GFRP筋混凝土桥面板剪切承载力理论算法研究

发布时间：2018-12-09 19:00

【摘要】：采用玻璃纤维复合筋(GFRP Bar)材代替钢筋能够有效解决传统钢筋混凝土桥面结构由于钢筋锈蚀所引起的结构功能退化问题。过去试验研究表明在FRP筋混凝土桥面承受集中荷载作用下,冲切破坏模式是一种常见的破坏模式。本次研究采用现有规范及已经发表抗冲切承载力计算模型对多组混凝土桥面板试验结果进行冲切承载力预测。通过与试验结果对比发现,由于大多数理论模型是基于简支构件试验结果建立的经验公式,其无法准确计算FRP筋混凝土桥面结构的冲切承载力。笔者前期建立的GFRP筋混凝土桥面板承载力理论方法考虑了拱效应的作用,计算结果与试验结果有较好的吻合。理论分析中发现,由于较高配筋率和较小跨高比,大部分GFRP筋混凝土桥面板发生剪切破坏而非弯切破坏。因此本文建立了简化的GFRP筋混凝土板剪切承载力计算方法,该模型计算结果与多个试验结果吻合良好。
[Abstract]:The problem of structural function degradation caused by steel corrosion of traditional reinforced concrete bridge deck structure can be effectively solved by using glass fiber composite reinforcement (GFRP Bar) instead of steel bar. Past experimental studies show that the punching failure mode is a common failure mode under concentrated loads on the concrete deck with FRP bars. In this study, the punching capacity of concrete bridge slabs was predicted by using existing codes and published calculation models of punching shear capacity. By comparing with the experimental results, it is found that because most of the theoretical models are empirical formulas based on the test results of simply supported members, it is impossible to accurately calculate the punching capacity of concrete deck structures with FRP bars. The effect of arch effect is considered in the theory of bearing capacity of GFRP reinforced concrete deck slab established by the author earlier, and the calculated results are in good agreement with the experimental results. It is found in theoretical analysis that shear failure rather than flexural shear failure occurs in most GFRP reinforced concrete deck slabs due to high reinforcement ratio and small span height ratio. Therefore, a simplified method for calculating the shear capacity of concrete slabs with GFRP bars is established in this paper. The calculated results of the model are in good agreement with the experimental results.
【作者单位】：东莞理工学院建筑工程系;
【基金】：广东省优秀青年教师培养计划(Yq2014155) 国家自然科学基金(50908055,51308117) 广东省交通厅科技计划(2013-02-040)
【分类号】：U443.31

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