摘要
重组竹作为建筑材料时,除了受静态荷载外,还会受到冲击荷载的作用。特别是当重组竹建筑在经受火灾后,若再承受水平方向的冲击荷载,结构本身的缺陷在外力作用下有可能被放大。基于重组竹在静态下的力学性能研究,采用霍普金森压杆系统在10、13和16 m/s的冲击速度下对不同温度处理的重组竹横纹抗压试件进行动态力学性能试验研究。结果表明,在冲击速度相同时,当温度从20℃升至180℃时,重组竹横纹动态抗压比例极限强度和抗压弹性模量呈逐步上升的趋势,温度从180℃升至280℃时,横纹动态抗压比例极限强度和抗压弹性模量呈快速下降的趋势。基于此,提出不同温度处理重组竹横纹动态抗压比例极限强度和抗压弹性模量的影响系数计算公式,为重组竹构件在高温与冲击耦合作用下的工程应用提供理论依据与技术参考。
Bamboo scrimber is inevitably subjected to impact loads in addition to the static load.Specifically,after the bamboo-scrimber-framed building is damaged by fire,the structure is loaded with the horizontal impact.The defects in the inherent structure may be amplified under the dynamic condition.The previous study on the mechanical properties of bamboo scrimber perpendicular to grain under the static conditions showed the Hopkinson pressure bar system was used to conduct dynamic mechanical performance tests on specimens at different temperatures under impact velocities of 10 m/s,13 m/s,and 16 m/s,respectively.Experiment results show that when the impact velocity remains constant,the dynamic proportional limit strength of compression,and the dynamic compressive elastic modulus of the bamboo scrimber perpendicular to grain gradually increased as the temperature increased from 20℃to 180℃.However,these properties decreased rapidly when the temperature continues increasing up to 280°C.Based on these findings,a formula for calculating the coefficient of influence on the dynamic proportional limit strength of compression and the dynamic compressive elastic modulus of bamboo scrimber perpendicular to grain under different temperatures was proposed,providing a theoretical basis and technical reference for the engineering application of bamboo scrimber components under high temperature and impact coupling.
作者
薛兆丰
盛叶
郭任坤
郭楠
董帅
XUE Zhaofeng;SHENG Ye;GUO Renkun;GUO Nan;DONG Shuai(College of Transportation and Civil Engineering,Fujian Agriculture and Forestry University,Fuzhou 350002,Fujian,China;Fuzhou Planning&Design Research Institute Group Co.Ltd.,Fuzhou 350002,Fujian,China)
出处
《木材科学与技术》
北大核心
2025年第3期33-40,共8页
Chinese Journal of Wood Science and Technology
基金
福建省科技厅国家科技项目备案类“秸秆夹芯竹木复合集装箱底板关键技术研究及应用”(2023L3046)
中建股份科技研发项目“绿色低碳重组竹装配式建筑的关键技术研究”(CSCEC-2022-Z-58)。
关键词
重组竹
冲击荷载
分离式霍普金森压杆
温度
加载率
bamboo scrimber
impact load
split Hopkinson pressure bar
temperature
loading rate
作者简介
薛兆丰(2000-),男,硕士研究生。Email:1019357072@qq.com;通讯作者:盛叶,女,教授。Email:qzrse@163.com。
