Vibration Analysis for Pendent Pedestrian Path of a Long-Span Extradosed Bridge

Abstract

Pendent pedestrian path is a new structure form in long-span city bridges to satisfy vehicle passing demand and pedestrian passing demand simultaneously. For such design form, besides the traditional comfort problem caused by pedestrians, the vibration induced by upper passing vehicles and oncoming turbulent wind also cannot be ignored. In this research, the vibration characteristics of the pendent pedestrian path induced by pedestrians, upper vehicles, and turbulent wind are all investigated based on a designed long-span extradosed bridge. The results show that the design of the pedestrian path could satisfy the comfort demands comprehensively regardless of the local magnification effects of pedestrian path vibration. Reducing the spacing of the supported beam is meaningful for suppressing the local vibration effects. The road roughness of the upper pavement has significant effects on the maximum acceleration of pedestrian paths while the influence of the vehicle speed is relatively limited. An approximate quadratic relationship is observed between the buffeting-induced acceleration and the oncoming wind speed. Thus, the pedestrian path should be closed during strong winds.

An Analytical Solution for Unsteady Aerodynamic Forces on Streamlined Box Girders with Coupled Vibration

“…where ζ u is the complex conjugate of ζ u . Introducing z = f (ζ) and Equation (10) into Equation ( 9) leads to:…”

“…The analysis of unsteady aerodynamic forces and vibrations has been a subject of significant interest in the field of engineering [3][4][5], particularly in the design and analysis of streamlined box girder (SBG) bridges. The increasing demand for long-span bridges makes the bridge structure increasingly sensitive to the wind load [6,7], which can result in remarkable structural vibrations [8][9][10] and even the collapse of the bridge [11]. The potential flow theory can provide a useful framework for understanding the basic principles of fluid flow and the resulting forces on structures.…”

Modal Analysis of Beam Structures with Random Field Models at Multiple Scales

“…Despite the changeable nature of dynamic loads, modal parameters keep constant and are independent of the types and ranges of the external dynamic loads [5]. Modal analysis aims at determining the modal parameters of a structure and hence has become an essential task for a wide range of applications, such as serviceability analysis [6], vibration control [7,8], load estimation [9], structural damage identification [10,11], and structural health monitoring [12,13].…”

Study on the Comfort of Pedestrians on Landscape Footpath Paved on the Suspension Monorail System

“…Apart from the pedestrian loads, the pedestrian bridge integrated in the complex traffic system may receive other external excitations, which might have impacts on the pedestrian comfort level. Responses of the pedestrian bridge under vehicle-induced excitation were analyzed by some researchers, and the effects of the roughness of road surface, vehicle speed, and traffic flow on the responses were discussed as well [12,13].…”