外包钢筋混凝土加固在役轴压钢柱的力学性能研究

发布时间：2019-03-08 14:22

【摘要】：钢结构在实际工程所运用的比例近些年来逐步增加,大量的老旧及承载力不足的新建钢结构需要加固,这使得钢结构的加固愈发扮演重要的角色。因此,本文对钢结构加固进行研究,主要研究外包钢筋混凝土加固在役钢柱的承载能力,本文主要有如下方面内容:类比普通钢骨混凝土的承载力特性对在役加固柱力学性能进行分析,分析初始负载、混凝土等级、内部型钢强度以及箍筋约束作用对在役加固柱承载力大小的影响。并根据理论分推导以叠加法为基本方法,在考虑各材料之间的相互影作用后提出在役加固柱的承载力计算方法,并将实验参数用推出的承载力理论计算方法计算,将得出的计算值与实验数据相比较。结果显示,当初始负载与在役加固柱的承载力最大值呈负相关;当混凝土强度增加时,在役加固柱的最大承载能力随之提高;当内部型钢设计强度增加时,在役加固柱的承载能力随之提高;在役加固柱的承载力随着箍筋约束作用提高而提高。建立与实验相匹配的ABAQUS模型,并利用生死单元模拟在役加固柱的全部受力过程,并得到模拟结果,将模拟所得结果和实验数据、计算值相比较并证实了有限元模型可靠之后。利用ABAQUS对更多组不同初始应力水平、不同混凝土强度以及不同内部型钢设计强度的在役加固柱进行有限元模拟分析,在理论推导和实验的基础之上进一步分析了不同影响因素下在役加固柱承载力的大小。对再生混凝土自身特点以及其与强度相关的各参数行分析。根据普通钢筋混凝土在役加固柱的承载能力影响因素类比讨论再生钢筋混凝土在役加固柱的承载能力影响因素,其影响因素分别为初始负载、混凝土强度、内部型钢强度以及箍筋约束作用,并据此提出其承载力计算方法。用有限元软件建立再生钢筋混凝土在役加固柱的模型,改变再生骨料的取代率从而改变混凝土强度,得出不同再生骨料比率下加固柱的承载能力,根据结果可发现当再生骨料比例约50%左右,再生钢筋混凝土与普通钢筋混凝土加固在役钢柱的承载能力相近。
[Abstract]:In recent years, the proportion of steel structures used in practical projects has gradually increased, and a large number of new steel structures, which are old and insufficient in bearing capacity, need to be strengthened, which makes the strengthening of steel structures play an increasingly important role. Therefore, in this paper, the reinforcement of steel structure is studied, mainly on the bearing capacity of reinforced concrete reinforced columns in service. The main contents of this paper are as follows: analogizing the bearing capacity of ordinary steel reinforced concrete (SFRC), analyzing the mechanical properties of reinforced columns in service, analyzing the initial load, the grade of concrete, The influence of internal steel strength and stirrups on the bearing capacity of reinforced columns in service. According to the theory, based on the superposition method, the calculation method of the bearing capacity of the reinforced columns in service is put forward after considering the interaction between the materials, and the experimental parameters are calculated by the theoretical calculation method of the derived bearing capacity. The calculated values are compared with the experimental data. The results show that there is a negative correlation between the initial load and the maximum bearing capacity of the reinforced columns in service, and when the strength of the concrete increases, the maximum bearing capacity of the columns in service increases with the increase of the initial load and the maximum bearing capacity of the columns in service. When the design strength of internal section steel increases, the bearing capacity of in-service reinforced columns increases, and the bearing capacity of in-service strengthened columns increases with the increase of stirrups. The ABAQUS model matched with the experiment is established, and the whole loading process of the column in service is simulated by the birth and death element. The simulation results are compared with the experimental data and the calculated values are compared with the experimental data, and the reliability of the finite element model is verified after the simulation results are compared with the experimental data. The finite element simulation analysis of more groups of reinforced columns in service with different initial stress levels, different concrete strength and different internal steel design strength is carried out by using ABAQUS. On the basis of theoretical deduction and experiment, the bearing capacity of in-service reinforced columns is further analyzed under different influence factors. The characteristics of recycled concrete and its parameters related to strength are analyzed. Based on the analogy of the factors affecting the bearing capacity of reinforced concrete columns in service, this paper discusses the influencing factors of the bearing capacity of reclaimed reinforced concrete columns in service. The influencing factors are the initial load and the strength of concrete, respectively. The strength of internal section steel and the restraint action of stirrups are analyzed, and the calculation method of bearing capacity is put forward. The finite element software is used to set up the model of reinforced concrete column in service, change the substitution rate of recycled aggregate and change the strength of concrete, and get the bearing capacity of reinforced column under different ratio of recycled aggregate. According to the results, it can be found that when the proportion of recycled aggregate is about 50%, the bearing capacity of recycled reinforced concrete is similar to that of ordinary reinforced concrete reinforced steel columns in service.
【学位授予单位】：沈阳大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU391

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