Jiawu Li

Chang'an University · bridge engineering

The post-flutter bifurcation behavior of a twin-box bridge deck was investigated through a series of elastically-supported section model tests. The experimental results suggested that the bridge deck will undergo limit cycle oscillations in post-flutter states via both subcritical and supercritical Hopf bifurcations due to aerodynamic nonlinearitie...

In the preliminary design stage of long-span bridges, there are many bridge deck schemes that need to check flutter stability through wind tunnel tests, and therefore it will take a lot of time and money. So, the authors are committed to investigating a way to quickly predict the flutter critical wind speed (FCWS) of bridge decks, and then select t...

Due to the spatial differences in wind fields in mountainous areas, it is an urgent problem to accurately estimate the buffeting response of long-span bridges in mountainous areas. In this paper, the spanwise variations in the mean and fluctuating wind characteristics of a bridge site are obtained based on a terrain wind tunnel test of a trumpet-sh...

Long-span bridges are susceptible to vortex-induced vibration (VIV) and flutter in different reduced wind range. Currently, VIV and flutter are considered as two different types of wind-induced vibration and different empirical models were proposed. The possibility of building a universal empirical model for both torsional VIV and nonlinear flutter...

This paper aims to propose a novel model for predicting the nonlinear heave-torsion coupled flutter instability of flat bridge decks. The nonlinear oscillatory system during coupled post-flutter instabilities was modeled as a weak perturbation of the classical linear flutter theory. A novel nonlinear self-excited force model was then proposed by in...

The transverse aerodynamic instabilities of rectangular cylinders with three typical side ratios (width-to-depth-ratio as 2:1, 1:1 and 1:2) were investigated through a series of elastically-supported sectional model tests. Experimental results indicate that side ratio plays an important role in the phenomena of transverse instabilities and a larger...

The nonlinear aeroelastic behavior of a typical bluff bridge section, i.e., open twin-side-girder bridge deck, was investigated through a series of spring-suspended sectional model (SSSM) tests in the post-flutter state. When the reduced wind speed exceeded linear aeroelastic limits, the sectional model underwent significant limit cycle oscillation...