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应县木塔建造于1056年,高达67.31m,而当时对木材横纹承压受力性能缺乏应有的知识,致使木塔下部1～3层柱顶水平木构件横纹承压应力严重超过设计值,产生不可恢复的承压变形,部分构件已严重劈裂。本文提出用玻璃纤维增强塑料(GFRP)棒局部增强横纹承压技术,短期荷载试验结果表明,组合木构件的横纹承压强度大幅度提高,刚度有所增加,其延性性能得到大的改善。在深入研究GFRP棒增强机理的基础上,提出了GFRP增强木材组合构件横纹承压承载力的简化计算公式。
The construction of Yingxian wooden tower in 1056 was as high as 67.31m. At that time, the lack of knowledge of the stress bearing properties of the horizontal stripes of wood led to the severe stress in the horizontal stripes of 1 to 3 columnar horizontal wooden members in the lower part of the wooden tower Design values, resulting in unrecoverable pressure deformation, some of the components have been severely split. In this paper, the technology of locally reinforced cross-section pressure-bearing reinforced with glass fiber reinforced plastic (GFRP) rods is proposed. The results of short-term load test show that the cross-section compressive strength of the composite wood components has been greatly increased, the rigidity increased and the ductility improved greatly . On the basis of further research on the reinforcement mechanism of GFRP rods, a simplified calculation formula for the bearing capacity of GFRP reinforced cross-section of timber composite members is proposed.