钢筋混凝土圆形桥墩的延性分析  

Ductility Analysis of Circular RC Piers

作　　者：陈旭[1] 周东华[2] 徐从发[1] 莫南明[1] 杨光华[1] 

机构地区：[1]昆明学院城乡建设与工程管理学院,云南昆明650214 [2]昆明理工大学建筑工程学院,云南昆明650504

出　　处：《公路工程》2018年第1期47-52,80,共7页Highway Engineering

基　　金：国家自然科学基金资助项目(51668027;51468026);云南省教育厅科学研究基金项目(2017zzx089)

摘　　要：构件的延性可由截面的弹塑性弯矩-曲率关系曲线来反映。弯矩-曲率曲线上的点与截面应变之间存在一一对应关系。对曲线上的应变变化过程进行分析,给出曲线初始应变计算的解析式。考虑轴力由拉到压的全部范围,对轴力、弯矩、曲率、应变和曲率延性系数进行参数分析。按照轴力水平的不同,弯矩-曲率关系曲线的表现可分为3种类型,即拉力、小纵向压力和大纵向压力。在拉力和小纵向压力作用下,延性较好。在大纵向压力作用下,延性显著变差。Member ductility can be represented by the plastic-elastic moment-curvature curves of the cross-section. A one-to-one corresponding relationship is existed between the point on the momentcurvature curve and sectional strain,the change process of strain on the curve was analysed,and the analytical expressions of calculating the initial strain on the curve were obtained. Considering the whole axial forces from tension to compression,parameter analysis was conducted for the relationships of axial force,moment,curvature,strain and curvature ductility factor. According to the different axial force levels,the behaviour of the moment-curvature curves can be classified into three types,namely,tension,small compression and large compression. Ductility is preferable under tension and small compression and becomes dramatically bad under large compression.

关 键 词：桥墩 弹塑性 弯矩-曲率曲线 曲率延性系数 应变 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]