摘要
针对钢绞线与混凝土的拉拔试验中,由于钢绞线的特殊构造不能开槽内贴应变片测量两者间局部粘结力的问题,建立了由拉拔端整体滑移理论的推导局部粘结滑移的方法。该方法借助微元法思想,通过将混凝土梁划分成有限单元,以修正的带未知变量的局部粘结滑移模型(CEB Model Code 90)为基础建立理论推导局部拉拔力的过程,并与实际拉拔试验相结合,确定模型中的未知变量,推导局部粘结滑移。结果表明:模型中最大粘结力对应的滑移量n和开始进入残余段粘结力对应的滑移量m的值分别取0.7,1.7 mm时,理论推导的拉拔力和实际测得的数据误差在5%以内,具有较好的吻合性。
A theoretical derivationmethod onlocal bond slipthrough global bond slipis proposedsince thespecial structure of steel strand made it impossible to slotted and paste the strain gauge to measure the local bond slip in pull-out tests. The method using differential element method to dividethe concrete beam into finite elements,Based on the modified local bond slip model（ CEB Model Code 90） with unknown variables,This paperestablishes the theoretical derivation process of local pulling force,Combined with the actual drawing test to determine the unknown variables in the model,Then derive the local bond slip. The result show that when the slip amount n and m in the model were taken 0. 7 mm and 1. 7 mm respectively,Thetheory derivation local bond stress and the actual measured data within an error of 5%,the display has a better consistency. So it can use global bond slip to deduction the local bond slipthrough this method.
出处
《公路工程》
北大核心
2016年第2期113-117,135,共6页
Highway Engineering
基金
湖湘青年科技创新创业平台培养对象自主选题项目
湖南省自然科学杰出青年基金项目(14JJ1022)
