中空型外壁钢板-混凝土组合桥塔塔柱承载力研究

以某跨海大桥原型设计提出的一种新型中空型外壁钢板-混凝土组合桥塔塔柱为背景，设计制作了4个中空型外壁钢板-混凝土组合塔柱试件。通过轴心受压试验，研究中空型外壁钢板-混凝土组合桥塔塔柱破坏过程，并分析混凝土强度、钢板厚度、连接件型式等参数对试件轴压性能的影响。采用ABAQUS软件进行有限元模拟，分析不同结构型式和设计参数(混凝土强度、钢板强度和钢板厚度)对组合塔柱受力性能的影响。研究表明：中空型外壁钢板-混凝土组合塔柱具有优异的承载能力和延性，其承载能力和延性与内外壁钢板-混凝土组合塔柱相当，明显优于普通钢筋混凝土柱；提高混凝土强度、钢板强度和增加钢板厚度均能够提高组合塔柱承载力，但对结构刚度提高不明显。研究成果可为大跨桥梁设计提供参考。

Research on the bearing capacity of hollow concrete-filled steel exterior wall composite bridge tower column

Based on the prototype of a new type of hollow concrete-filled steel exterior wall composite bridge tower, four hollow concrete-filled steel exterior wall composite column specimens were prepared. According to axial compression tests, the failure patterns of the specimens were investigated, and the influences of concrete strength, thickness of steel plate, connector type on the performance of composite tower column were analyzed. By using the commercial software ABAQUS, the influences of structure type and design parameters (such as concrete strength, strength of steel plate and thickness of steel plate) on the performance of composite tower column were studied. The results show that, the hollow concrete-filled steel exterior wall composite bridge tower has excellent bearing capacity and ductility, close to those of the hollow concrete-filled steel interior-exterior wall composite tower column, but evidently superior to the ordinary reinforced concrete columns; the strategies of increasing the strength of concrete, the strength and thickness of steel plate can be employed to improve the bearing capacity of the composite tower column, but the improvement of structural stiffness may not be increased obviously. The research results can be referred by the design of long-span bridges.