锈蚀钢筋混凝土柱在地震作用下的滞回行为研究
发布时间：2018-07-20 09:50
【摘要】：钢筋混凝土柱中的钢筋锈蚀后,钢筋横截面积减小,钢材力学性能劣化,钢筋与混凝土之间的粘结性能改变,锈蚀产物膨胀还导致混凝土保护层的开裂,这些因素均影响锈蚀钢筋混凝土柱(下称锈蚀柱)的抗弯强度和抗剪强度以及变形能力。当锈蚀柱受到地震力作用时,情况会变得非常复杂,本文重点是研究地震力作用下锈蚀柱的滞回行为,主要内容包括:(1)针对锈蚀柱在压弯剪作用下的滞回行为,规划、设计了一套系列的试验,通过拟静力的试验方法,重点研究了锈蚀率和轴压比的影响。研究中分析对比了锈蚀柱的滞回曲线、骨架曲线、循环刚度、延性以及耗能的变化规律,并且根据所测试的试验数据分别提取了锈蚀柱的弯曲变形、剪切变形以及根部滑移位移三部分影响锈蚀柱总变形的变形分量。(2)考虑往复荷载作用下锈蚀钢筋肋间混凝土的细观损伤,采用理论分析的方法提出了往复荷载作用下筋端锚固区锈蚀钢筋与混凝土粘结-滑移宏观模型,该模型为计算锈蚀柱的根部滑移奠定了基础。(3)提出了压弯剪作用下锈蚀柱荷载-弯曲变形模型,该模型是由弯曲开裂荷载及开裂弯曲变形、屈服荷载及屈服弯曲变形以及抗弯极限荷载(抗弯强度)及极限弯曲变形所构成的三段线性模型。其中锈蚀柱开裂后弯曲变形模型针对钢筋锈蚀后与混凝土之间的粘结劣化,采用了完好粘结柱与完全无粘结柱之间的线性内插法。该模型与本文试验中所提取的弯曲变形分量对比的结果表明了模型的可行性。(4)提出了压弯剪作用下锈蚀柱荷载-剪切变形模型,该模型是由弯剪斜裂缝开裂荷载及开裂剪切变形、屈服荷载及屈服剪切变形、抗剪极限荷载(抗剪强度)及极限剪切变形所构成的三段线性模型。其中弯剪斜裂缝开裂荷载模型是基于已有的无锈蚀梁弯剪斜裂缝开裂荷载的计算方法,增加考虑了轴向压力和钢筋锈蚀的影响;锈蚀柱抗剪强度模型是基于公认的“梁”“拱”效应和已有混凝土拉-剪临界破坏模型;锈蚀柱屈服剪切变形模型是基于已有无锈蚀柱的屈服剪切变形理论,增加考虑了钢筋锈蚀的影响。该模型与本文试验中所提取的剪切变形分量对比的结果表明了模型的可行性。(5)通过对本文试验结果的拟合,分别提出了锈蚀柱修正后延性系数模型和修正后卸载刚度模型。(6)综合上述模型,本文提出了地震作用下锈蚀柱滞回模型,具体描述为:(1)滞回模型的外包线由两部分组成:一部分是峰值前部分,另一部分是峰值后部分;(2)峰值前部分的变形由弯曲变形、剪切变形和根部滑移位移三部分变形分量线性叠加而成,峰值后部分的变形采用锈蚀柱修正后延性系数模型;(3)卸载刚度采用锈蚀柱修正后卸载刚度模型,再加载刚度采用朝向历史峰值点的规律。通过与本文的试验结果对比,该模型绝大部分偏差均在20%以内,表明本滞回模型在工程中是可行的。
[Abstract]:After the corrosion of steel bar in reinforced concrete column, the cross section area of steel bar decreases, the mechanical properties of steel degrade, the bond property between steel bar and concrete changes, and the expansion of corrosion product also leads to the cracking of concrete protective layer. These factors affect the flexural strength, shear strength and deformation ability of corroded reinforced concrete columns (hereinafter referred to as corroded columns). When the corrosion column is subjected to seismic force, the situation will become very complicated. The emphasis of this paper is to study the hysteretic behavior of the corroded column under seismic force. The main contents include: (1) planning for the hysteretic behavior of the corroded column under the action of compression, bending and shear. A series of tests were designed, and the effects of corrosion rate and axial compression ratio on the corrosion rate and axial compression ratio were studied by pseudostatic test method. The hysteretic curve, skeleton curve, cyclic stiffness, ductility and energy dissipation of the corroded column are analyzed and compared, and the bending deformation of the corroded column is extracted according to the measured experimental data. Shear deformation and root slip displacement affect the deformation components of the total deformation of corroded columns. (2) the meso-damage of corroded reinforced intercostal concrete under reciprocating load is considered. Using the method of theoretical analysis, a macroscopic model of bond slip between corroded steel bar and concrete in Anchorage zone of reinforcement end under reciprocating load is proposed. The model lays a foundation for the calculation of root slip of corroded columns. (3) A load-bending deformation model of corroded columns under the action of compression bending and shear is proposed. The model is composed of bending cracking load and cracking bending deformation. The three-segment linear model composed of yield load, yield bending deformation, bending ultimate load (flexural strength) and ultimate bending deformation. The model of bending deformation of corroded column after cracking aims at bond deterioration between corroded steel bar and concrete, and linear interpolation method between perfectly bonded column and completely unbonded column is adopted. The comparison between the model and the bending deformation components extracted in this paper shows the feasibility of the model. (4) the load-shear deformation model of corroded columns under the action of compression, bending and shear is proposed. The model is a three-segment linear model composed of cracking load and cracking shear deformation, yield load and yield shear deformation, ultimate shear load (shear strength) and ultimate shear deformation. The cracking load model of bending shear slant crack is based on the existing calculation method of bending shear crack load of non-rusting beam, and the influence of axial pressure and steel bar corrosion is taken into account. The shear strength model of corroded columns is based on the generally accepted "beam" arch "effect and the existing concrete tension-shear critical failure model, and the yield shear deformation model of corroded columns is based on the theory of yield shear deformation of non-corroded columns. The effect of reinforcement corrosion is taken into account. The results of comparison between the model and the shear deformation components extracted in this paper show the feasibility of the model. (5) by fitting the experimental results in this paper, The modified ductility coefficient model and the modified unloading stiffness model are presented respectively. (6) based on the above models, the hysteretic model of the corroded column under earthquake action is proposed. The details are as follows: (1) the envelope of the hysteretic model consists of two parts: one is the first part of the peak, the other part is the part after the peak, (2) the deformation of the front part of the peak is distorted by bending, The deformation components of the three parts of shear deformation and root slip displacement are linear superimposed, the deformation of the post-peak part is based on the modified ductility coefficient model of corroded column, (3) the unloading stiffness model is modified by corroded column, The reloading stiffness adopts the law of the historical peak point. Compared with the experimental results in this paper, most of the deviations of the model are less than 20%, which indicates that the hysteretic model is feasible in engineering.
【学位授予单位】：上海交通大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU375.3
本文编号：2133151
[Abstract]:After the corrosion of steel bar in reinforced concrete column, the cross section area of steel bar decreases, the mechanical properties of steel degrade, the bond property between steel bar and concrete changes, and the expansion of corrosion product also leads to the cracking of concrete protective layer. These factors affect the flexural strength, shear strength and deformation ability of corroded reinforced concrete columns (hereinafter referred to as corroded columns). When the corrosion column is subjected to seismic force, the situation will become very complicated. The emphasis of this paper is to study the hysteretic behavior of the corroded column under seismic force. The main contents include: (1) planning for the hysteretic behavior of the corroded column under the action of compression, bending and shear. A series of tests were designed, and the effects of corrosion rate and axial compression ratio on the corrosion rate and axial compression ratio were studied by pseudostatic test method. The hysteretic curve, skeleton curve, cyclic stiffness, ductility and energy dissipation of the corroded column are analyzed and compared, and the bending deformation of the corroded column is extracted according to the measured experimental data. Shear deformation and root slip displacement affect the deformation components of the total deformation of corroded columns. (2) the meso-damage of corroded reinforced intercostal concrete under reciprocating load is considered. Using the method of theoretical analysis, a macroscopic model of bond slip between corroded steel bar and concrete in Anchorage zone of reinforcement end under reciprocating load is proposed. The model lays a foundation for the calculation of root slip of corroded columns. (3) A load-bending deformation model of corroded columns under the action of compression bending and shear is proposed. The model is composed of bending cracking load and cracking bending deformation. The three-segment linear model composed of yield load, yield bending deformation, bending ultimate load (flexural strength) and ultimate bending deformation. The model of bending deformation of corroded column after cracking aims at bond deterioration between corroded steel bar and concrete, and linear interpolation method between perfectly bonded column and completely unbonded column is adopted. The comparison between the model and the bending deformation components extracted in this paper shows the feasibility of the model. (4) the load-shear deformation model of corroded columns under the action of compression, bending and shear is proposed. The model is a three-segment linear model composed of cracking load and cracking shear deformation, yield load and yield shear deformation, ultimate shear load (shear strength) and ultimate shear deformation. The cracking load model of bending shear slant crack is based on the existing calculation method of bending shear crack load of non-rusting beam, and the influence of axial pressure and steel bar corrosion is taken into account. The shear strength model of corroded columns is based on the generally accepted "beam" arch "effect and the existing concrete tension-shear critical failure model, and the yield shear deformation model of corroded columns is based on the theory of yield shear deformation of non-corroded columns. The effect of reinforcement corrosion is taken into account. The results of comparison between the model and the shear deformation components extracted in this paper show the feasibility of the model. (5) by fitting the experimental results in this paper, The modified ductility coefficient model and the modified unloading stiffness model are presented respectively. (6) based on the above models, the hysteretic model of the corroded column under earthquake action is proposed. The details are as follows: (1) the envelope of the hysteretic model consists of two parts: one is the first part of the peak, the other part is the part after the peak, (2) the deformation of the front part of the peak is distorted by bending, The deformation components of the three parts of shear deformation and root slip displacement are linear superimposed, the deformation of the post-peak part is based on the modified ductility coefficient model of corroded column, (3) the unloading stiffness model is modified by corroded column, The reloading stiffness adopts the law of the historical peak point. Compared with the experimental results in this paper, most of the deviations of the model are less than 20%, which indicates that the hysteretic model is feasible in engineering.
【学位授予单位】：上海交通大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU375.3
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