Analysis on three-dimensional vibration and structure-borne sound of steel box beams

• Main Authors: Bo-SiangChen, 陳泊翔
• Other Authors: Yu-Yun Lin
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/u7w493

碩士 === 國立成功大學 === 土木工程學系 === 106 === Since the steel box beams is closed, the noise may be amplified due to the internal resonance of the box beam. To investigate the low-frequency noise is caused by the vibration of the steel box beams, so this study uses the finite element ABAQUS for numerical simulation analysis to investigate the vibration behavior of the steel box beams. This paper is divided into three parts, the first part. One-dimensional beams analyze the steady-state dynamic response of concentrated and moving loads. Understand the vibration behavior when only considering the deflection of the beam. Through the frequency response function spectrum method, at different speeds, the moving load acts on the one-dimensional beam and converts to the excitation force of the fixed point. In the second part, due to the three-dimensional model, the vibration behavior of the steel plate around the box steel beam cannot be ignored. Therefore, the box steel beam is dismantled into four steel plates, and the vibration analysis was performed on the individual steel plates and the box steel beams. By comparing the natural frequencies and mode of the simulation results, we can understand the vibration behavior of the box steel beam. The inside of the box steel beam is added to the joists to increase its stiffness. Through the action of the concentrated load, we discuss the influence of the vibration behavior. In the third part, the inside of the box steel beam is added the air cavity or rockwool. We compare the natural frequencies and mode of the simulation results. In this way, we can know the vibration behavior of the interaction between structural couplings. Finally, the fixed point concentrated load is applied, and compare with the hollow box steel beam to know the effects of structural coupling.