竖嵌CFRP板条层板增强的胶合木梁受弯性能研究

发布时间：2018-02-14 12:41

本文关键词： 层板胶合木梁 CFRP板条竖嵌静载试验受弯性能　出处：《建筑结构学报》2014年08期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:A new type of glued wood beam reinforced by vertical CFRP laminates is proposed. The flexural properties of the beams were studied. The specimens included 3 beams of general glued wood and 12 beams reinforced by vertical CFRP laminates and 3 beams reinforced by transverse CFRP plates. The different failure modes of the beams were studied. The failure mechanism and flexural properties of the specimens are analyzed and compared according to different reinforcement ratio, different reinforcement cross-section forms and different reinforcement modes of CFRP plate. The structural properties of the specimens such as flexural capacity, stiffness and ductility are analyzed and compared. Compared with the ordinary glued wood beams, the flexural capacity of the strengthened specimens is increased by 34.2and 52.3, the stiffness of the specimens is increased by 828.55.The failure mode of the strengthened specimens is changed from brittle tensile failure to plastic compression failure. The flexural bearing capacity and ultimate deformation of glued wood beams reinforced by vertical CFRP laminates are obviously improved. Combined with the mechanical model, the formulas for calculating the flexural bearing capacity of three kinds of failure modes are proposed and compared with the experimental results. The theoretical results are in good agreement with the experimental results.
【作者单位】：南京工业大学土木工程学院;
【基金】：国家高技术研究发展计划(863计划)(2012AA03A204)
【分类号】：TU366.3

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