摘要
为探究特大跨轨道连续刚构桥钢-混结合段在循环荷载作用下的性能演化规律,设计结合段局部1∶2缩尺模型,分别按照设计状态和极限状态施加循环荷载。研究表明:设计荷载循环作用下,每次加载应力-荷载曲线都能够基本重合,且都呈线性关系,说明设计荷载循环作用下结合段的性能基本没有退化。极限荷载循环作用下,每次加载界面粘接均有一定退化,在第6次加载中开裂处混凝土脱空,界面粘接退化严重。前5次加载前段刚度退化不明显,在第6次加载至3300 kN时,已经退化严重。该文通过对结合段的界面滑移量以及位移量进行分析,研究界面粘接退化以及整体刚度退化,对认识特大跨轨道专用钢-混结合段在偶然极端荷载(如严重超载、地震荷载等)作用下的性能退化规律有很大的参考价值。
In order to explore the evolution of the performance of the steel-concrete joint section of the super long-span track continuous rigid frame bridge under cyclic loading,a local 1∶2 scale model of the joint section was designed,and cyclic loads were applied according to the design state and the limit state.The study shows that under the design load cycle,the stress-load curve of each load can basically overlap and become a linear relationship,which shows that the performance of the joint section under the design load cycle is basically not degraded.Under the action of the ultimate load cycle,the interface bonding degrades to a certain extent at each load.In the sixth load,the cracked concrete is voided,and the interface bonding degrades seriously.The stiffness of the front section of the first 5 loadings is not significantly degraded,and when it is loaded to 3300 kN for the 6th time,it has been seriously degraded.This paper analyzes the interface slip and displacement of the joint section to study the degradation of interface bonding and the degradation of overall stiffness.It has great reference value for understanding the performance degradation law of the special steel-concrete joint section of the super long-span track under accidental extreme loads(such as severe overload,seismic load,etc.).
作者
谢开兵
龚顺燧
马虎
邹杨
周建庭
XIE Kaibing;GONG Shunsui;MA Hu;ZOU Yang;ZHOU Jianting(State Key Laboratory of Mountain Bridge and Tunel Engineering,Chongqing 400074,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Chongqing Rail Transit(Group)Co.,Ltd.,Chongqing 401120,China)
出处
《中国测试》
CAS
北大核心
2023年第5期171-180,共10页
China Measurement & Test
基金
国家自然科学基金(U20A20314)
重庆市自然科学基金(cstc2019jcyj-cxttX0004,cstc2018jscx-mszdX0084)。
关键词
循环作用
结合段
设计荷载
极限荷载
性能退化
cyclic action
joint section
design load
ultimate load
performance degradation
