自密实混凝土桥墩抗震性能试验研究  

Experimental Study on Seismic Behavior of Self-Compacting Concrete Columns

作　　者：张霁颜 逯宗典[2] 段洪亮 肖纬 王志强[1] Zhang Jiyan;Lu Zongdian;Duan Hongliang;Xiao Wei;Wang Zhiqiang(Bridge Engineering Department of Tongji University,Shanghai 200092,China;CCCC Second Highway Survey and Design Institute Co.,Ltd.,Wuhan 430000,China;Tongji Architectural Design(Group)Co.,Ltd.,Shanghai 200092,China;Shanghai Municipal Engineering Design Institute(Group)Co.,Ltd.,Shanghai 200092,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]中交第二公路勘察设计研究院有限公司,湖北武汉430000 [3]同济大学建筑设计研究院(集团)有限公司,上海200092 [4]上海市政工程设计研究总院(集团)有限公司,上海200092

出　　处：《石家庄铁道大学学报（自然科学版）》2020年第4期10-17,43,共9页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：国家自然科学基金面上项目(51778470);国家自然科学基金面上项目(51378386)。

摘　　要：通过两阶段的试验研究了自密实混凝土桥墩的抗震性能。第一阶段试验为10组混凝土与钢筋的拉拔试验,分析了各个试件的破坏形式并将自密实混凝土与钢筋之间的粘结锚固性能与同等强度普通混凝土进行了对比。第二阶段试验为自密实混凝土桥墩抗震性能拟静力试验,研究了桥墩试件的破坏模式和滞回环,以及漂移比、位移延性、等效粘滞阻尼比、等效刚度和残余变形等5项抗震性能指标。试验结果表明:与普通混凝土试件相比,钢筋与自密实混凝土试件间的粘结性能偏弱,但随着锚固长度的增加,两者的差异逐渐减小;2个拟静力试验桥墩试件破坏形式均表现为弯曲破坏,与自密实混凝土桥墩试件相比,普通混凝土桥墩试件在整个试验过程中具有相对饱满的滞回环和较缓的强度退化;自密实混凝土桥墩试件表现出相对较弱的延性能力和耗能能力。In this paper,a two-stage test was conducted to study the seismic behavior of self-compacting concrete piers.The first stage of it consisted of 10 groups of pull-out tests of concrete and rebars.The failure forms of each specimen were analyzed and the bonding anchorage performance between self-compacting concrete and steel bars was compared with that of ordinary concrete of the same strength.The second stage test was a quasi-static test of seismic behavior of self-compacting concrete piers,studying the failure modes and hysteretic ring of the pier specimens,and the seismic performance of the specimens were evaluated by five indexes,including drift ratio,displacement ductility,equivalent viscous damping ratio,equivalent stiffness and residual deformation.The results showed that the bond property between rebars and self-compacting concrete was weaker compared with ordinary concrete,but with the increase of anchorage length,the difference between the two decreased gradually.The failure forms of the two quasi-static test pier specimens were both bending failures.Compared with the self-compacting concrete specimen,the ordinary concrete specimen had relatively plumper hysteretic ring and slower strength degradation during the whole test.And the self-compacting concrete specimen showed relatively weaker ductility and energy dissipation.

关 键 词：自密实混凝土 抗震性能 粘结锚固性能 拟静力试验 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]