GFRP-螺旋箍筋复合约束混凝土抗冲击性能试验研究

发布时间：2018-04-10 13:51

本文选题：FRP + GFRP套管　；参考：《湖南大学》2015年硕士论文

【摘要】：近年来,纤维增强复合材料(Fiber Reinforced Plastics/Polymers,简称FRP),因其高比强度、良好的耐腐蚀性等优势成为土木工程界炙手可热的新型材料,因其施工便捷,近年来被广泛应用于城市基础设施以及桥梁等结构的修补、加固,并寄望应用于结构抗震及结构抗爆、抗冲击领域,然而,FRP约束混凝土在爆炸及冲击荷载作用下的性能研究目前还处在初级阶段,面对频频发生的因爆炸、冲击致使结构失效的事件,针对FRP约束混凝土抗冲击性能的研究变得十分必要。FRP是一种线弹性材料,破坏呈脆性,这对于结构抗震及抗冲击都十分不利,玻璃纤维管-螺旋箍筋复合约束混凝土是一种复合结构,由螺旋箍筋(Steel Spiral reinforcement,简称SR)约束混凝土及其外部玻璃纤维(Glass Fiber Reinforced Plastics/Polymers,简称GFRP)管组成,这是一种很有发展前景的复合材料,其优点包括:可在提高GFRP套管结构塑性性能的同时提高SR的抗腐蚀能力,预制的GFRP套管既可为核心混凝土提供约束也可作为浇筑混凝土的模板,同时也保护内部结构不受到外部恶劣环境影响。本文在前人所做关于FRP-横向钢筋复合约束混凝土在静载、冲击荷载作用下的力学性能研究及FRP约束混凝土、钢筋混凝土基本力学性能基础上,采用压力机和湖南大学高性能落锤试验机分别对GFRP-螺旋箍筋复合约束混凝土的静载和冲击力学性能做了试验研究,同时采用理论计算对试验进行了模拟分析。本文主要研究工作包括以下几部分:(1)GFRP-螺旋箍筋复合约束混凝土在静力作用下的试验研究。利用10,000KN刚性压力试验机对12个不同GFRP层数、不同螺旋箍筋体积配筋率的GFRP-螺旋箍筋复合约束混凝土圆柱试件进行轴压试验,得到其在轴向静力作用下的应力-应变曲线,探究三种材料的协同工作特点,分析试验变量对复合约束混凝土受力性能的影响。(2)提出GFRP-螺旋箍筋复合约束混凝土在轴向静载作用下的应力-应变模型,并将模拟结果与试验结果进行对比,分析模型的适用性及试验不足之处。基于18个混凝土强度为C30的GFRP-螺旋箍筋复合约束混凝土试件静载试验结果,提出其应力-应变理论模型,并将模型模拟结果与12个混凝土强度为C40的GFRP-螺旋箍筋复合约束混凝土试件静载试验结果进行对比,分析模型的适用性,同时讨论试验的不足之处。(3)GFRP-螺旋箍筋复合约束混凝土在冲击荷载作用下的试验研究。采用落锤试验机对24个GFRP-螺旋箍筋复合约束混凝土圆柱试件进行轴向冲击荷载试验,得到其冲击应力时程曲线及应变时程曲线,探究三种材料的协同工作特点,探究试验变量对其冲击受力性能的影响。(4)GFRP-螺旋箍筋复合约束混凝土在冲击荷载作用下的理论分析。将冲击试验结果与静载试验结果进行对比,得出强度增大系数,收集整理同类试验结果,探讨冲击能量及约束比对增大系数的影响,同时采用理论强度模型模型试验结果并与试验结果进行对比,分析模型的试用性及试验的不足之处。
[Abstract]:In recent years, fiber reinforced composites (Fiber Reinforced Plastics/Polymers, referred to as FRP), because of its high strength, good resistance to corrosion and other advantages to become the new hot material in the field of civil engineering, because of its convenient construction, has been widely used in city infrastructure and bridge repair, reinforcement, and applied to hope the seismic structure and anti explosion, impact, however, the performance study on the action of the explosion and impact loading of FRP confined concrete is still in the initial stage, in the face of the frequent occurrence of explosion shock, resulting in structural failure events, to study the impact resistance performance of concrete confined by FRP is necessary for.FRP is a linear elastic the material, brittle failure, the structural seismic and shock resistance are very negative, glass fiber tube concrete composite spiral hoop constraint is a kind of composite structure, a spiral The stirrup (Steel Spiral reinforcement, referred to as SR) confined concrete and external glass fiber (Glass Fiber Reinforced Plastics/Polymers, referred to as GFRP) tube, which is a kind of composite material with good prospect of development, its advantages include: can improve the plastic properties of GFRP casing structure and improve the corrosion resistance of SR, GFRP prefabricated casing not only is the core concrete to provide constraints can also be used as a concrete template, but also protect the internal structure from the external adverse environmental impact. Based on the previous work on FRP- transverse reinforcement composite confined concrete under static load, the performance of FRP and mechanical constraints of concrete under impact loading, the basic mechanical properties of reinforced concrete the press, and the Hunan University high performance drop testing machine of concrete composite spiral hoop constraint GFRP- static load and impact mechanical properties The experimental study and calculation were simulated and analyzed by using test theory. The main research work includes the following parts: (1) experimental study under static loads GFRP- compound spiral stirrups confined concrete. On 12 different layers of GFRP using 10000KN rigid pressure testing machine, different volume of spiral hoop reinforcement ratio GFRP- compound spiral stirrups confined concrete cylinder specimens were tested under axial compression, the axial static stress strain curve, collaborative work to explore the characteristic of three kinds of materials, test and analysis of influence of variable composite confined concrete stress performance. (2) proposed the concrete composite spiral hoop in the axial static constraint GFRP- load stress strain model under the action, and the simulation results were compared with the test results, the applicability and shortcomings of the model is analyzed. The test of 18 concrete strength based on C30 GFRP-. The concrete composite specimen rotation constraint stirrup loading test, the stress-strain model and the specimens of static load test results were compared with the simulation results of 12 concrete strength of C40 GFRP- composite spiral stirrup confined concrete, the applicability of the analysis model, and discuss the shortcomings (3 trials.) experimental study under impact load GFRP- spiral stirrup confined concrete composite. The drop testing machine of 24 GFRP- spiral stirrup confined concrete composite cylindrical specimens under axial impact load test, the impact stress time curves and strain time curve, collaborative work to explore the characteristic of three kinds of materials, to explore the impact of performance the test variable force on the impact. (4) theoretical analysis of GFRP- spiral stirrup confined concrete composite under impact load. The results will impact tests and static load test results By comparing the strength increasing coefficient, we collect and sort out the same kind of test results, and discuss the impact of impact energy and restraint ratio on the enlarging coefficient. Meanwhile, the theoretical strength model test results are compared with the experimental results, and the feasibility and the shortcomings of the test are analyzed.

【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU398.9

【参考文献】