局部损伤圆木柱维修加固方法的试验研究

Experimental study of strengthening methods of partially-damaged circular wood columns

对9根圆木柱采用局部顺纹木块替换并在接缝处用水平向CFRP布包裹进行维修加固研究。研究结果表明:不进行维修加固的受损圆木柱的极限承载力明显降低,降低幅度大于其截面损失幅度,且破坏呈明显的偏心受力特征;局部受损处用完好顺纹木块替换并用水平向CFRP布包裹后,其受压承载力可完全恢复;顺纹木块局部替换并用水平向CFRP布包裹维修加固局部受损圆木柱是行之有效的方法,可用于木结构维修加固的工程实践。

A total of 9 partially-damaged circular wood columns repaired and strengthened with new wood blocks parallel to the wood grains and wrapped with CFRP stripes were experimentally studied.The results show that the ultimate compressive strength of partially-damaged circular wood columns is significantly decreased in comparison with the control specimen,the range of decrease is larger than the loss of the cross-section,and the failure mode would change from central axial compression to eccentric compression.After replacing the damaged area with wood blocks parallel to the wood grains and wrapping up with CFRP stripes,the load-bearing capacity would be restored.Combination of new wood blocks parallel to the wood grains and CFRP stripes is effective for repairing and strengthening partially-damaged circular wood columns.