Aerodynamic Countermeasure Schemes of Super Long-Span Suspension Bridges with Various Aspect Ratios

Abstract

The purpose of this study is to investigate the flutter control scheme of super long-span bridges with various aspect ratios (e.g. width to height (B/H)) using passive aerodynamic countermeasures. Through a series of wind tunnel testing and theoretical analysis, three types of passive aerodynamic countermeasures, i.e. vertical central stabilizer (VCS), wind barrier and inspection rail, were investigated for five typical aspect ratios of a closed-box girder bridge. The results show that both the aspect ratio and flutter critical wind speed generally increase with the decrease of the ratio of torsional and vertical frequencies of the bridge. In the case of an aspect ratio of 8.9, a downward VCS (DVCS) has a much better flutter performance than that of an upward VCS (UVCS) because aerodynamic damping of Part A and Part D could produce a higher heaving degree of freedom (DOF) participation level. Furthermore, the position variation of wind barriers is superior to their shape variation for the bridge with an aspect ratio of 8.3, and the flutter performance of the girder with a combination of the wind barrier (WB3P3) and UDVCS with 0.3[Formula: see text]h/H DVCS appears to be better than that without countermeasures. In addition, the installation of an inspection rail near the bottom point of an inclined-web (IR3) has the best flutter control effect among four positions of inspection rails.

Wind Induced Vibrations on Long Span Bridges

“…The findings contribute to the understanding and design of vibration control strategies for long-span bridges. Yang et al, [5] in this paper, the authors discuss aerodynamic countermeasure schemes for super long-span suspension bridges with different aspect ratios. They explore various strategies to mitigate the wind-induced vibrations and improve the aerodynamic performance of these bridges.…”

Effects of vertical central stabilizers on nonlinear wind-induced stabilization of a closed-box girder suspension bridge with various aspect ratios

“…On the one hand, previous studies have provided a better insight into the flutter instability of bridges with respect to only the aspect ratio [15] or only the VCS [16], but the complex nonlinear behaviors of soft flutter [17][18] and post-flutter [19][20] for closed-box girder suspension bridges under strong wind are still challenging. During the last decades, a series of nonlinear aerodynamic force models, such as band superposition model [21][22],…”

“…More and more studies have shown that the nonlinear aerostatic instability of suspension bridges was investigated both experimentally [15][16]30] and theoretically [31][32][33] in recent years. However, the influence of the combination of aspect ratios and VCS on the nonlinear aerostatic behavior of closed-box girder suspension bridges has not been fully understood.…”

Numerical Simulation of a Cable-Stayed Bridge Subjected to Ship Collision

“…To meet the increasing economic demand and improve transportation efficiency, longspan bridges have received increasing application interest [1][2][3] . Cable-stayed bridges, with merits of relatively low cost and design flexibility, are widely adopted all over the world.…”

“…Therefore, the FE model usually includes bridge piers only without considering the entire bridge model. Recently, entire bridge models were constructed to consider the superstructure interaction 1,[35][36][37][38][39] . In particular, refined FE nonlinear analysis have been conducted to study the behavior and damage assessment of ship-bridge collisions [36][37][38][39][40] .…”