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对两铰圆弧形钢管桁架拱的弹性及弹塑性失稳机理及承载性能进行了深入研究,考虑了全跨和半跨水平均布荷载、跨中及1/4跨集中荷载等多种类型的荷载效应。分析了钢管桁架拱在不同荷载作用下的失稳破坏机理,指出其会发生整体失稳、弦杆局部失稳、腹杆局部失稳以及局部与整体的相关失稳等多种破坏模式。考察了矢跨比、腹杆尺寸、腹杆夹角和截面宽高比等不同参数对钢管桁架拱稳定承载力的影响,为桁架拱稳定设计方法的建立奠定了重要基础。
The elastic, elasto-plastic buckling mechanism and bearing capacity of the two-arch circular arc tubular truss arch bridge are studied in detail. Considering the horizontal and half-span horizontal uniform load, mid-span and ¼ span concentrated load, The load effect. The failure mechanism of the steel tube truss arch under different loads is analyzed. It is pointed out that there are many failure modes such as global instability, local chord instability, local instability of the web, and local and overall instability. The influence of different parameters such as ratio of span, web, web angle and aspect ratio on the stability bearing capacity of steel truss arch was investigated, which laid an important foundation for the establishment of truss arch stability design method.