CFRP维修加固局部受损木柱的试验研究

木柱在长期使用过程中易发生底端腐朽或局部损伤。共进行13根木柱采用局部顺纹木块替换并用CFRP布包裹的试验研究,取得了较好的维修加固效果。研究结果表明,受损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CFRP布包裹后,其受压承载力和延性性能可得到完全恢复;但采用横纹木块替换时,其受压承载力不能得到完全恢复。顺纹木块局部替换并用CFRP布包裹维修加固局部受损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。

An experimental study on partially-damaged wood columns repaired and strengthened with CFRP

Wood is a traditional construction material with excellent properties for a variety of applications, and most of the Chinese traditional buildings are made of wood materials. Wood members, especially columns, are prone to decay damage. A total of 13 partially-damaged wood columns repaired and strengthened with new wood blocks parallel to the wood grains and wrapped with CFRP stripes were experimentally studied. The ultimate compressive strength of partially-damaged wood columns is significant 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, both the load-bearing capacity and the ductility would be restored. If the wood blocks were misplaced perpendicularly to the wood grains, the load-bearing capacity would obviously decrease. It is found that combination of new wood blocks parallel to the wood grains and CFRP stripes is effective for repairing and strengthening partially-damaged wood columns.