicolas Suriana-2014041100.pdf (3.22MB; 3 download) Ketersediaan Perpustakaan Pusat (Semanggi) Nomor Panggil: Non-tandon: tidak ada Tandon: 1  Lihat Detail Induk Abstract Cable stayed bridge is a bridge consisting of one or several pylons or towers connected with cables that support the bridge deck. The structures of slender high-rise bridge towers often exhibit aerodynamic instability such as oscillations caused by vortex shedding.A structure can resonance if the vortex shedding frequency is equal to the natural frequency of the structure, this phenomenon is called vortex induced vibration which can cause fatigue structure failure.The research on vortex induced vibration in long span bridge pylon was done at BBTA3 (Center for Aerodynamic Technology, Aeroelastika and Acoustics) Puspiptek using two pylons, pylon bridge made by researcher and pylon bridge which located at BBTA3.Finite Element Method and modal testing were chosen as the method to obtain natural frequency values on both pylons.Simulation of Finite Element Method is done using ANSYS MECHANICAL software, in this method the simulated pylon modeling of the bridge is only the bone of the two pylons.This simulation aims to produce six vibration modes along with the natural frequency of each pylon.The simulation results show that the pylon natural frequency value of bridge design is bigger than bridge pylon at BBTA3.Modal testing aims to compare the natural frequency value of the simulation results with the natural frequency value of capital testing results, the type of modal testing used is impact testing.Pylon modeling of bridges on modal testing uses external geometry, the hard foamscover the bone of the bridge pylon.The pylon natural frequency value of the bridge of modal testing results is bigger than the natural frequency value of the simulation result, because the mass of the pylon increases because of the external geometry.The modal testing on the BBTA3 bridge pylon is also done with the pylon condition given the load (mounted bridge deck), the result is its natural frequency is bigger than without the load because the load adds rigidity from the pylon of the bridge.Another test is a test using a wind tunnel LIWET located at BBTA3. The test parameters varied are wind attack angles: 00 and 900 and wind speeds of 2 s/d 15 m/s.The bridge pylon modeling used is a pylon bridge designed by researcher with pylon on free standing condition when testing.At the angle of the wind attack 00 there is no vortex shedding that causes the VIV phenomenon because the amplitude values of the oscillations are relatively small. At the angle of wind attack 900 occurs vortex induced vibration phenomena at a speed of 4.7 s/d 5.3 m/s; 8.5 s/d 10 m/s and 12 s/d 14 m/s. The appearance of a single frequency oscillation indicates that the frequency is a vortex shedding frequency, the occurrence of oscillations with a single frequency also indicates that the occurrence of periodic forces in the rear pylon in the direction of crosswind. Opini Anda Klik untuk menuliskan opini Anda tentang koleksi ini! Lihat Sejarah Pengadaan  Konversi Metadata   Kembali

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