GFRP筋与砂浆动态黏结应力分布研究

发布时间：2018-04-21 14:53

本文选题：玻璃纤维复合材料筋 + 黏结力　；参考：《塑料工业》2017年01期

【摘要】：玻璃纤维复合材料(GFRP)筋土钉在支护结构中的受力规律及作用机理是有待深入研究的问题。针对饱和聚酯基GFRP筋与砂浆黏结力作用,采用150 mm×150 mm×1 000 mm砂浆试块锚固GFRP筋体,开展循环拉拔性能实验。利用应变片监测拉拔中筋体受力,并以此来分析筋体受力分布规律,并比较各循环阶段的受力。结果表明,随着循环次数增加,GFRP筋与砂浆黏结应力峰值有逐渐向拉拔端移动的趋势:0~10 cm段所承担黏结力随着循环次数增加,从34%增长到69%。并且筋体与砂浆的黏结力主要存在于锚固段前20 cm处。前三次拉拔,前20 cm所承担的黏结应力分别为56%、70%、82%。进入第四次循环后,10 cm段砂浆对筋体约束降低,其所占比值也开始随之降低至62%、67%。
[Abstract]:The stress law and action mechanism of GFRP- reinforced soil nailing in support structure need to be deeply studied. In view of the bond force between saturated polyester based GFRP bars and mortar, the GFRP bars were anchored by 150 mm 脳 150 mm 脳 1 000 mm mortar test blocks, and the cyclic drawing performance experiments were carried out. The strain gauge is used to monitor the stress of the steel body in drawing, and to analyze the stress distribution law of the reinforcement body, and to compare the stress in each cycle stage. The results show that with the increase of cycle times, the peak value of bond stress between GFRP bars and mortar has a tendency of moving gradually to the drawing end. The bonding force of the 10 cm section of 10 cm is increased from 34% to 69% with the increase of the number of cycles. The bonding force between the reinforcement and mortar is mainly located at 20 cm before the anchoring section. The bonding stresses of the first three drawing and the first 20 cm were 5650 and 82, respectively. After entering the fourth cycle, the ratio of mortar at 10 cm to the reinforcement decreases, and the ratio decreases to 62 / 67.
【作者单位】：武汉科技大学城市建设学院;
【基金】：国家自然科学基金项目(51278391) 武汉市城建委科技计划项目(201553)
【分类号】：TU528;TU599

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