ABSTRACT
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The construction of rapid urban viaduct network plays a significant role in alleviating the congestion of transportation for Chinese metropolitan regions. Accompanied with that, all types of sound barriers are erected to reduce vehicle noise for environmental concern in the vicinity. However, due to the space limitations, most viaducts in lack of emergency parking strip, and thus the fast-running vehicles are closer to sound barriers, especially for the motor coach vehicles with large size bodies, which makes the problem related to vehicle-induced disturbance wind effect on sound barriers becoming increasingly prominent. Consequently, metal frame sound barriers often suffer from vibrations on the barrier bodies, and premature fatigue damage on the connecting and anchoring components, since that only natural wind load is considered as the key load action in structural design. One of the reasons lies in shortage of knowledge about running vehicle induced wind effect on sound barrier, and the relative international design codes, such as AASHTO, BS5400 and Eurocode, are not suitable for this type of sound barrier design.
Therefore, a serial research work is carried out to demonstrate running vehicles induced disturbance wind load and its effect on sound barrier, in order to set up a proper structural design method. The main goal of this paper is to discuss the proper structural design method of sound barrier on rapid urban via-duct, through analysis of the vibration response characteristics of metal frame sound barrier with H-shape steel column under wind load induced by running motor coach. First, disturbance wind pressure time-history curves act on screen body is generated by data from both field testing and numerical simulation. Second, some typical extreme disturbance wind load action patterns are presented corresponding to sound barriers set on both side and central barrier wall, and compared natural wind load is also considered. Third, vibration response characteristics of sound barrier, such as displacement, acceleration, and stress, are obtained through FEA of time-domain method and data analysis. Finally, structural design loads suitable for sound barrier on rapid urban viaduct is investigated by comparison with some relative indexes given in design specification, and the anti-fatigue design method is suggested. Displacement contours with vehicle nose passing by different columns. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315207681/cd556cd4-4dcf-4efe-8e29-56fc67b8bfbd/content/fig326_1.tif"/>
