部分充填钢管混凝土独柱墩的最小混凝土充填率

Minimum Concrete Filling Rate of Single Partially Concrete-Filled Steel Tubular Piers

钢管混凝土独柱墩具有占地面积小、承载能力高和结构耗能能力强等优点,在我国城市高架桥中得以广泛应用,但在高烈度区的应用还缺少相应的抗震设计指导。结合圆形钢管混凝土桥墩充填率的研究现状,根据《城市桥梁抗震设计规范》中提出的2种不同的抗震设计思想(减隔震设计和延性抗震设计),提出了最小混凝土充填率这个抗震设计指标,通过理论分析和实体有限元数值模拟给出相应的实用计算公式并进行验证,为促进部分充填圆形钢管混凝土桥墩在我国高烈度区的应用提供抗震设计参考。

Concrete-filled circular steel tubular(CFST)pier has been widely applied to urban viaducts in China due to its superior features of less road occupation,higher bearing capacity,and better energy-dissipation ability,yet the practical seismic design method is not available in earthquake prone areas.Considering the research status and deficiency of the concrete filling rate of circular CFST piers,the minimum concrete filling rates are proposed in this study based on different seismic design strategies(seismic isolation design or ductile seismic design)specified in the Bridge Seismic Design Code.In addition,corresponding practical formulas for the concrete filling rate are proposed and verified by theoretical study and numerical simulation,which provides specific design guidance for the seismic design of the circular CFST piers of urban viaducts in high earthquake-intensity areas.