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"studi untuk mengetahui pengaruh perubahan variasi parameter lead rubber bearing (lrb) base isolator pada pondasi bangunan nuklir cyclotron telah dilakukan. desain bangunan nuklir cyclotron harus mampu menahan beban gempa tanpa mengalami kerusakan. bangunan nuklir cyclotron selain berfungsi sebagai bangunan struktur juga berfungsi sebagai shielding radiasi sehingga ketahanan terhadap gaya dari luar dalam hal ini gempa harus ditingkatkan. solusi yang bisa dipakai meningkatkan ketahanan bangunan terhadap beban gempa adalah pengunaan base isolator tipe lead rubber bearing (lrb) pada pondasi. analisis numerik telah dilakukan dengan melakukan perubahan variasi parameter dalam hal ini tebal lapisan karet, tebal plat steel dan diameter inti lead untuk melihat pengaruhnya terhadap kekakuan horizontal, kekakuan vertikal serta nilai damping dari isolasi lrb. dilanjutkan dengan analisi dinamik untuk mengetahui effektivitas penggunaan sistem base isolator lrb. hasil penelitian diperoleh bahwa perubahan diameter inti lead, tebal lapisan karet dan tebal plat steel akan mempengaruhi nilai transmibilitas gaya yang diteruskan dari beban gempa ke bangunan dan penggunaan lrb meningkatkan periode getaran bangunan atau dengan cara menurunkan frekuensi natural. hal ini meningkatkan rasio frekuensi yang akan membuat rasio respon pembesaran getaran bangunan menjadi sangat kecil. analisis numerik menggunakan fem abaqus dan solidwork mengungkapkan bahwa penggunaan lrb membuat respon getaran bangunan nuklir cyclotron akibat beban gempa mengalami beban yang kecil baik dalam pergerakan lateral bangunan maupun percepatannya.

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a study to determine the effect of changes in the variation of lead rubber bearing (lrb) base isolator parameters on the cyclotron nuclear building foundation has been conducted. cyclotron nuclear building design must be able to withstand earthquake loads without experiencing damage. cyclotron nuclear buildings in addition to functioning as structural buildings also function as radiation shielding so that resistance to external forces in this case the earthquake must be increased. the solution that can be used to increase building resistance to earthquake loads is the use of lead rubber bearing (lrb) type base isolators on the foundation. numerical analysis has been done by changing the parameter variations in this case the thickness of the rubber layer, thickness of the steel plate and the core diameter of the lead to see its effect on horizontal stiffness, vertical stiffness and damping value of lrb isolation. followed by dynamic analysis to determine the effectiveness of the use of lrb base isolator systems.

results of the study was found that changes in lead core diameter, thickness of rubber layer and thickness of steel plate will affect the value of force transmittance transmitted from earthquake loads to buildings and the use of lrb increases the period of building vibration or by decreasing natural frequency.this increases the frequency ratio which will make the buildings vibration-response response ratio very small. numerical analysis using fem abaqus and solidwork revealed that the use of lrb made the vibrational response of the cyclotron nuclear building due to the earthquake load experience a small burden both in the lateral movement of the building and its acceleration."

"The magnet is one of the main components of a cyclotron, used to form a circular particle beam trajectories and to provide focusing of the beam. To support the mastery of 13-MeV proton cyclotron technologies, cyclotron magnet design must be done to satisfy cyclotron magnet requirements. This research was conducted by studying important parameters in designing the cyclotron magnet which is then used to determine the design requirements. The magnet design was based on the results of a 3D simulation using Opera 3D software. Opera 3D is a software developed by Cobham plc to solve physical problems in 3D such as magnetostatic using finite element methods. The simulation started by drawing a 3D model of the magnet using a modeler, followed by magnetic field calculations by Tosca module in the Opera 3D software. Simulation results were analyzed with the Genspeo software to determine whether the parameters of the cyclotron magnet have met design requirements. The results indicate that the magnet design satisfied the cyclotron magnet design requirement, that B in the median plane of the magnetic pole approached the isochronous curve, providing axial and radial focusing beam, crossing the resonance line at vr = 1 when the particle energy is low and the particle energy is more than 13 MeV, and lead to small enough phase shift of about 13°. The dimension of the cyclotron magnet is 1.96 m × 1.30 m × 1.21 m; its weight is 17.3 ton; its coil current is 88,024 ampere-turn; its center magnetic field is 1.27479 T; its maximum magnetic field is 1.942116 T; its minimum magnetic field is 0.7689 T; its valley gap is 120 mm; its hill gaps are 40 to 50.78 mm; and its hill angles are 35° to 44°.to 44°"