不均匀胶层对CFRP板加固梁的界面应力影响

发布时间：2018-07-05 19:32

本文选题：CFRP + 缺口　；参考：《湖南大学学报(自然科学版)》2017年03期

【摘要】：采用数值试验研究了CFRP板加固钢筋混凝土梁中不均匀胶层的应力及加固界面应力.被加固梁界面上设置缺口改变胶层的局部厚度,根据缺口的深度、宽度、位置建立6种分析工况.研究表明,缺口距离CFRP板端部较近时,界面峰值应力会高于无缺口工况,缺口远离CFRP板端部位置时,峰值界面应力几乎不受影响;缺口距离CFRP板端部为CFRP板长的0.83%和1.25%时,峰值界面剪应力和正应力分别达到最大值;当缺口的长度或深度增大时,峰值界面剪应力和界面正应力均增大,界面应力对于缺口深度更敏感;在远离CFRP板端部区域,胶层中的应力沿其厚度方向均匀分布;当缺口出现在CFRP板端部附近时,CFRP板端部胶层中的应力沿厚度方向变化更大且应力在缺口区域内分布更加不均匀.
[Abstract]:The stress of non-uniform adhesive layer and the interfacial stress of reinforced concrete beams strengthened with CFRP plates were studied by numerical experiments. The local thickness of the adhesive layer is changed by setting a notch on the interface of the strengthened beam, and six analysis conditions are established according to the depth, width and position of the notch. The results show that when the gap is close to the end of the CFRP plate, the peak stress of the interface is higher than that of the non-notched plate, and the peak stress of the interface is almost unaffected when the notch is far away from the end of the CFRP plate, and when the gap is 0.83% of the length of the CFRP plate and 1.25% of the length of the CFRP plate, When the length or depth of the notch increases, both the peak interfacial shear stress and the interface normal stress increase, and the interfacial stress is more sensitive to the notch depth. The stress in the adhesive layer distributes uniformly along the thickness direction, and the stress in the end layer of the CFRP plate changes more along the thickness direction when the notch appears near the end of the CFRP plate, and the stress distribution is more uneven in the gap region.
【作者单位】：湖南大学土木工程学院;
【基金】：国家自然科学基金资助项目(51378199,51108174)~~
【分类号】：TU375.1

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