张望喜1,2,何超2,张瑾熠3,邓曦2,王志强2,易伟建1,2.钢筋半套筒灌浆连接高温后的力学性能试验研究 和粘结滑移分析[J].湖南大学学报:自然科学版,2019,(11):33~42
钢筋半套筒灌浆连接高温后的力学性能试验研究 和粘结滑移分析
Experimental Study and Bond Slip Analysis on Mechanical Properties of Half Grout Sleeve Splicing of Rebars after High Temperature
  
DOI:
中文关键词:  半套筒灌浆  单向静力拉伸试验  高温后  失效模式
英文关键词:half grout sleeve splicing  unidirectional static tension test  after high temperature  failure mode
基金项目:
作者单位
张望喜1,2,何超2,张瑾熠3,邓曦2,王志强2,易伟建1,2 (1.湖南大学 工程结构损伤诊断湖南省重点实验室湖南 长沙 410082 2. 湖南大学 土木工程学院湖南 长沙 4100823.湖南科技大学 土木工程学院湖南 湘潭 411201) 
摘要点击次数: 24
全文下载次数: 30
中文摘要:
      为避免装配式混凝土结构中钢筋半套筒灌浆连接在火灾后发生失效而造成严重后果,制作了27个14 mm钢筋半套筒灌浆连接试件,并通过高温后的单向静力拉伸试验研究其高温后的力学性能. 试验结果表明,钢筋半套筒灌浆连接试件高温后存在钢筋拉断、钢筋刮犁式拔出2种破坏模式,且浇水冷却使试件更容易出现后一种破坏模式;试件在拉伸过程中灌浆端连接钢筋与套筒之间会产生相对滑移,且随着外部温度的升高滑移量呈现非线性的增长趋势;基于600 ℃高温后的试验结果,依据已有黏结强度公式,给出了避免试件灌浆段钢筋在高温后发生刮犁式拔出破坏的建议;通过对试件弹性阶段的钢筋滑移量进行近似分析,得到了高温后自然冷却条件下钢筋滑移量与温度的二次函数关系曲线.
英文摘要:
      In order to avoid failure of the half grout sleeve splice of rebars in prefabricated concrete structures after fire and serious consequences,27 14 mm-half grout sleeve splicing specimens of rebars were manufactured to study their mechanical properties by unidirectional static tensile test after high temperature. The test results showed two failure modes of the specimens after high temperatures including fracture and pull-out of rebars, in which the latter one was more likely to occur when the specimens were cooled by water. During the tensile process, the relative slip can occur between the sleeve and the rebar connected at the grouting side, and the slip increased nonlinearly with the increase of the temperature. Based on the test results after 600 ℃ high temperature and the existing bond strength formulas,suggestions were given to avoid the pull-out failure of rebars after high temperature. According to approximate analysis of steel slip in elastic stage,the quadratic function curve between the slip and temperature under natural cooling after high temperature was obtained.
查看全文  查看/发表评论  下载PDF阅读器
关闭