钢筋与套管约束CFRP纵筋混合配筋混凝土柱抗震性能研究
发布时间：2018-09-19 07:07
【摘要】：纤维增强复合材料(Fiber-Reinforced Polymer,FRP)筋与传统钢筋相比具有轻质高强、抗疲劳以及耐腐蚀性好等优点,采用FRP筋替代传统钢筋作为混凝土结构的增强材料,使结构不仅具备所需的承载能力与延性,同时具有优良的耐久性,符合未来工程结构的发展方向。虽然FRP筋混凝土柱具有较好的延性与自复位性能,但由于FRP筋属于弹性材料,导致构件及结构的耗能能力较差,在地震荷载作用下可能产生较大的位移响应。对于桥梁结构,墩顶过大的水平位移可能引起上部结构落梁和碰撞的问题。对于建筑结构,较大的层间侧移引起的重力二阶效应可能导致结构的倒塌。为提高FRP筋混凝土柱的耗能能力,混合配筋的概念被提出:即采用FRP筋和普通钢筋一起作为柱的纵筋,利用普通钢筋的屈服来耗能,利用FRP筋的弹性特性来提供较好的屈服后刚度以及较小的残余位移。已有研究表明FRP筋受压时易过早发生屈曲破坏,以致无法充分发挥其抗拉强度高的优势,因此课题组提出了套管约束FRP纵筋的理念,即将FRP筋置于波纹套管内并灌注高强水泥基材料,以期提高FRP筋的材料使用效率。为验证上述理念的可行性及有效性,本文对钢筋与套管约束FRP筋混合配筋混凝土柱的抗震性能开展了系统研究,具体研究内容如下:(1)对套管约束FRP筋的拉、压材性进行了试验研究,包括采用嵌入混凝土法测套管约束FRP筋的抗压性能,以及采用钢管锚固法测其抗拉性能,得到有限元分析时所用的套管约束CFRP筋材性基本力学性能指标;(2)设计并制作了1个普通钢筋混凝土对比件和4个套管约束CFRP筋混凝土柱,试件截面尺寸均为600mm×400mm,悬臂柱高为2400mm,对套管约束CFRP筋混凝土柱抗震性能进行了拟静力试验研究;考察了FRP筋替换钢筋比率、轴压比对试件荷载位移滞回曲线的影响,并采用刚度、强度、能量耗散等参数指标对构件抗震性能进行了系统评价;(3)基于OpenSees有限元分析平台,建立了考虑应变渗透效应的混合配筋柱精细化有限元模型,通过与试验结果对比验证了模拟的准确性,揭示了应变渗透效应的重要影响。通过相关的参数分析,初步得到了FRP筋替换钢筋比、轴压比对残余位移、骨架曲线等的影响规律。
[Abstract]:Fiber reinforced composite (Fiber-Reinforced Polymer,FRP) tendons have the advantages of light weight, high strength, good fatigue resistance and corrosion resistance compared with traditional steel bars. FRP bars are used instead of traditional steel bars as reinforcement materials for concrete structures. The structure not only has the required bearing capacity and ductility, but also has excellent durability, which is in line with the development direction of the future engineering structure. Although FRP reinforced concrete columns have better ductility and self-reposition performance, because FRP tendons belong to elastic materials, the energy dissipation capacity of members and structures is poor, which may result in large displacement response under earthquake load. For the bridge structure, the excessive horizontal displacement of the pier top may cause the problem of falling beam and collision of the superstructure. For the building structure, the gravity second order effect caused by the larger interstory lateral displacement may lead to the collapse of the structure. In order to improve the energy dissipation capacity of concrete columns with FRP bars, the concept of mixed reinforcement is put forward. That is to say, FRP bars and ordinary steel bars are used as the longitudinal reinforcement of the column together, and the yield of ordinary steel bars is used to consume energy. The elastic properties of FRP bars are used to provide better post-yield stiffness and small residual displacement. Previous studies have shown that FRP tendons are prone to premature buckling failure when subjected to compression, which makes them unable to give full play to their high tensile strength. Therefore, the idea of casing constrained FRP longitudinal tendons is put forward by our team. FRP bars are placed in corrugated casings and filled with high strength cement based materials in order to improve the material efficiency of FRP bars. In order to verify the feasibility and validity of the above ideas, the seismic behavior of concrete columns with reinforced concrete reinforced with FRP bars with casing constraints is systematically studied in this paper. The specific contents are as follows: (1) pulling of FRP tendons with casing constraints, The compressive properties of FRP tendons are tested by using the embedded concrete method, and the tensile properties of the bars are measured by the method of steel tube Anchorage. The basic mechanical properties of casing confined CFRP bars used in finite element analysis are obtained. (2) A normal reinforced concrete contrast piece and four cased CFRP reinforced concrete columns are designed and manufactured. The section sizes of the specimens are all 600mm 脳 400mm, and the cantilever column height is 2400mm. The quasi static experimental study on the seismic behavior of concrete columns with CFRP bars confined by casing is carried out, and the effect of the ratio of FRP bars to steel bars and axial compression ratio on the load-displacement hysteretic curves of the specimens is investigated, and the stiffness is adopted. The strength, energy dissipation and other parameters are systematically evaluated. (3) based on the OpenSees finite element analysis platform, the fine finite element model of hybrid reinforced columns considering strain permeation effect is established. The accuracy of the simulation is verified by comparing with the experimental results, and the important influence of strain permeation effect is revealed. Through the analysis of relevant parameters, the influences of the ratio of FRP bars to the replacement of steel bar, the ratio of axial compression to the axial pressure, the residual displacement and the skeleton curve are preliminarily obtained.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9;TU352.11
[Abstract]:Fiber reinforced composite (Fiber-Reinforced Polymer,FRP) tendons have the advantages of light weight, high strength, good fatigue resistance and corrosion resistance compared with traditional steel bars. FRP bars are used instead of traditional steel bars as reinforcement materials for concrete structures. The structure not only has the required bearing capacity and ductility, but also has excellent durability, which is in line with the development direction of the future engineering structure. Although FRP reinforced concrete columns have better ductility and self-reposition performance, because FRP tendons belong to elastic materials, the energy dissipation capacity of members and structures is poor, which may result in large displacement response under earthquake load. For the bridge structure, the excessive horizontal displacement of the pier top may cause the problem of falling beam and collision of the superstructure. For the building structure, the gravity second order effect caused by the larger interstory lateral displacement may lead to the collapse of the structure. In order to improve the energy dissipation capacity of concrete columns with FRP bars, the concept of mixed reinforcement is put forward. That is to say, FRP bars and ordinary steel bars are used as the longitudinal reinforcement of the column together, and the yield of ordinary steel bars is used to consume energy. The elastic properties of FRP bars are used to provide better post-yield stiffness and small residual displacement. Previous studies have shown that FRP tendons are prone to premature buckling failure when subjected to compression, which makes them unable to give full play to their high tensile strength. Therefore, the idea of casing constrained FRP longitudinal tendons is put forward by our team. FRP bars are placed in corrugated casings and filled with high strength cement based materials in order to improve the material efficiency of FRP bars. In order to verify the feasibility and validity of the above ideas, the seismic behavior of concrete columns with reinforced concrete reinforced with FRP bars with casing constraints is systematically studied in this paper. The specific contents are as follows: (1) pulling of FRP tendons with casing constraints, The compressive properties of FRP tendons are tested by using the embedded concrete method, and the tensile properties of the bars are measured by the method of steel tube Anchorage. The basic mechanical properties of casing confined CFRP bars used in finite element analysis are obtained. (2) A normal reinforced concrete contrast piece and four cased CFRP reinforced concrete columns are designed and manufactured. The section sizes of the specimens are all 600mm 脳 400mm, and the cantilever column height is 2400mm. The quasi static experimental study on the seismic behavior of concrete columns with CFRP bars confined by casing is carried out, and the effect of the ratio of FRP bars to steel bars and axial compression ratio on the load-displacement hysteretic curves of the specimens is investigated, and the stiffness is adopted. The strength, energy dissipation and other parameters are systematically evaluated. (3) based on the OpenSees finite element analysis platform, the fine finite element model of hybrid reinforced columns considering strain permeation effect is established. The accuracy of the simulation is verified by comparing with the experimental results, and the important influence of strain permeation effect is revealed. Through the analysis of relevant parameters, the influences of the ratio of FRP bars to the replacement of steel bar, the ratio of axial compression to the axial pressure, the residual displacement and the skeleton curve are preliminarily obtained.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9;TU352.11
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