混杂纤维增强木梁的受弯性能试验研究

选用碳纤维(CF)、玻璃纤维(GF)和高强玻璃纤维(SGF)为增强材料,制作CF,CF/GF和CF/SGF层间组合混杂纤维增强木梁,并对其受弯性能进行了试验研究,同时分析了该木梁的破坏形态和破坏机理,讨论了其荷载-位移特征、极限承载力和延性.结果表明:与单一CF增强相比,合理匹配混杂纤维增强复合材料(HFRP)可显著提高木梁的承载力和延性.提出了HFRP增强木梁的极限承载力计算方法.

Experimental Study on Flexural Performance of Wood Beams Strengthened with HFRP

In order to increase the strengthening efficiency, a proposal for strengthening wood beams with hybrid fiber reinforced polymer(HFRP) was suggested. Carbon fiber(CF), glass fiber(GF) and high strength glass fiber(SGF) were chosen as strengthening materials. CF strengthening beams, hybrid CF/GF strengthening beams, and hybrid CF/SGF strengthening beams were produced. A flexural experimental study with 9 strengthened beams and 3 control wood beams was carried out. The failure modes and failure mechanism of the strengthened beams were analyzed. The load displacement characteristics, ultimate moment capacity and ductility of the strengthened beams were investigated. The test results show that, compared with single CF strengthening, HFRP strengthening may significantly increase the ductility of the strengthened wood beams, under the premise of increasing moment capacity. A calculation model for predicting ultimate moment capacity of wood beams strengthened with HFRP was put forward. The calculation results show that it is in agreement with the tested values.