【作者】 王明敏；

【导师】 郑文忠；

【作者基本信息】 哈尔滨工业大学 ， 结构工程， 2008， 硕士

【摘要】 针对环氧类有机粘结胶软化点多介于60℃~80℃,难以保证粘贴碳纤维布加固混凝土结构的抗火要求的问题,我所在的课题组成功研制出耐火极限不低于600℃的碱激发矿渣无机胶凝材料(以下简称碱矿渣胶凝材料),这种无机胶凝材料的力学性能不低于环氧类有机胶。因此,研究用该碱矿渣胶凝材料粘贴碳纤维片材加固钢筋混凝土梁的受力性能具有一定的现实意义。现行的《碳纤维片材加固修复混凝土结构技术规程》(CECS146:2003)以及《混凝土结构加固设计规范》GB 50367-2006中对于用碱矿渣胶凝材料粘贴CFRP布加固混凝土梁的极限承载力的计算方法没有做出说明,对其在正常使用情况下的变形以及裂缝开展情况的计算方法也没有做出相关的阐述。因而需要对这类用碱矿渣胶凝材料粘贴碳纤维片材加固结构受弯构件的承载力、变形以及裂缝情况进行专门的分析与研究。针对上述问题,本文进行了6根用碱矿渣胶凝材料粘贴碳纤维布加固的混凝土梁的试验与研究。主要研究成果如下:(1)证明了用碱矿渣胶凝材料粘贴碳纤维布加固的混凝土梁可以避免碳纤维布与混凝土之间的剥离破坏,表明用碱矿渣胶凝材料粘贴碳纤维布加固混凝土结构构件是可行的。(2)对6根用碱矿渣胶凝材料粘贴碳纤维布加固混凝土梁的试验表明,若合理设计,可使破坏模式呈现受拉纵向钢筋先屈服,然后碳纤维布被拉断和呈现受拉钢筋先屈服,受压边缘混凝土达到极限压应变等两种理想破坏模式。(3)提出了用碱矿渣胶凝材料粘贴碳纤维布加固混凝土简支梁刚度、裂缝宽度、承载力的计算方法。更多还原

【Abstract】 The softening temperature of epoxy resin adhesive is between 60℃and 80℃which can not meet the requirement of fire resistance of concrete structures reinforced by pasting CFRP sheet. The alkali activating slag cement material (AASCM) with the duration of fair resistance of 600℃has been developed by our group , mechanical properties of the AASCM is superior to that of epoxy resin adhesive. So it is of practical significance to do research on the mechanical property of concrete beam reinforced by pasting CFRP sheet with AASCM.The calculation method of ultimate bearing capacity, deformation and growth of crack in serviceability stage for concrete beam reinforced by pasting CFRP sheet with AASCM are not demonstrated in the current《Technical specification for strengthening concrete structures with carbon fiber reinforced polymer laminate》(CECS146:2003) and《Design code for concrete structure》(GB 50367-2006). So it is needed to analyze and investigate the bearing capacity, deformation and crack of concrete flexural members reinforced by pasting CFRP sheet with AASCM.(1) when the concrete beam are reinforced by pasting CFRP sheet with AASCM, the failure of breakaway between FRP and concrete can be avoided. The result shows that using AASCM as adhesive to strengthen concrete is feasible.(2) The result of 6 concrete beams which are reinforced by pasting CFRP sheet with AASCM shows that under reasonable design, two ideal failure modes will be occur: The one is the tensile longitudinal steel bar yields firstly, then CFRP sheet breaks in tension; the other is the tensile longitudinal steel bar yields firstly, then the concrete utmost compressive fiber reaches the ultimate compressive strain.(3) Calculation formulas of stiffness, crack width and carrying capacity of concrete beams reinforced by pasting CFRP sheet with AASCM are established.更多还原