纤维织物网—聚合物砂浆加固RC梁界面粘贴及抗弯性能试验

发布时间：2018-05-31 16:36

本文选题：加固 + 模型试验　；参考：《长安大学》2017年硕士论文

【摘要】：纤维织物网—聚合物砂浆加固(TRC)是一种用聚合物砂浆将高强纤维织物网粘结至混凝土表面的加固技术。与常规FRP加固钢筋混凝土结构技术相比,TRC加固技术因使用聚合物砂浆这种水泥基无机凝胶材料,能够与原结构混凝土相互渗透并更好地相容,同时具有耐高温、能够用于水下环境等诸多优点。本文首先利用自主开发的TRC粘贴强度综合测试仪进行19组双剪试验,试验研究了纤维网有效粘贴长度、纤维网浸胶、粘砂以及纤维网净距等因素对粘贴性能的影响,并在此试验基础上建立了TRC粘结强度计算公式,推荐了一种可靠的粘贴方法—纤维网粘砂锚固粘贴。其次,本文还进行了1片对比梁和3片TRC加固梁的静力抗弯加载试验,研究了纤维网表面未处理、浸胶以及粘砂处理对T梁抗弯性能的影响。最终在完成上述两项试验的基础上得出以下结论:(1)聚合物砂浆抗压强度对TRC加固层粘结性能有重要影响,当砂浆抗压强度较高时可使纤维有效粘结长度减小;(2)本文推荐使用纤维网表面粘砂处理方式来控制纤维网的滑移,同时可以有效提升界面粘结强度。在保证有效粘结长度的前提下,对纤维网表面进行浸胶及粘砂处理可使粘结强度提高23.5%;(3)对T梁采用TRC加固后,加固梁与对比梁在弹性工作阶段刚度相近,但在屈服—破坏阶段加固纤维发挥了较大作用。采用最大加固量时(双层加固)可使结构刚度显著提高,同时极限承载能力提高24.4%,但对结构的加固使得其延性有所降低;(4)对TRC加固T梁极限承载力进行理论计算,到达极限强度前将纤维束视为线弹性材料,计算结果与试验值吻合较好。
[Abstract]:Fiber fabric network-polymer mortar reinforcement (TRCC) is a kind of strengthening technology which uses polymer mortar to bind high strength fiber fabric mesh to concrete surface. Compared with the conventional reinforced concrete strengthening technology, the polymer mortar, which is a cement based inorganic gel material, is more compatible with the original structure concrete and has high temperature resistance. Can be used in underwater environment and many other advantages. In this paper, 19 groups of double shear tests were carried out by using the self-developed TRC adhesive strength comprehensive tester. The effects of the effective adhesive length of the fiber mesh, the impregnation of the fiber network, the adhesive sand and the net spacing of the fiber mesh on the adhesive properties were studied. On the basis of this experiment, the formula for calculating the bond strength of TRC is established, and a reliable bonding method, that is, Anchorage and bonding of fibre-net bonded sand, is recommended. Secondly, the static flexural loading tests of one contrast beam and three TRC strengthened beams were carried out, and the effects of untreated surface of fiber mesh, soaking glue and sand on the flexural properties of T-beam were studied. Finally, on the basis of the above two tests, the following conclusions are drawn: (1) the compressive strength of polymer mortar has an important effect on the bond properties of TRC strengthened layer. When the compressive strength of mortar is high, the effective bond length of fiber can be reduced. On the premise of ensuring the effective bond length, the adhesive strength can be increased by soaking and sand bonding on the surface of the fiber mesh. After the T beam is strengthened by TRC, the stiffness of the strengthened beam and the contrast beam in the elastic working stage is close to that of the contrast beam. But in the yield-failure stage reinforcement of the fiber played a greater role. When the maximum reinforcement is adopted (double layer reinforcement), the stiffness and ultimate bearing capacity of T beam strengthened by TRC can be increased significantly, and the ultimate bearing capacity of T beam strengthened by TRC can be increased by 24. 4%, but the ductility of the structure is reduced by strengthening the structure. The theoretical calculation of ultimate bearing capacity of T beam strengthened by TRC is carried out. The fiber bundle is regarded as a linear elastic material before reaching the ultimate strength, and the calculated results are in good agreement with the experimental values.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.72

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