摘要
为了揭示钢筋混凝土管在连续侧向冲击荷载作用下的破坏机理,完成了6个钢筋混凝土管的横向冲击测试,考虑了不同落锤高度、冲击次数以及简支、固支两种约束形式对钢筋混凝土管侧向冲击动力响应的影响。提出了冲击力和跨中变形的预测公式并采用试验数据进行了拟合,得到了不同冲击速度、冲击次数对管道冲击力峰值和跨中位移的变化规律。采用吸能系数来量化评价管道承受侧向撞击时的吸能能力。结果表明,固支约束管道变形破坏显著好于简支约束试件,承受多次侧向撞击后,吸能系数增大,抗冲击变形能力明显下降。
To reveal the failure mechanism of reinforced concrete pipes under continuous lateral impact load,the transverse impact tests of 6 reinforced concrete pipes were completed,taking into account following influential factors:drop hammer height,impact times,and two restraint forms of simply supported and fixed supported.Their influences on the dynamic responses of the concrete pipes under lateral impact were analysed.The prediction formulas for the impact force and mid-span deformation were put forward and fitted with test data.The variation of the peak impact force and mid-span displacement of the pipelines with different impact speed and impact times was investigated.The energy absorption coefficient was used to quantify and evaluate the energy absorption capacity of the pipelines when subjected to lateral impact.The results show that the anti-deformation and anti-damage capability of the fixed-supported constrained pipelines is significantly better than that of the simply-supported constrained specimens.After bearing the action of multiple lateral impacts,the energy absorption coefficient increases,and the impact deformation resistance decreases significantly.
作者
杨金辉
胡少伟
叶宇霄
娄本星
明攀
王思瑶
YANG Jinhui;HU Shaowei;YE Yuxiao;LOU Benxing;MING Pan;WANG Siyao(School of Water Resources and Hydropower Engineering,Wuhan University,Wuhan 430070,China;Material and Structural Engineering Department,Nanjing Hydraulic Research Institute,Nanjing 210029,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2022年第2期281-289,304,共10页
Journal of Vibration and Shock
基金
国家自然科学基金重点项目(51739008)。
关键词
钢筋混凝土管
连续侧向冲击
动力响应
reinforced concrete pipe
continuous lateral impact
dynamic response
