چكيده به لاتين
The daily increase in the length of the bridge span reduces the rigidity and stiffness of the bridges. This causes bridges to become more sensitive to the impact of the wind and the resulting effects. Therefore, in this research, we investigate the influences of effective flows on the bridge's instability and provide a model for calculating the behavior of cable- Stayed bridges.
The aerodynamic science and interaction between structure and flow will also play an important role. The aerodynamics is a branch of the dynamics of gases and, in general, fluid dynamics, which investigates the behavior of the airflow and its effect on moving objects. The solution to an aerodynamic problem is to calculate the velocity field, the pressure, and the temperature of the air around an object. For this purpose, we must solve the governing equations for fluid flow. Then, with the help of the solution, one can calculate the force and momentum that enters the body.
The nature of wind forces can be due to pressure fluctuations (turbulences) in
the oncoming flow, the vortices on the surface and in the wake of the body, and from the interaction between the flow and the oscillating body itself. The first of these effects is known as buffering, the second as vortex shedding, and the third is usually labeled motion induced force.
This research checks the factors influencing the turbulent flow and behavior that will be on the deck of the bridge. Also, we will compare the results obtained from modeling the interaction between flow-structure and the effect of aerodynamic behavior on the bridge with the values of the regulation.
Keywords:
Aerodynamics, impact load, turbulent flow, vortex flow, flow-structure interaction
