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提出一种新型的竖嵌CFRP板条层板增强的胶合木梁,对其进行受弯性能试验研究。试件包括3根普通胶合木梁、12根竖嵌CFRP板条层板增强的胶合木梁及3根横嵌CFRP板增强的胶合木梁。研究了其不同的破坏形态,破坏机理及受弯性能等,按不同的配筋率、不同的配筋截面形式及不同CFRP板增强方式等影响因素对试件的受弯承载力、刚度、延性等结构性能进行分析比较。试验结果表明,相比普通胶合木梁,增强后试件受弯承载力提高了34.2%~52.3%,刚度提高了8%~28.5%,增强后试件破坏形式由脆性受拉破坏转变为塑性受压破坏;对比传统横嵌CFRP板增强方式,竖嵌CFRP板条层板增强的胶合木梁的受弯承载力及极限变形均有明显提高。结合力学模型提出了三种破坏形态的受弯承载力计算公式,并与实际试验结果进行对比,理论计算结果与试验结果吻合较好。
A new type of glued wood beam reinforced with CFRP slab laminates is put forward, and its bending performance is tested. The specimen consists of 3 ordinary glulam beams, 12 glued wooden beams reinforced with CFRP slats and 3 glued wooden beams reinforced with CFRP slabs. The different failure modes, failure mechanism and flexural properties were studied. According to different factors such as the ratio of reinforcement, different section forms of reinforcement and different methods of CFRP board reinforcement, the flexural capacity, stiffness and ductility Other structural performance analysis and comparison. The experimental results show that the flexural capacity of the strengthened specimens increases by 34.2% -52.3% and the stiffness increases by 8% -28.5% compared with that of the conventional glulam beams, and the failure mode of specimens increases from brittle fracture to plasticity Compared with the traditional way of CFRP slab reinforcement, the flexural bearing capacity and ultimate deformation of the glued timber beam reinforced by CFRP slab are obviously improved. Combined with the mechanics model, the formulas for calculating the flexural capacity of three kinds of failure modes are proposed and compared with the actual test results. The theoretical calculation results are in good agreement with the experimental ones.