【作者】 康侃；

【导师】 张鹏；

【作者基本信息】 广西工学院 ， 结构工程， 2012， 硕士

【摘要】 现阶段我国正经历着经济快速发展的一个时期，由于经济的快速发展，对建筑物的使用功能、寿命都提出了更高的要求。对于建国后建造的大量建筑物已经接近或到了使用寿命的时间，为了延长使用寿命和提高使用安全性，就必须进行加固维修；同时，许多新建建筑由于建造阶段可能发生的设计疏忽和施工失误，正常使用阶段可能出现的自然和人为灾害，已经无法满足正常使用的要求，影响了结构的耐久性，也必须进行加固维修。而传统的加固手段由于存在着各种不同的缺陷和应用局限，在近二十多年来，工程技术人员逐渐将目光转移到使用新型复合材料对建筑物进行加固维修。在CFRP板上施加预应力来加固工程结构是现加固领域中的一个新技术，CFRP板具有优良的高强性能和耐久性能，在许多领域得到了应用，通过在受弯构件两端安装锚具对CFRP板施加预应力，能够充分的发挥CFRP板的高强特性，改善受弯构件使用阶段的受力性能，提高承载力，防止CFRP板出现剥离破坏并减小应力滞后。本文结合广西自然科学基金项目，对预应力CFRP板加固混凝土受弯构件进行了试验研究，进行了以下几方面的研究工作：1．参与设计了预应力CFRP板夹片式锚具和一套完整的张拉体系，并运用于本次试验研究中。2．在课题组自主研发的预应力CFRP板锚具的基础上，通过张拉CFRP板并分别使用粘结和无粘结加固方式进行了6根混凝土梁试验，研究了施加不同的预应力和不同跨度对加固梁的抗弯性能的影响，并对试验加固梁的极限承载能力、截面应变、CFRP应变和跨中挠度等进行了研究。3．在试验结果的基础上进行了预应力CFRP板加固混凝土受弯构件的理论分析，分别给出了预应力CFRP板粘结和无粘结加固混凝土受弯构件时的预应力损失计算公式、承载力计算公式、开裂荷载计算公式和挠度计算公式，计算结果与试验结果吻合较好，为今后的工程应用提供了参考。更多还原

【Abstract】 At present, China’s economy is in a period of rapid development. With therapid and sustainable development of the national economy and gradualimprovement of people’s living standards, people put forward higher requirementson the quality and functionality of various buildings. Because a large number ofbuildings constructed since the founding of new China are close to the end of servicelife, the buildings shall be reinforced and repaired so as to prolong the service lifeand improve the operation security; meanwhile, many new buildings may not meetthe requirements of normal use and affect the structural durability due to the designnegligence and construction errors that may occur in the construction phase, ornatural and man-made disasters that may appear in the service stage, so the buildingsmust also be reinforced and repaired. The traditional means of reinforcement havedifferent defects and limitations, so people gradually shift attention to the use of newcomposite materials on the reinforcement and repair of buildings in the past20years.The use of prestressed CFRP plates in the reinforcement of structural membersis a new direction in the reinforcement field in recent years. CFRP plates haveexcellent high-strength performance and durability, with broad application prospects.The prestress applied on CFRP plates by installing anchorage on both ends of thestructural elements can bring high-strength characteristics of CFRP plates into fullplay, can improve the mechanical properties of structural members in the servicestage, can improve the bearing capacity, and can prevent the debonding of CFRPplates and reduce the stress hysteresis.In this paper, combined with the Guangxi Natural Science Fund Project, thetests and researches were made on the concrete flexural members reinforced byprestressed CFRP plates, and the following aspects of research work were made:1. The CFRP plate wedge-type mechanical anchorage and its completetensioning system with engineering application values were developed to promote itsdevelopment towards engineering applications.2. Based on the anchorage for prestressed CFRP plates developed by theresearch group, six concrete beams with tensioned CFRP plates in the form of bonded and unbonded reinforcement were tested, the impact of different prestressesand spans on the flexural properties of reinforced beams was studied, and theultimate bearing capacity, cross-section strain, CFRP strain and midspan deflectionof the reinforced beams were studied.3. Based on the test results, the theoretical analyses of the concrete flexuralmembers reinforced by prestressed CFRP plate were made, the prestressing lossformula, bearing capacity formula, cracking load formula and deflection formula ofthe bonded and unbonded concrete flexural members reinforced by prestressedCFRP plates were given respectively. The calculated results agreed well with theexperimental results, which can provide references for future engineeringapplications.更多还原