Wu Shixu, Tong Keting, Wang Jianmin, Li Yushun
School of Civil and Environmental Engineering, Ningbo University, Ningbo 315211, China.
College of Civil Engineering & Architecture, Qingdao Agricultural University, Qingdao 266109, China.
Materials (Basel). 2021 Feb 19;14(4):983. doi: 10.3390/ma14040983.
To expand the application of bamboo as a building material, a new type of box section composite column that combined bamboo and steel was considered in this paper. The creep characteristics of eight bamboo-steel composite columns with different parameters were tested to evaluate the effects of load level, section size and interface type under long-term loading. Then, the deformation development of the composite column under long-term loading was observed and analyzed. In addition, the creep-time relationship curve and the creep coefficient were created. Furthermore, the creep model of the composite column was proposed based on the relationship between the creep of the composite column and the creep of bamboo, and the calculated value of creep was compared with the experimental value. The experimental results showed that the creep development of the composite column was fast at first, and then became stable after about 90 days. The creep characteristics were mainly affected by long-term load level and section size. The creep coefficient was between 0.160 and 0.190. Moreover, the creep model proposed in this paper was applicable to predict the creep development of bamboo-steel composite columns. The calculation results were in good agreement with the experimental results.
为拓展竹子作为建筑材料的应用，本文考虑了一种新型的竹钢组合箱形截面复合柱。对八根不同参数的竹钢复合柱进行徐变特性试验，以评估长期荷载作用下荷载水平、截面尺寸和界面类型的影响。然后，对复合柱在长期荷载作用下的变形发展进行了观测和分析。此外，绘制了徐变-时间关系曲线和徐变系数。进一步地，基于复合柱徐变与竹子徐变之间的关系，提出了复合柱的徐变模型，并将徐变计算值与试验值进行了比较。试验结果表明，复合柱的徐变发展初期较快，约90天后趋于稳定。徐变特性主要受长期荷载水平和截面尺寸的影响。徐变系数在0.160至0.190之间。此外，本文提出的徐变模型适用于预测竹钢复合柱的徐变发展。计算结果与试验结果吻合良好。
