This test involves constructing a rigid model of a representative cross-section of a bridge structure that exhibits strong two-dimensional characteristics—such as a stiffening girder, cable, or chimney—and assessing its aerodynamic performance. Among various testing methods, the section model test is considered the most basic, essential, and cost-effective approach for evaluating the wind-induced stability of bridges.

​Section model testing includes several methodologies:

▣ Free Vibration Test: Conducted using a spring support system while simulating the dynamic characteristics of the prototype structure.
▣ Aerodynamic Force Test: Utilizes a three-component load cell to measure aerodynamic force coefficients such as drag, lift, and moment.
▣ Forced Vibration Test: A specialized setup induces dynamic responses in the model to capture unsteady aerodynamic forces acting on the structure.

Through these tests, key aspects of aerodynamic stability can be evaluated, and decisions can be made regarding the implementation of aerodynamic countermeasures such as fairings or flaps.
 
▣ Aerodynamic stability: Vortex-induced vibration, flutter, and galloping
▣ Wind force of bridge deck: Drag, lift, and moment coefficients
▣ Heaving, pitching, and sway modes
▣ Aerodynamic optimization of the girder shape to increase aerodynamic stability and to decrease static deformation due to wind