Dynamic Response of Moving Vehicle and Multi-Span Continuous Bridge with An Irregular Surface

• Main Authors: Chin-Tang Lin, 林錦堂
• Other Authors: Sen-Lin Lu
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/75938298904601214190

碩士 === 國立臺灣科技大學 === 機械工程系 === 92 === Abstract This aim of this thesis is to study the dynamic response of the vehicle and the multi-span bridge with irregular surfaces. The vehicle body is modeled as an elastic flexible beam and the bridge is modeled as multi-span continuous elastic flexible beam. The bridge is considered to be a finite length, uniform cross-section beam with an uneven profile, which can be simulated as a random process. Three types of road profiles, such as white noise process, Markov process and the ergodic stationary Gaussian zero mean process, will be discussed in the study. The modal superposition method is used to formulate the equation of motion for the coupled vehicle-bridge system. Accordingly, this equation can be rewritten as a state equation. Finally, the mean value and variance of displacement of the structural system is solved by using the proposed recursive algorithm. The numerical results are compared with those using the Monte Carlo simulation approximation. Examples are presented to study the dynamic deflections with the suspension damping, bridge length and the vehicle velocity respectively, as a parameter.