【作者】 曹俊；

【导师】 王志浩；

【作者基本信息】 清华大学 ， 土木工程， 2004， 硕士

【摘要】 近年来,高强不锈钢绞线网-聚合砂浆加固法在我国的加固工程领域内逐步得到广泛地应用。这种加固技术具有强度高、耐久性好、施工方便等优点,具有广阔的应用前景。钢绞线网-聚合砂浆粘结锚固性能在很大程度上影响到加固或修补的整体效果。本论文主要研究聚合砂浆与混凝土之间的粘结性能以及钢绞线在聚合砂浆中的粘结锚固性能。通过常规的劈拉试验和推剪试验,研究聚合砂浆与混凝土之间的粘结劈拉强度和粘结剪切强度,总结其粘结性能,并与普通的新老混凝土之间的粘结性能作比较。共有9个混凝土与聚合砂浆的粘结劈拉试件、9个混凝土整体劈拉试件、3个砂浆整体劈拉试件,根据试验结果,论文给出了混凝土与砂浆粘结的劈拉强度回归公式。由9个推剪试件的试验结果,找出了相应条件下的推剪强度值。通过常规的拉拔试验,研究了钢绞线在聚合砂浆中的粘结锚固性能。分为单根钢丝拉拔试验和钢绞线拉拔试验两部分,作了18根单丝在聚合砂浆中的拉拔试验和两组共24根钢绞线在聚合砂浆中的拉拔试验。通过对试验数据的分析,总结出了钢绞线在聚合砂浆中的粘结锚固特性,并给出了基本锚固长度的建议计算公式。论文的另一部分重要工作是9根钢绞线网-聚合砂浆加固混凝土简支梁的粘结锚固试验。在保证钢绞线在聚合砂浆中充分锚固的前提下,改变聚合砂浆加固层分割段的粘结长度,分析加固层与混凝土梁体之间的粘结性能和粘结破坏形态,找出了在常规混凝土强度和聚合砂浆强度下,加固层的最小粘结长度。论文还分别采用手工弹性计算和ANSYS软件计算粘结面的应力,得到粘结面剥离荷载,与试验结果基本吻合。根据试验分析结果,对该技术的加固设计提出了建议。论文成果为今后进一步研究高强不锈钢绞线网-聚合砂浆加固技术和加固工程的设计工作给出有参考价值的意见。更多还原

【Abstract】 The strengthening technology with high strength stainless steel wire mesh and polymer mortar has been widely used in strengthening engineering field in recent years. This technology, which has many advantages, such as high strength, excellent durability, and convenient construction, could be variously used in many areas. The adhesive performance between concrete and polymer mortar and the bond performance of steel weirs anchoring in the mortar, to a great extent, affect the integrated reinforced effect. This thesis mainly studies the adhesive performance between concrete and polymer mortar and the bond performance of steel weirs anchoring in the mortar.Through normal splitting tensile experiment and shearing experiment, this thesis has researched the adhesive splitting tensile and shearing strength between concrete and polymer mortar, summarized the adhesive performance, and compared with new-old concrete. There are 9 concrete-mortar splitting tensile samples, 9 concrete ones and 9 mortar ones. Through the experiment data, the adhesive splitting tensile strength formula of concrete-mortar and adhesive shearing strength are found. At the same time this thesis has studied high-strength steel wire’s bonding performance when anchoring in the polymer mortar through tensile experiment. There are two parts separately study the single wire and a bundle of wires, with 18 single wires and 24 steel wires anchoring in the mortar. Through discussing about the data of experiments and summarizing the character of the bonding behavior, the calculating formula of anchorage length is found.Another important part of work is having a research on the bond anchorage experiment of 9 strengthened beams with high-strength steel wire mesh. Under the precondition to ensure the sufficient anchorage of steel wires <WP=5>in polymer mortar, changing the bonding length of the layer for the reinforced beam, the thesis has studied bond performance and bonding failure between bonding layer and concrete beam. The minimum bonding length is found under common concrete and polymer mortar strength. The bonding failure force is found by hand calculation and ANSYS calculation. Basing on analyzing the result of experiment, some suggestions for this strengthening technology are provided in the thesis.This thesis provides the basis for the design in actual construction and the further study of stainless steel wire mesh strengthening technology.更多还原