Dynamic Instability of Truss-Stiffened Suspension Bridges under Wind Action

An attempt is made in this paper to approach by rational analysis the problem of self-excitation of vibrations in suspension bridges. A mathematical solution of the problem of aerodynamic instability of truss-stiffened suspension bridges under wind action, which likewise applies to suspension bridges with extremely shallow stiffening girders, is presented herein. The theory leads to the explanation of the mechanism of catastrophic self-excitation in trm;s-type bridges, and ultimately to a rational method of bridge design against wind in order to assume aerodynamic stability.