钢管混凝土在美国桥梁下部结构中的应用

Application of Concrete-Filled Steel Tubular in American Bridge Substructure

钢管混凝土作为一种组合结构,因其良好的技术与经济性被许多国家采用,特别是亚洲地区国家,如中国、日本应用较为广泛。钢管混凝土结构节点连接构造复杂,施工时耗时耗力,缺乏相关的设计标准,在欧美等地区应用相对较少。美国的设计规范主要针对钢结构和钢筋混凝土结构,缺乏钢混组合结构相关的设计标准,而且在美国钢管混凝土构件使用的钢管宽厚比值较小,多应用于美国高层建筑中,在桥梁建设中的应用非常有限。美国桥梁技术人员分别从构件受力、规范设计、节点连接等方面展开研究工作,以推广应用钢管混凝土结构。

as a composite structure, concrete-filled steel tube is widely used in many countries for its good technical and eco- nomic characteristics, especially in Asian countries, such as China and Japan. The joint structure of the concrete-filled steel tube joints is complex, and it takes a lot of time and labor to construct. It lacks relevant design standards and is relatively rare in Europe, America and other regions. Design specifications in the United States mainly focus on steel structures and reinforced concrete structures, lacking design standards related to steel and concrete composite structures. The ratio of width to thickness of steel tubes used in concrete-filled steel tube members in the United States is relatively small, and they are often used in high-rise buildings in the United States. However, their application in bridge construction is very limited. Bridge technicians the United States began their research work from the aspects of structural stress, standard design, and joint connections to promote the application of concrete-filled steel tubular structures.