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Analysis of Vibration Disease on a Long-Span X Arch Footbridge and Reinforcement

Author: ZhaoYinFei
Tutor: HuangQiao
School: Harbin Institute of Technology
Course: Bridge and Tunnel Engineering
Keywords: Footbridge Basket-style arch bridge Human -induced vibration Disease Analysis Reinforcement
CLC: U445.7
Type: Master's thesis
Year: 2007
Downloads: 91
Quote: 1
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Abstract


In recent years, the design of the pedestrian bridge more lightweight high-strength materials and novel aesthetic structure, the design of the pedestrian bridge to \Bridge becomes slender, light, resulting in structural natural frequency smaller loads of people mobility sensitive. Many people footbridge natural frequencies between pedestrian stride frequency range and, therefore, they may produce excessive vibration loads of human mobility. Recent years footbridge vibration usability problems have caused widespread concern. Induced vibration problem in order to analyze the footbridge, the article describes the pace of pedestrian loading models, forced resonance theory and vibration comfort evaluation method. Because of the lack of research in this area, so the article reference contrast the normative values ??of other countries, to provide a reference for our current design of the dynamic performance of the footbridge. There are two basic approaches in the design of the pedestrian bridge, frequency adjustment method and dynamic response history analysis method, which is more reasonable. When the bridge baseband or low-level frequency in the the pedestrian pace frequency range (vertical 1.4 to 2.4Hz, lateral 0.7 ~ 1.2Hz) must be dynamic response analysis and requirements pedestrian vibration comfort evaluation. Jilin City, Rainbow Bridge, for example the analysis of the mechanical properties of the basket handle arch bridge, its detection, evaluation, and analysis of vibration disease, pedestrian vibration comfort evaluation Finally reinforcement design. Provides a methodological reference for the future this type of bridge inspection, assessment and reinforcement. Meanwhile, in the analysis process has been the outcome of several important conclusions. Rigid arch rib basket in flexible type of deck system supporting pedestrian arch bridge is often diseases deck system first appeared. Flexible bridge deck system dynamic performance is poor, in the pedestrian pace loads excessive vibration, may even people bridges resonance occurs. Natural vibration characteristics of the Rainbow Bridge, I believe that the basket arch bridge earlier order vertical natural frequency is mainly determined by the Rib performance, high-end vertical frequency is mainly determined by deck system performance, increase the stiffness of the bridge deck system can not effective the staggered pedestrian stride frequency and structure of vertical natural frequency, but can effectively weakened the dynamic response, and improve the performance and safety of the use of the bridge. The dynamic response analysis footbridge vibration disease analysis and comparative analysis of the dynamic performance before and after reinforcement. Increasing the stiffness of the bridge deck system may often not be implemented because of the cost and aesthetic reasons. Combat pedestrian bridge vibration disease, often need to increase the damping of the bridge can be resolved through additional damper.

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CLC: > Transportation > Road transport > Bridges and Culverts > Bridge Construction > Bridge maintenance, repair and remediation
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