为此,本文以作者过去提出的桁梁桥挠曲扭转理论为基础,演引出侧倾失稳微分方程,并对单跨简支的情况求得了近似解析解,用以计算拟建的桁梁桥的侧倾稳定安全度。

• First, basing on the theory of bending and torsion of truss bri-dge proposed formerly by the author, differential equations of the lateralbuckling of the truss are established,then, approximate analytical solution fora single span truss bridge is worked out to determine the critical load oflateral buckling, and thereupon the reliability over buckling is studied.