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一、引言斜张桥是一种高次超静定的柔性结构,即使在正常的设计荷载作用下,当材料的应力没有超过弹性极限时,整个结构的荷载一变形关系曲线也呈现为非线性。这种非线性关系主要是由下列三个因素所引起: 1.索的垂度; 2.梁—柱效应; 3.由于大跨斜张桥的主梁和索的相对纤细,引起整个结构在外荷载作用下产生较大
I. INTRODUCTION Diagonal bridge is a high-order statically indeterminate flexible structure. Even under the normal design load, when the stress of the material does not exceed the elastic limit, the load-deformation curve of the whole structure also appears nonlinear . This nonlinear relationship is mainly caused by the following three factors: 1. Cable sag; 2. Beam-column effect; 3. Due to the relatively thin girder and cable of a large spanned bridge, the entire structure is exposed Generate larger loads