Series method for analyzing 3D nonlinear torsional divergence of suspension bridges

✍ Scribed by Jin Cheng; Jian-Jing Jiang; Ru-Cheng Xiao; Hai-Fan Xiang

• Book ID: 104268383
• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 277 KB
• Volume: 81
• Category: Article
• ISSN: 0045-7949
• DOI: 10.1016/s0045-7949(02)00446-7

✦ Synopsis

A simplified method for analyzing 3D nonlinear torsional divergence of suspension bridges is proposed in this paper. The geometric nonlinearity in the deflection theory and the three components of displacement-dependent wind loads are taken into account in the method. This method is a two-step process: the calculation of deflection response under the displacement-dependent wind loads, and the calculation of the critical wind velocity. The response under the displacement-dependent wind loads is calculated from Fourier series. The critical wind velocity is calculated by means of an iterative method. It is found that a small number of iteration cycles and Fourier coefficients are sufficient enough for convergence. The advantages of the proposed method are showed by a comparing the numerical results of this method with those obtained from the linear method and nonlinear finite element methods.