重组竹高温下单轴受压性能试验研究  

Experimental study on uniaxial compressive properties of parallel strand bamboo at high temperatures

作　　者：朱彦[1,2] 卞玉玲 周爱萍[1] 黄东升[1] ZHU Yan;BIAN Yuling;ZHOU Aiping;HUANG Dongsheng(National Engineering Research Centre of Biomaterials,Nanjing Forestry University,Nanjing 210037,China;School of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China;Wuxi Vocational Institute of Commerce,Wuxi 214153,China)

机构地区：[1]南京林业大学生物质材料国家地方联合工程研究中心,江苏南京210037 [2]南京林业大学土木工程学院,江苏南京210037 [3]无锡商业职业技术学院,江苏无锡214153

出　　处：《建筑结构学报》2021年第9期127-134,共8页Journal of Building Structures

基　　金：国家自然科学基金项目(51778299)。

摘　　要：高温环境下重组竹力学性能研究,是建立重组竹高温本构关系和重组竹结构抗火设计方法的基础。开展了重组竹高温环境(50~290℃,16个工况)下单轴受压试验,研究了重组竹顺纹与横纹抗压强度、弹性模量和质量损失等随温度的变化规律,给出了重组竹顺纹和横纹抗压强度、弹性模量折减系数与温度关系的经验公式,该公式适用于工程用重组竹高温受压性能参数的计算。通过各温度工况下试件的微观结构变化比较,分析了重组竹在高温环境下的受压破坏机理。结果表明:重组竹顺纹和横纹抗压强度折减与欧洲规范EN 1995-1-2中给出的木材高温抗压强度折减规律类似;重组竹高温环境下竹纤维细胞壁成分降解、细胞壁变薄及其多层结构的消失是导致其受压性能降低的主要原因。The study of high-temperature performance of parallel strand bamboo(PSB) is essential to establish the high-temperature constitutive law and fire-resistance design methodology for PSB structures. In order to reveal the effect of temperature on the compressive strength in parallel-to-grain and perpendicular-to-grain directions, elastic modulus and mass loss, the uniaxial compressive tests for PSB were conducted under 16 working conditions at temperature from 50℃ to 290℃. The empirical formulas to describe the relationships between temperature and compressive strength, elastic modulus as well as mass loss of PSB were proposed, which can be used to calculate the compression parameters of PSB under high temperatures. The compressive failure mechanisms of PSB under high temperature were discussed according to the observation of post-test microscopic images of the test samples. The results show that the degradation of parallel-to-grain and perpendicular-to-grain compressive strengths is similar to the law proposed by EN1995-1-2 for wood. The compressive properties of PSB at high temperature are governed by the decompose of multi-layer structure of fiber cell wall.

关 键 词：重组竹 高温 单轴受压试验 受压性能 

分 类 号：TU366.3[建筑科学—结构工程] TU502.6