损伤混凝土柱的加固及加固后的性能研究

发布时间：2018-01-03 20:12

本文关键词：损伤混凝土柱的加固及加固后的性能研究　出处：《西安工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：据2015-2020年《加固工程行业前景投资分析报告前瞻》数据显示,我国目前现有大批因超过了设计基准期而有待加固的房屋,有约1/3的住宅安全储备不足,城市的住宅结构也逐渐进入老龄化。另外,由于建设速度快,建筑基数庞大,难免在此过程中会出现各种结构损伤亟待加固的房屋。而在实际工程中,对损伤构件的加固采用有限元模拟比较的研究还比较少见;国内目前在确定加固方案方面仍很大程度上依靠经验,采用有限元软件进行定量优选的研究也并不多见。本文通过一个工程实例,对不同位置的损伤钢筋混凝土柱,即角柱、中柱和边柱,进行两种加固方案(即增大截面法和外包型钢法)的定量优选工作,以期对类似的加固工程提供一定的参考依据。首先,通过对框架边柱、中柱、角柱的损伤状况、破坏特征、受力机理的总结,提出了考虑不同位置柱的不同特点进行分类加固的思想。其次,通过对混凝土柱加固方式优缺点的对比,对增大截面加固法和外包型钢加固法两种工程中应用良好的方法进行优化选择,并利用PKPM加固模块对工程案例中的损伤柱进行了两种方法的加固设计。然后,利用有限元软件ABAQUS分别对工程中的损伤边柱、中柱、角柱建立9个分析模型,通过三种加载方式即位移,力,柱顶水平反复荷载,来全面模拟现实状况下柱可能遭受的荷载工况,并通过对不同加载点的选取来区分角、边、中柱的不同受力特点,得到了柱反力-位移曲线,柱体混凝土等效塑性应变(PEEQ)云图、内部钢筋网的等效应力(MISES)云图、滞回曲线。最后得出如下结论:1)增大截面法和外包型钢法都能大幅度提升钢筋混凝土损伤柱的极限承载能力、抵抗变形能力和耗能能力,但提升幅度有所不同。2)增大截面法对三种位置柱的极限承载力提高能力和抵抗变形能力都较外包型钢柱强,尤其是极限承载力提升能力,比外包型钢法多提升2倍以上。3)对于中柱,通过对三种加载方式下加固柱各性能提高比例的综合比较,增大截面加固柱明显优于外包型钢法,此结论符合工程实际。4)对于边柱和角柱,增大截面法和外包型钢法各有优劣势,若实际工程中仅考虑极限承载能力和变形性能,增大截面法更优;如果考虑抗震性能,外包型钢法更优。
[Abstract]:According to the engineering industry investment analysis report data show that the reinforcement of 2015-2020 forward > <, our existing large number more than for the design reference period and need to be strengthened with insufficient housing, about 1/3 residential safety, city residential structure has gradually entered the aging. In addition, due to the high construction speed, building base the emergence of various structural damage to the reinforcement of housing will inevitably in the process. But in practical engineering, the reinforcement of the damaged member is studied using finite element simulation comparison is still relatively rare; currently in determining the reinforcement scheme is still largely depend on experience, study the quantitative optimization using the finite element software also does not see more. In this paper, through an engineering example, the damage of reinforced concrete columns, different positions in that corner posts, columns and side columns, two reinforcement schemes (i.e. increasing section method and outsourcing steel method) The quantitative optimization work, in order to provide some reference for similar reinforcement projects. Firstly, based on the framework of side column, column, damage, jiaozhu failure characteristics, stress mechanism summary, different characteristics of different locations of columns considering the classification of reinforcement ideas. Secondly, through the comparison of advantages and disadvantages the way of strengthening concrete columns, to optimize the method of increasing section reinforcement and steel reinforcement method outsourcing two engineering application of good, and strengthened the module of the column in the case of damage engineering reinforcement design were carried out two methods using PKPM. Then, using the finite element software ABAQUS is used for engineering damage the side column, column, column 9 analysis model, through three ways of loading the displacement, stress, the horizontal cyclic loading, load to simulate the realistic condition under the column may suffer, and through the different Select the loading point to distinguish angle, edge, in columns of different mechanical characteristics, the column force displacement curve, concrete column equivalent plastic strain (PEEQ) images, the equivalent reinforced the internal stress (MISES) images, hysteretic curve. The conclusions are as follows: 1) increasing interception surface method and steel encased method can greatly enhance the ultimate bearing capacity of reinforced concrete column damage resistance, deformation and energy dissipation capacities, but to enhance the rate of different.2) to improve the ability and the ability to resist deformation than the outer package type steel column bearing capacity limit of three kinds of method of enlarging section position of the column, especially to enhance the capability of ultimate bearing capacity, increase more than 2 times more than the.3 method) for outsourcing steel column, comprehensive comparison of columns each performance of the three kinds of loading mode to increase the proportion of the columns is better than that of steel encased by increasing section, this conclusion is accord with actual engineering.4) for edge Column and corner column, enlarging section method and outsourcing steel method have their own advantages and disadvantages, if the actual project only considering the ultimate bearing capacity and deformation performance, increasing section method better; if we consider the seismic performance of steel encased law is better.

【学位授予单位】：西安工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU37

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