摘要
为利用截面设计参数定量计算钢管混凝土组合桥墩抗震延性,选择矩形桥墩作为研究对象,鉴于我国桥墩服役期工作轴压比一般处在0.1~0.4的现状,选择此区间作为研究范围,根据平截面假定、力的平衡和材料本构关系,分别建立了截面屈服曲率和极限曲率关于截面设计参数的解析公式,并通过数值方法验证了解析公式的正确性。将截面极限曲率与屈服曲率之比即曲率延性系数作为评价指标,最终建立评价指标关于截面设计参数的解析公式。研究结果表明:利用推导的解析公式可以实现对钢管混凝土组合桥墩曲率延性系数的定量计算,结果可信;通过曲率延性系数的比较,证明在耗材相同的情况下,钢管混凝土组合桥墩比箍筋约束混凝土桥墩具有更好的抗震延性。
This paper researches rectangular piers to quantitatively evaluate the seismic ductility of concrete-filled steel tube composite piers for various cross-section design parameters. Because the axial load ratio of most piers was in the range 0.1- 0.4 during the service period, this range of axial load ratios was chosen for the research. Using the flat-section assumption and the force balance and material constitutive relations, the yield curvature and limit curva- ture of the section were obtained analytically from the design parameters. The analytic results for the yield curvature and ultimate curvature were verified by a numerical method. The ratio of limit curvature to yield curvature was defined as a curvature ductility factor that was treated as an evaluation index that allowed the factor to be calculated when the cross-section design parameters were known. The results show that the analytical formula for the curvature ductility factor is feasible and credible. By comparing curvature ductility factors, the conclusion is reached that, for the same assumptions, concrete-filled steel tube composite piers have better seismic ductility than confined concrete piers with stirrups.
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2016年第5期672-677,共6页
Journal of Harbin Engineering University
基金
国家科技支撑计划资助项目(2011BAJ09B02)
江苏省"六大人才高峰"第十一批资助项目(JZ-007)
江苏高校优势学科建设工程资助项目(CE02-1-4)
关键词
桥梁工程
桥墩
钢管核心混凝土
抗震延性
定量计算
bridge engineering
pier
concrete-filled steel tube
seismic ductility
quantitative calculation