论文部分内容阅读
格鲁斑胶合竹(Glu Bam)是一种新型竹质工程材料,在使用环境中的耐久性对竹结构建筑的安全性有重要影响,但目前这方面的研究还处于空白。为此提出了一种适用于Glu Bam材料耐候性研究的人工气候加速老化试验方法及设备,并对Glu Bam经历不同等效老化时间后的变形和基本力学性能进行试验和分析。研究结果表明:干湿循环导致Glu Bam老化后厚度显著增大,产生不同程度的分层开裂,是其基本力学性能降低的主要原因。所有的力学指标都随老化时间的增加而单调下降,且内结合强度对老化时间最为敏感。基于老化影响因子β、内结合强度相关系数η和厚度变化相关系数θ,提出了一种基于厚度测试的Glu Bam老化后的力学性能评估方法,但这种方法的准确性还需要进行大量试验。对于直接暴露于干湿循环环境中的Glu Bam,需要采取必要的防护措施,这方面需要进行专门研究。
Glu Bam is a new type of bamboo engineering material. Its durability in the environment of use has a significant impact on the safety of bamboo-based buildings. However, the research in this area is still blank. To this end, an accelerated weathering test method and equipment suitable for GluBam weathering research are presented. The deformation and basic mechanical properties of GluBam after different equivalent aging time are tested and analyzed. The results show that the main reason for the decrease of the basic mechanical properties of Glu Bam after wet-dry cycle is that the thickness of Glu Bam after aging is significantly increased, resulting in different levels of delamination cracking. All the mechanical indicators monotonously decrease with the increase of aging time, and the internal bond strength is the most sensitive to the aging time. Based on the influence factor of aging β, the correlation coefficient η of internal bond strength and the correlation coefficient θ of thickness, a method of evaluating the mechanical properties of Glu Bam after aging based on the thickness test was proposed. However, the accuracy of this method needs a large number of tests. For Glu Bams that are exposed directly to wet and dry cycles, the necessary precautions need to be taken and special research is needed in this area.