燕尾榫样式对CFRP加固榫卯接长木梁抗弯性能影响试验

通过11根木梁的静力受弯试验,研究燕尾榫样式对榫卯接长木梁加固后的抗弯性能的影响.试验结果表明,未加固前榫卯接长木梁承载力较低,仅为完整木梁的1.00%~2.62%,经CFRP布加固后其抗弯承载力可提高至完整木梁的50%~83.33%;旋转90°后,传统燕尾榫进行榫卯接长和采用榫头带榫肩接长,其抗弯承载力和能量吸收能力提高.燕尾榫榫头斜率从0.1变化至0.3,木梁的抗弯承载力和能量吸收能力随之提高,其抗弯承载力分别可达完整木梁的71.43%~83.33%,能量吸收能力分别达完整木梁的43.01%~61.33%.当燕尾榫榫头长度超过传统燕尾榫榫头长度时,其抗弯承载力、能量吸收能力和刚度反而降低.

Experimental study for the effect of dovetail style on the flexural behavior of timber beams extended by a mortise - tenon joint and strengthened by CFRP sheets

By a static bending test of eleven timber beams, the effect of dovetail styles on the flexural behavior of timber beams extended by a mortise-tenon joint and strengthened by CFRP sheets was studied. The results show that the flexural loading capacity of the timber beams extended by a mortise-tenon joint and not strengthened by CFRP sheets is relatively low, only 1.00% to 2.62% of the integrated wooden beams. The flexural loading capacity of the timber beams extended by a mortise-tenon joint and strengthened by CFRP sheets reaches 50% to 83.33% of the integrated wooden beams. Compared with traditional dovetail mortise, the flexural loading capacity and energy absorption ability increase for the timber beams extended by dovetail mortise or the dovetail mortise with tenon shoulder after rotating 90 degree With the dovetail tenon slope varying from 0.1 to 0.3, the flexural loading capacity and energy absorption capability of wooden beams increase. Their flexural loading capacities are 71.43% to 83.33% of the integrated wooden beam and their energy absorption capacities are 43.01% to 61.33% of the integrated wooden beam. When the length of dovetail tenons exceeds that of the traditional dovetail tenons, the bending loading capacity, the energy absorption ability and the stiffness of the timber beams reduce.