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鉴于锚箱结构体系及其受力特性的复杂性,以苏通大桥锚箱式索梁锚固结构为研究对象,采用理论研究与模型试验相结合的研究方法,对于锚箱式索梁锚固结构的传力途径、传力机理及其关键影响因素等相关关键问题进行系统研究。研究表明:斜拉索索力作用下锚箱式索梁锚固结构体系受剪力和弯矩的联合作用,并通过锚箱关键受力板件与钢箱梁腹板间的焊缝实现荷载传递,这一受力特性决定了锚箱结构的力学行为特性;由锚箱结构体系的复杂性所决定,不同的设计参数组合将导致其力学特性出现显著差异;锚箱顶底板与钢箱梁腹板的焊缝长度是影响其传力机理的关键因素;各关键影响因素对于锚箱结构力学行为特性的影响具有耦合性,对锚箱结构的传力机理进行系统研究是确定其关键设计参数从而实现其合理结构设计的基本前提。
In view of the complexity of anchoring box structure system and its stress characteristics, the anchor box girder anchorage structure of Sutong Bridge is taken as the research object. By the combination of theoretical research and model test, Force transmission mechanism, force transmission mechanism and its key influence factors and other related key issues systematically. The research shows that under the action of stay cables, the combined action of shear force and bending moment of anchor box girder anchoring structure system can achieve the load transfer through the weld between the key bearing plate of anchor box and the web of steel box girder, The mechanical properties of anchor box structure determine the mechanical behavior of the anchor box structure by the complexity of the decision, the combination of different design parameters will result in significant differences in their mechanical properties; anchor box roof and steel box girder web Of the weld length is the key factor affecting the transmission mechanism of the key factors affecting the mechanical properties of the anchor box structure has a coupling effect on the transmission mechanism of the anchor box system is to determine the key design parameters in order to achieve The basic premise of its rational structure design.