海洋环境下BFRP筋与混凝土黏结性能及基本锚固长度计算方法研究

发布时间：2017-12-27 03:13

本文关键词：海洋环境下BFRP筋与混凝土黏结性能及基本锚固长度计算方法研究　出处：《土木工程学报》2016年07期 　论文类型：期刊论文

【摘要】：本文研究了海水浸泡环境对BFRP(Basalt Fiber Reinforced Polymer)筋与混凝土黏结性能的影响,测试了不同温度(25℃,40℃和55℃)下极限黏结强度随浸泡龄期的变化规律。结合加速腐蚀理论,并考虑环境温度和湿度的影响,对极限黏结强度随服役年限的变化规律进行了预测。参考既有文献中的97个BFRP筋黏结强度试验数据,推导了BFRP筋短期黏结强度计算公式。依据本文理论预测得出的50年设计使用年限下的黏结强度损伤因子,推导了不同环境湿度类别下的锚固长度计算公式。试验结果表明:25℃,40℃和55℃海水浸泡60天后,极限黏结强度分别降低了5.8%、9.1%和13.0%。预测结果表明,在南海年平均温度下,服役50年后,室内环境、一般室外环境和潮湿海洋环境类别下的黏结强度损伤因子分别为0.19、0.32和0.51。本文提出的基本锚固长度设计方法可为相关规范条款的制定提供依据。
[Abstract]:In this paper, the effect of seawater immersion on the bonding properties of BFRP (Basalt Fiber Reinforced Polymer) bars and concrete is studied. The variation of ultimate bond strength with immersion age at different temperatures (25, 40 and 55 degrees) is tested. Combined with the theory of accelerated corrosion and the influence of ambient temperature and humidity, the variation of ultimate bond strength with service life was predicted. In reference to the test data of 97 BFRP bond strength in the existing literature, the formula for calculating the short-term bond strength of BFRP tendons is derived. Based on the prediction of the bond strength damage factor in the past 50 years, the formula of anchorage length under different environmental humidity categories is derived. The test results showed that the ultimate bond strength decreased by 5.8%, 9.1% and 13% after 60 days of seawater immersion at 25, 40 and 55. The prediction results showed that under the annual average temperature of the South China Sea, after 50 years of service, the bond strength damage factors of indoor environment, general outdoor environment and wet marine environment were 0.19, 0.32 and 0.51, respectively. The basic anchor length design method proposed in this paper can provide the basis for the formulation of relevant standard terms.
【作者单位】：东南大学混凝土及预应力混凝土结构教育部重点实验室;东南大学国家预应力工程技术研究中心;
【基金】：国家“973”计划(2012CB026200) 国家自然科学基金(51178099) 教育部科学技术研究项目(113029A)
【分类号】：TU528
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