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1.充填型钢管混凝土结构在钢管结构中充填混凝土后,除了刚度增大之外,还能使压缩强度和弯曲强度增大。由于内填混凝土能约束钢管内侧的压屈变形,所以作为评价抗震性能的塑性变形能力也获得了有效的提高。本文介绍的设计实例是一个采用充填型方形钢管混凝土梁柱的钢结构建筑物。该工程在设计时考虑施工等情况,将充填混凝土所提高的强度作为潜在的安全系数来处理,又因为在新的抗震设计方法中,指出对FB类别宽厚比的钢管柱按照FA类别评价,所以也考虑了充填混凝土的局部刚度加强效果。
1. Filled concrete-filled steel tube structure After the concrete is filled in the steel pipe structure, in addition to the increase in stiffness, the compressive strength and bending strength can be increased. Since the infill concrete can restrain the buckling and deformation of the inner side of the steel pipe, the plastic deformation ability as an evaluation of the seismic performance has also been effectively improved. The design example presented in this paper is a steel structure building using filled square steel tube concrete columns. The project considers the construction and other conditions during the design process, and treats the strength of the filled concrete as a potential safety factor. In addition, because of the new seismic design method, it is pointed out that the steel pipe columns with the aspect ratio of the FB type are evaluated according to the FA category. Also consider the local stiffness enhancement effect of filled concrete.