张景杭,吴兆旗?覮,姜绍飞,梁子杨.BFRP模壳不排水加固混凝土墩柱 轴压性能试验研究[J].湖南大学学报:自然科学版,2020,(11):95~105
BFRP模壳不排水加固混凝土墩柱 轴压性能试验研究
Experimental Study on Axial Compression Behavior of Concrete Pier Column Strengthened with Basalt FRP Mould Shell without Drainage
  
DOI:
中文关键词:  不排水加固  BFRP模壳  混凝土墩柱  轴压性能  承载力计算
英文关键词:undrained reinforcement  Basalt FRP mould shell  concrete pier column  axial compression performance  calculation of bearing capacity
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作者单位
张景杭,吴兆旗?覮,姜绍飞,梁子杨 (福州大学 土木工程学院福建 福州 350108) 
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中文摘要:
      为实现不排水快速加固桥梁水下混凝土墩柱目的,基于水下自应力不分散混凝土及“装配式”理念,提出一种BFRP(Basalt Fiber Reinforced Polymer)模壳不排水快速加固水下混凝土墩柱的加固方法. 为研究采用该方法加固的混凝土墩柱的轴压性能,共设计、制作了8个试件进行轴心受压试验,研究了BFRP模壳加固、填充混凝土性能、填充层厚度、养护环境等因素对试件的轴压破坏模式、承载力、延性等的影响. 试验结果表明:BFRP模壳加固可有效提高试件的承载能力与延性;采用水下自应力不分散混凝土作为填充层,掺入适量的膨胀剂,同时控制填充层的加固厚度,有利于获得更好的加固效果;淡水环境下,BFRP模壳加固试件的极限承载力要优于海水环境下的试件等. 根据试验结论及现有的一些约束混凝土柱轴压承载力公式,建议了BFRP模壳约束加固混凝土墩柱的轴压承载力计算公式,理论计算结果与试验结果吻合良好.
英文摘要:
      In order to achieve the purpose of rapid reinforcement of underwater concrete pier column of bridge without drainage, this paper proposed a strengthening method for underwater concrete pier column with Basalt FRP mould shell without drainage based on the concept of underwater self-stress undispersed concrete and “assembly type”. To study the axial compression performance of concrete pier columns by this strengthening method, eight specimens were made to carry out axial compression tests. The effects of Basalt FRP mould shell reinforcement, filled concrete performance, filling layer thickness and maintenance environment on the axial compression failure mode, bearing capacity and toughness of the specimens were studied. The test results show that Basalt FRP mould shell reinforcement could effectively improve the bearing capacity and toughness of the specimen;using underwater self-stress non-dispersive concrete as filling layer, adding proper amount of expansive agent, and controlling the strengthening thickness of the filling layer were beneficial to obtain better reinforcement effect. In freshwater environment, the ultimate bearing capacity of Basalt FRP mould shell strengthened specimen was better than that of seawater environment. According to the experimental results and some existing formulas of axial compressive bearing capacity of confined concrete columns, the formulas for calculating the axial compressive bearing capacity of concrete pier columns strengthened with Basalt FRP mould shells was proposed, and the theoretical calculation results were in good agreement with the experimental results.
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