工程科学与技术2025，Vol.57Issue(5)：14-23,10.DOI:10.12454/j.jsuese.202500097
侧向冲击下新型分层装配式格构柱动态响应试验
Experimental Study on the Dynamic Response of New Layered Prefabricated Lattice Columns Under Lateral Impact
摘要
Abstract
Objective This study designs a new layered prefabricated lattice column as a protective support structure,which presents unique advantages in preventing and controlling rockfall disasters.Two groups of nine specimens are designed and fabricated for impact testing to investigate the im-pact resistance and failure mechanisms of the proposed layered fabricated lattice column under low-velocity and high-mass impacts.The influ-ence of impact mass,impact height,and impact position on the dynamic response of the structure is analyzed by comparing the test results.A lin-ear relationship between residual deformation and impact energy is established through curve fitting,providing empirical support for engineering applications. Methods The dynamic response of a newly developed layered prefabricated lattice column under impact was systematically investigated through experimental testing.The test setup consisted of a track rod,a steel pipe fixed to a reaction wall,and an impact apparatus.A total of 9 specimens were examined under varying impact masses(60,80,and 100 kg),impact heights(3,4,and 5 m),and impact positions(near and far from the fixed end).The deformation characteristics and failure modes of the specimens were observed,and the impact time history curve,strain time his-tory curve,and displacement time history curve were recorded using a high-speed camera,dynamic acquisition instrument,and quartz sensor.The influence of different test parameters on the failure mode,impact peak value,impact platform value,impact duration,strain peak value,plastic strain,maximum lateral displacement,and residual displacement was identified through comparative analysis of the experimental results.Finally,a linear relationship between the impact energy and the residual deformation in the range of 2 400 to 5 000 J was established through curve fitting. Results and discussions The primary residual deformation of the new layered prefabricated columns after impact was local denting.When the specimen failed,the web member bent,and the bolts at both ends of the web member underwent a shear failure.Under identical impact energy conditions,the impact position has a significant effect on the dynamic response.Specimens impacted farther from the fixed end exhibited lower resistance,greater damage severity,and a more dispersed impact plateau value.With the increase in impact mass or impact height,both the im-pact peak value and impact duration increase.The mass has a more significant effect on the duration of the impact,while the impact velocity has a greater influence on the peak value of the impact.The residual deformation of the specimen increases with a rise in the impact energy.Speci-mens impacted near the fixed end exhibit larger residual displacements(up to 5.27 mm),whereas impacts away from the fixed end result in greater lateral displacements(up to 6.21 mm),as more energy is dissipated through vibration.The relationship between residual deformation and impact energy was established,with a deviation of less than 6%as determined by further regression analysis. Conclusions When the impact energy reached 5 000 J,the bolts of the web members undergo shear failure due to insufficient shear strength.Im-pact point farther from the fixed end reduce impact resistance of structure.Impact mass mainly affects the impact duration,while impact velocity primarily affects the peak impact force.Impacted near the fixed end exhibit larger residual displacements,while impacted farther from the fixed end exhibit larger lateral displacements.The linear relationship between residual deformation and impact energy provides a quantifiable means to assess structural damage,with an error £6%,demonstrating practical applicability in engineering.关键词
装配式格构柱/侧向冲击/试验研究/损伤变形/动力响应Key words
prefabricated lattice column/lateral impact/experimental investigation/damage deformation/dynamic response分类
建筑与水利引用本文复制引用
褚云朋,李勤,古松,张春涛,张海川..侧向冲击下新型分层装配式格构柱动态响应试验[J].工程科学与技术,2025,57(5):14-23,10.基金项目
国家自然科学基金项目(52268029) （52268029）
四川省自然科学基金项目(2023NSFSC0381) （2023NSFSC0381）
