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1、.膄薈蚄螁芇蒁薀螁荿蚆衿螀聿葿螅蝿膁蚅蚁螈芃蒇薇袇莆芀袅袆肅蒆袁袆芈芈螇袅莀薄蚃袄肀莇蕿袃膂薂袈袂芄莅螄羁莆薁蚀羀肆莃薆羀膈蕿蒂罿莁莂袀羈肀蚇螆羇膃蒀蚂羆芅蚅薈羅莇蒈袇肄肇芁螃肄腿蒇虿肃节艿薅肂肁蒅薁肁膄莈衿肀芆薃螅聿莈莆蚁肈肈薁薇膈膀莄袆膇节薀螂膆莅莃蚈膅膄薈蚄螁芇蒁薀螁荿蚆衿螀聿葿螅蝿膁蚅蚁螈芃蒇薇袇莆芀袅袆肅蒆袁袆芈芈螇袅莀薄蚃袄肀莇蕿袃膂薂袈袂芄莅螄羁莆薁蚀羀肆莃薆羀膈蕿蒂罿莁莂袀羈肀蚇螆羇膃蒀蚂羆芅蚅薈羅莇蒈袇肄肇芁螃肄腿蒇虿肃节艿薅肂肁蒅薁肁膄莈衿肀芆薃螅聿莈莆蚁肈肈薁薇膈膀莄袆膇节薀螂膆莅莃蚈膅膄薈蚄螁芇蒁薀螁荿蚆衿螀聿葿螅蝿膁蚅蚁螈芃蒇薇袇莆芀袅袆肅蒆袁袆芈芈螇袅莀薄蚃袄肀莇蕿
2、袃膂薂袈袂芄莅螄羁莆薁蚀羀肆莃薆羀膈蕿蒂罿莁莂袀羈肀蚇螆羇膃蒀蚂羆芅蚅薈羅莇蒈袇肄肇芁螃肄腿蒇虿肃节艿薅肂肁蒅薁肁膄莈衿肀芆薃螅聿莈莆蚁肈肈薁薇膈膀莄袆膇节薀螂膆莅莃蚈膅膄薈蚄螁芇蒁薀螁荿蚆衿螀聿葿螅蝿膁蚅蚁螈芃蒇薇袇莆芀袅袆肅蒆袁袆芈芈螇袅莀薄蚃袄肀莇蕿袃膂薂袈袂芄莅螄羁莆薁蚀羀肆莃薆羀膈蕿蒂罿莁莂袀羈肀蚇螆羇膃蒀蚂羆芅蚅薈羅莇蒈袇肄肇芁螃肄腿蒇虿肃节艿薅肂肁蒅薁肁膄莈衿肀芆薃螅聿莈莆蚁肈肈薁薇 闭合预应力钢丝绳论文：闭合预应力钢丝绳加固RC梁抗剪性能试验研究【中文摘要】闭合预应力钢丝绳(Prestressed Closed Wire rope Units, PCWRU)加固是一种新型的抗剪
3、加固方法,能显著提高梁的极限抗剪承载力,明显改善构件变形能力和延性,在既有建筑结构加固中具有广泛应用前景。本文以实际框架梁为模型,主要开展了以下三个方面的研究:(1)锚具的开发与性能试验研究;(2)闭合预应力钢丝绳加固RC梁抗剪性能试验研究;(3)结合理论模型和试验结果,推导了闭合预应力钢丝绳加固RC梁抗剪承载力计算公式。共研制了6种不同形式的锚具,研究参数主要包括几何尺寸、构造形式和槽道形式。研究表明,相同尺寸下,异形锚具锚固效果较好,滑移小。与其它形式的锚具相比,波浪形锚具能明显改善对钢丝绳的损伤程度,总体锚固效果最佳,可作为闭合预应力钢丝绳锚固形式应用于工程加固。开展了5个利用预应力钢丝
4、绳箍加固RC梁和一个对比试件抗剪性能试验。主要研究参数包括配绳率、预应力度和锚固形式,锚固形式包括波浪形和普通卡头锚固两种。研究结果表明,预应力钢丝绳箍可显著提高构件的极限承载力,明显改善试件的变形能力和延性。试件抗剪承载力随配绳率和预应力度变化不同,配绳率提高,承载力提高;预应力度增大,承载力先提高后下降。两种不同锚固形式对试件加固效果影响不明显。综合试验现象和试验结果,采用经典理论模型,分析了钢丝绳箍加固后受剪机理。考虑配绳率、预应力度的影响,提出了闭合应力钢丝绳加固RC梁抗剪承载力计算公式,计算结果与试验结果总体吻合良好。【英文摘要】As new strengthening techno
5、logy, prestressed closed wire rope units(PCWRU) strengthening can effectively enhance the shear capacity, deformation capacity and ductibility of RC beam, and it exhibits wide prospect in the field of structural rehabilitation. In order to study the engreening application of PCWRU technology, follow
6、ing studies were carried out: (1) Experimental researches on developing anchorage and their property were carried out; (2) RC beams retrofitted by PCWRU were tested under shear load; (3) Combining the truss model and tested results, formulas to calculate the ultimate shear bearing capacity of RC bea
7、ms retrofitted by PCWRU were proposed.Six different types of anchorage were developed, and the parameters included geometries, cofigurations and groove types. Test results show heteromorphic-groove anchorages have better anchoring property and less slip while in the same geometry. Compared with the
8、other anchorages, and undee anchorage can alleviate the damage degree effectively to wire rope units and have the best anchoring effect. So it could be applied in the PCWRU strengthening.Researches on five specimens retrofitted by PCWRU and one control specimen of RC beam were carried out, and the p
9、arameters were ratio of wire rope units, prestress level and anchoring type including undee anchorage and holding fixture anchoring. Test restults show PCWRU could enhance the ultimate shear capacity of specimens significantly, as well as deformation capacity and ductibility. Shear capacity changes
10、differently following the wire ratio and the prestress level, the shear capacity goes up as the wire ratio increases, while it goes up and then down as the prestress level increases.Two different anchoring systems have little effect on the retrofitting effect. Based on phenomenons and results of the
11、 test, using classic truss model, the shear resistant mechanism retrofitted by PCWRU was analysed. Considering the effect of wire ratio and prestress level, formulas were proposed to calculate the ultimate shear capacity, and the calculated results show good agreement with the tested ones.【关键词】闭合预应力
12、钢丝绳 抗剪加固 混凝土梁 试验研究 抗剪承载力 受剪机理 桁架模型【英文关键词】prestressed closed wire rope units shear retrofit reinforced concrete beam experimental study shear capacity shear resistant mechanism truss model【目录】闭合预应力钢丝绳加固RC梁抗剪性能试验研究 摘要 4-5 ABSTRACT 5 第一章 绪论 8-20 1.1 概述 8 1.2 抗剪加固背景 8-10 1.3 混凝土结构常用加固方法简介 10-121.3.1 直接加
13、固法 10-11 1.3.2 间接加固法 11-12 1.4 混凝土（RC）梁抗剪加固综述 12-17 1.4.1 增强复合纤维加固法 12-14 1.4.2 粘贴加固法 14-16 1.4.3 其它加固方法 16-17 1.4.4 传统梁加固方法存在的问题 17 1.5 钢丝绳加固梁抗剪性能研究现状及存在的问题 17-20 1.5.1 钢丝绳材料概述 17-18 1.5.2 钢丝绳加固梁抗剪性能研究现状 18-19 1.5.3 钢丝绳加固梁抗剪性能研究存在的问题 19-20 第二章 预应力锚具性能实验研究 20-26 2.1 引言 20 2.2 预应力钢丝绳锚具性能试验研究 20-24 2.
14、2.1 夹板锚具锚固性能试验研究 21-232.2.2 普通卡头锚固性能试验研究 23-24 2.3 锚具受力性能理论分析 24-25 2.4 小结 25-26 第三章 闭合预应力钢丝绳加固 RC 梁抗剪性能试验研究 26-60 3.1 试件设计及制作 26-32 3.1.1 试件尺寸和试验参数 26-29 3.1.2 材料力学性能 29-30 3.1.3 加固方案 30-32 3.2 闭合预应力钢丝绳加固法施工工艺 32-36 3.2.1 加固前期准备工作 32-33 3.2.2 加固施工工艺 33-36 3.3 试验装置及量测方案 36-38 3.3.1 试验装置 36-37 3.3.2
15、加载制度 37 3.3.3 量测方案 37-38 3.4 试验过程及现象分析 38-53 3.4.1 试件破坏过程及特征 38-45 3.4.2 应变量测结果与分析 45-53 3.5 极限承载力及变形分析 53-59 3.5.1 承载力分析 55 3.5.2 变形分析 55-56 3.5.3 承载力与变形能力影响因素分析 56-59 3.6 小结 59-60 第四章 闭合预应力钢丝绳加固 RC 梁受剪机理及公式推导 60-74 4.1 闭合预应力钢丝绳加固RC 梁受剪机理 60-66 4.1.1 桁架理论模型 60-62 4.1.2 桁架-拱模型 62-65 4.1.3 极限平衡理论 65-
16、66 4.2 闭合预应力钢丝绳抗剪承载力理论分析 66-71 4.2.1 钢丝绳加固梁破坏机理 66-67 4.2.2 闭合预应力钢丝绳加固RC 梁抗剪承载力公式推导与计算 67-71 4.3 公式理论与试验结果对比 71-73 4.4 小结 73-74 第五章 结论与建议 74-77 5.1 主要结论 74-75 5.2 问题与建议 75-77 参考文献 77-81 个人简介 81-82 致谢 82 莆莈薂肄莅薀螈肀莄蚃蚀羆莃莂袆袂罿蒅虿螈罿薇袄肇羈芇蚇羃肇荿袃衿肆蒁蚅螅肅蚄蒈膃肄莃螄聿肃蒆薆羅肃薈螂袁肂芈薅螇肁莀螀肆膀蒂薃羂腿薄蝿袈膈芄薁袄膇蒆袇螀膇蕿蚀肈膆芈袅羄膅莁蚈袀膄蒃袃螆芃薅蚆肅节
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