预应力碳纤维条带加固混凝土圆柱地震损伤性能研究

发布时间：2018-06-23 04:57

本文选题：混凝土圆柱 + 预应力碳纤维条带　；参考：《北京交通大学》2013年硕士论文

【摘要】：摘要：我国是地震灾害最严重的国家之一。为有效减少人员伤亡和经济损失,对现有安全性、可靠性不满足规范要求的结构进行抗震加固显得尤为重要。传统碳纤维条带(Carbon Fiber Reinforced Polymer,以下简写为CFRP)加固混凝土圆柱技术存在应力滞后问题,而预应力CFRP加固混凝土圆柱能够对核心混凝土施加主动约束,充分发挥CFRP材料的高强性能,避免CFRP的应力滞后,从而得到更好的加固效果。基于位移的抗震设计方法能够给结构抗震设计、开展未来震害预测和现有结构评估提供有效依据,已被世界大多数国家所认可。这一方法的核心就是建立结构的损伤评估模型,定量计算结构在地震过程中的损伤指标。目前对基于位移抗震设计方法的研究主要集中于普通钢筋混凝土结构,对预应力CFRP加固后的结构损伤模型鲜有人研究。本课题进行了预应力CFRP主动约束混凝土圆柱的试验研究、主动约束机理分析,建立了预应力CFRP主动约束情况下混凝土圆柱的损伤模型,以指导实际工程。具体内容包括： (1)通过对预应力CFRP加固混凝土圆柱在低周往复荷载作用下抗震性能试验研究,分析了在CFRP主动约束下,混凝土圆柱的损伤破坏机理。 (2)基于前期低周往复荷载作用下CFRP加固钢筋混凝土圆柱抗震性能试验的数据,建立预应力CFRP加固后钢筋混凝土圆柱的损伤模型。 (3)参照我国规范及现有研究成果,确定预应力CFRP加固钢筋混凝土圆柱的5个抗震性能等级划分标准。 (4)利用有限元软件ABAQUS对预应力CFRP加固混凝土圆柱在低周往复荷载作用及单调加载作用下分别进行有限元模拟,将有限元模拟得到的荷载一位移曲线、骨架曲线与试验结果进行比较,从而验证数值模型的合理性和可靠性。并使用有限元分析结果对本文所建立损伤模型及抗震性能等级划分标准进行验证,计算出的损伤指标基本符合试验结果,证明了该损伤模型及等级划分的合理性。
[Abstract]:Abstract: China is one of the countries with the most serious earthquake disaster. In order to effectively reduce casualties and economic losses, it is particularly important to strengthen structures which are safe and reliable, which do not meet the requirements of the code. Traditional carbon Fiber reinforced Polymer (CFRP) technique for strengthening concrete columns has the problem of stress hysteresis, and prestressed CFRP reinforced concrete columns can exert active restraint on the core concrete and give full play to the high strength properties of CFRP materials. The stress hysteresis of CFRP can be avoided and better reinforcement effect can be obtained. The displacement-based seismic design method can provide an effective basis for seismic design of structures, prediction of future earthquake damage and evaluation of existing structures, which has been recognized by most countries in the world. The core of this method is to establish the damage assessment model of the structure and to quantitatively calculate the damage index of the structure during the earthquake. At present, the research on displacement-based seismic design is mainly focused on ordinary reinforced concrete structures, and the damage model of prestressed CFRP reinforced concrete structures is rarely studied. In this paper, the experimental study of prestressed CFRP concrete columns with active confinement is carried out, and the mechanism of active confinement is analyzed. The damage model of prestressed CFRP concrete columns under active restraint is established to guide the practical engineering. The main contents are as follows: (1) the seismic behavior of concrete columns strengthened by prestressed CFRP under low cyclic load is studied, and the active restraint of CFRP is analyzed. Damage and failure mechanism of concrete columns. (2) based on the experimental data of seismic behavior of reinforced concrete columns strengthened with CFRP under low-cycle reciprocating loads, The damage model of reinforced concrete columns strengthened with prestressed CFRP is established. (3) referring to the code of our country and the existing research results, Five grades of seismic behavior of reinforced concrete columns strengthened by prestressed CFRP were determined. (4) the low cycle reciprocating load and monotonic loading of prestressed CFRP reinforced concrete columns were subjected to finite element software Abaqus. The finite element simulation is carried out under the finite element method. The load-displacement curve and skeleton curve obtained by finite element simulation are compared with the experimental results to verify the rationality and reliability of the numerical model. The results of finite element analysis are used to verify the damage model established in this paper and the classification standard of seismic performance. The calculated damage index is basically in line with the experimental results, which proves the rationality of the damage model and the classification of the grade.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU375.3

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