【作者】 周婷；

【导师】 卢亦焱；

【作者基本信息】 武汉大学 ， 结构工程， 2004， 硕士

【摘要】 粘贴碳纤维增强塑料(CFRP)与外粘钢板两种加固修补混凝土结构技术在日益广泛的加固工程应用中逐渐成熟，但两者在改善结构受力性能上均存在一定的不足之处。基于两者的互补性，本文在湖北省重点科学技术发展计划资助项目及中国博士后科学基金资助项目的资助下，考虑采用碳纤维与钢板复合的方式加固钢筋混凝土结构。本文通过对复合加固钢筋混凝土梁抗弯性能试验数据的系统分析，对复合加固梁抗弯性能进行较为深入的研究，较系统地建立了适合复合加固钢筋混凝土梁正截面受力性能的理论计算体系。 本文在对15根钢筋混凝土梁的抗弯性能试验研究中，考虑的影响复合加固效果的因素主要包括：混凝土强度、纵筋配筋率、碳纤维布用量、钢板用量、锚固方式等。试验结果表明：碳纤维与钢板复合加固钢筋混凝土受弯构件能有效地提高了截面承载力，约束了裂缝的发展，提高刚度；在截面延性方面，其比普通钢筋混凝土受弯构件有所降低，与单纯用CFRP加固的构件延性较为接近，一般能满足构件的截面延性要求；另外，试验梁中采用的U型钢板箍较好地防止了梁中剥离破坏的发生。 根据复合方式加固下的钢筋混凝土梁在试验过程中表现的受力特点，本文提出了复合加固梁正截面抗弯承载力的实用计算方法，分析了复合加固梁的截面刚度及延性的变化过程，并建立了相应的理论计算公式，计算结果与试验结果吻合较好。根据试验梁中出现的加固层剥离的早期破坏现象，对复合加固梁剥离破坏机理进行初步探讨，建议了在复合加固方式中CFRP的最小锚固长度及相应的相当变刚度梁的变形计算式。更多还原

【Abstract】 The Carbon Fiber Reinforced Plastic (CFRP) has been applied in the existing structure reinforcement as an alternative to traditional strengthening materials. Though CFRP has a lot of advantages of improving the structure’s mechanical performance ,it behaves in a sort lack at some aspects such as ductility .Another strengthening material-steel plate can fetch up the CFRP’s demerit .For the mutual supplementary capability of the two materials .financed cooperatively by the grant from key Science and Technology Development Project of HuBei Province and the Postdoctor Fund of National Science Foundation of China,connected with the analysis methods of modern steel reinforced concrete structure, the thesis studies the flexural performance of Reinforced Concrete beam composite rehabilitation with bonded CFRP and steel plate through the systematic study on experimental data got from this kind of beams. Systematically establishes the theoretical calculating system of flexural performance of composite rehabilitation RC beams in cooperation with the up-to-date analytical methods for reinforced concrete which suits the properties of the composite reinforced beams.In the paper, fifteen reinforced concrete test specimens were used to study the ultimate bond load .The effect of concrete strength, reinforcement ratio, the dosage of CFRP and steel plate were taken into consideration. Experimental results indicate that: the CFRP and steel plate composite rehabilitation methods can effectively improving the load capacity of RC beams, restricting the development of exsiting crack, enhancing section stiffness; As to the ductility, the composite rehabilitation RC beam’s is lower than that of RC beam, but it is close to the CFRP rehabilitation reinforced concrete beam’s,and it can satisfy the requirement of section ductility commonly;In addition,.by using U style steel plate hoop anchorage system ,sudden debonding failure can be avoided.Based on the mechanical performance of composite rehabilitation RC beams, the method for calculating the normal section flexural load-bearing capacity is proposed, which can meet Chinese engineering requirements. Analyzing the variational process of the stiffness and ductility performance, and establishing the formulae accordingly, the caculating value can match the test one well. According the debonding phenomena of the strengthening layer, the failure mechanism of the composite rehabilitation is probed. The shortest bolt length of CFRP in composite rehabilitation is suggested as well as the computation formula for the deformation of the beams.更多还原