鋼筋與套管約束CFRP縱筋混合配筋混凝土柱抗震性能研究
發(fā)布時間：2018-09-19 07:07
【摘要】：纖維增強復合材料(Fiber-Reinforced Polymer,FRP)筋與傳統(tǒng)鋼筋相比具有輕質(zhì)高強、抗疲勞以及耐腐蝕性好等優(yōu)點,采用FRP筋替代傳統(tǒng)鋼筋作為混凝土結構的增強材料,使結構不僅具備所需的承載能力與延性,同時具有優(yōu)良的耐久性,符合未來工程結構的發(fā)展方向。雖然FRP筋混凝土柱具有較好的延性與自復位性能,但由于FRP筋屬于彈性材料,導致構件及結構的耗能能力較差,在地震荷載作用下可能產(chǎn)生較大的位移響應。對于橋梁結構,墩頂過大的水平位移可能引起上部結構落梁和碰撞的問題。對于建筑結構,較大的層間側移引起的重力二階效應可能導致結構的倒塌。為提高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筋和普通鋼筋一起作為柱的縱筋,利用普通鋼筋的屈服來耗能,利用FRP筋的彈性特性來提供較好的屈服后剛度以及較小的殘余位移。已有研究表明FRP筋受壓時易過早發(fā)生屈曲破壞,以致無法充分發(fā)揮其抗拉強度高的優(yōu)勢,因此課題組提出了套管約束FRP縱筋的理念,即將FRP筋置于波紋套管內(nèi)并灌注高強水泥基材料,以期提高FRP筋的材料使用效率。為驗證上述理念的可行性及有效性,本文對鋼筋與套管約束FRP筋混合配筋混凝土柱的抗震性能開展了系統(tǒng)研究,具體研究內(nèi)容如下:(1)對套管約束FRP筋的拉、壓材性進行了試驗研究,包括采用嵌入混凝土法測套管約束FRP筋的抗壓性能,以及采用鋼管錨固法測其抗拉性能,得到有限元分析時所用的套管約束CFRP筋材性基本力學性能指標;(2)設計并制作了1個普通鋼筋混凝土對比件和4個套管約束CFRP筋混凝土柱,試件截面尺寸均為600mm×400mm,懸臂柱高為2400mm,對套管約束CFRP筋混凝土柱抗震性能進行了擬靜力試驗研究;考察了FRP筋替換鋼筋比率、軸壓比對試件荷載位移滯回曲線的影響,并采用剛度、強度、能量耗散等參數(shù)指標對構件抗震性能進行了系統(tǒng)評價;(3)基于OpenSees有限元分析平臺,建立了考慮應變滲透效應的混合配筋柱精細化有限元模型,通過與試驗結果對比驗證了模擬的準確性,揭示了應變滲透效應的重要影響。通過相關的參數(shù)分析,初步得到了FRP筋替換鋼筋比、軸壓比對殘余位移、骨架曲線等的影響規(guī)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.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：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.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU398.9;TU352.11
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