摘要
为研究撞击荷载下灌浆套筒连接装配式混凝土(Precast Concrete,PC)柱的力学性能和损伤机理,采用数值仿真技术建立了PC柱精细有限元模型,并完成了模拟方法的验证,分析了PC柱的撞击响应特征与传统现浇混凝土(Cast⁃in⁃Place Concrete,CIPC)柱的差异,讨论了撞击位置、轴压力、接缝强度和套筒连接强度等参数对PC柱抗撞性能的影响,并从曲率分布的角度分析了PC柱的损伤特性。结果表明:相同撞击条件下PC柱和CIPC柱的非线性力学行为比较接近,但两者柱底的传力机制和破坏形态差异明显;曲率分布能直观描述PC柱的损伤细节特征;撞击位置的变化会改变PC柱的抗力机制,而轴压比在一定程度上可提高PC柱抗撞能力;由于撞击荷载的局部效应显著,接缝强度和套筒连接强度主要影响接缝附近柱体的损伤机理。
To numerically investigate the mechanical properties and damage mechanism of precast concrete(PC)columns with grouted sleeve connection subjected to impact loadings,the refined finite element model of PC column under lateral impact was es⁃tablished and verified against previous impact test results.The differences between the impact response characteristics of PC col⁃umns and cast-in-place concrete(CIPC)columns were studied.The influence of impact position,axial load ratio,strengths of joint and grout sleeve connection on the impact performance of PC columns was examined,and the damage characteristics of PC col⁃umns were analyzed from the perspective of curvature distribution.The results show that PC column and CIPC column exhibit sim⁃ilar nonlinear mechanical behaviors under the same impact conditions.However,the force transfer mechanism and failure patterns of the columns below the impact point are quite different.In addition,the curvature distribution could be utilized to describe the damage concentrations of the impacted columns.The change of impact position will vary the resistance mechanism of PC columns,and the axial load ratio can improve the anti-impact capacity of PC columns to a certain extent.Due to the significant local effect of impact loadings,the strengths of joint and grout sleeve connection mainly affect the damage mechanism of the column near the joint.
作者
赵武超
叶继红
周知
ZHAO Wu-chao;YE Ji-hong;ZHOU Zhi(Jiangsu Key Laboratory Environmental Impact&Structural Safety in Engineering(China University of Mining and Technology),Xuzhou 221116,China;School of Transportation and Logistics Engineering,Wuhan University of Technology,Wuhan 430063,China)
出处
《振动工程学报》
EI
CSCD
北大核心
2023年第1期225-234,共10页
Journal of Vibration Engineering
基金
国家自然科学基金资助项目(52108184)
中国博士后科学基金资助项目(2020M671643)
江苏省博士后科研资助计划(2020Z120)
中央高校基本科研业务费专项资金资助项目(2020QN67)。
关键词
装配式混凝土柱
撞击荷载
灌浆套筒连接
接缝
曲率分布
precast concrete column
impact loadings
grouted sleeve connection
joint
curvature distribution
