【作者】 曾德光；

【导师】 张继文；

【作者基本信息】 东南大学 ， 减灾防灾工程， 2005， 硕士

【摘要】 钢筋混凝土作为一种优良的传统建筑材料被广泛应用于现代工程结构中,而处在恶劣环境中的钢筋混凝土结构(如在沿海建筑、桥梁结构等)则在耐久性方面存在一些问题;为改良钢筋混凝土这一缺陷,人们在长期的工程实践中总结出了各种方法和对策,但其效果不甚理想。但是,新型纤维增强复合材料筋(简称FRP筋)混凝土结构,以FRP筋独特的耐腐蚀性能和高强度等优势,迅速成为了全球土木工程界的研究热点之一。为了进一步了解FRP筋混凝土结构的受弯特性,本文对5根CFRP筋混凝土简支梁和4根AFRP筋混凝土简支梁的受弯性能进行了试验研究。在试验研究中,主要考虑了FRP筋配筋率对梁破坏情况的影响,测试了试件的开裂荷载、裂缝的开展、各级荷载下FRP筋的应变以及试件的极限荷载,验证了平截面假定,分析了挠度变化的特性。在试验研究的基础上,给出了FRP筋混凝土梁的极限承载力、最小配筋率、抗裂度和刚度的计算方法;并将计算结果与试验实测结果进行了对比,表明本文所提出的计算方法是可行的。本文最后根据FRP筋混凝土受弯构件的特性,提出了以抗裂度为控制并考虑承载能力的设计方法;给出了不同配筋率下构件的设计承载能力计算公式及“抗裂度控制临界配筋率”的计算方法。更多还原

【Abstract】 As a traditional eminent building material, steel-reinforced concrete is widely using in modern structure. However, despite this, the problem of poor durability still exists in the steel-reinforced concrete structure in atrocious environment. For this reason, various countermeasures have been studied, but they don’t prove satisfying. Now the FRP-tendon-reinforced concrete becomes one of the researching hotspot in the world wide because of FRP tendon’s preferable durability in corrosive environment and its high strength.Aimed at finding out the Flexural Behavior, four simple-supported beams reinforced with AFRP bars and five ones reinforced with CFRP bars have been tested in static load experiment. The ratio’s effect on breaking modality was concerned in this experiment, involving the cracking load, the development of crack, the assuming plane sections remaining plane, load-deflection curve, the development of strain of AFRP reinforcement, and ultimate load.Based on the experiment research, a method to calculate the bearing capacity is put forward involving the formula to calculate minimum ratio, the formula to calculate the anti-crack behavior and one to calculate the stiffness. Compared with the result of experiment, those formulas prove to be effective and accurate.Lastly, based on the characteristic of concrete beams reinforced with FRP tendons, the design method that is controlled by crack resistance capacity and took into account the bearing capacity are produced, involving the formula to calculate the design load of concrete beams reinforced with various ratio FRP bars, the formula to calculate the limit ratio controlled by crack resistance capacity.更多还原