方钢管约束钢筋混凝土短柱抗压和抗剪承载力分析

发布时间：2018-05-10 17:43

本文选题：方钢管约束钢筋混凝土短柱 + ABAQUS　；参考：《青岛理工大学》2013年硕士论文

【摘要】：随着社会的发展,人民生活水平的提高,现代民用建筑正逐渐朝着大跨度和超高层方向发展,在框架结构中钢筋混凝土柱承担的竖向荷载增加,所以必须控制轴压比,才能满足相应建筑规范对于构件延性的要求,这样就会导致框架柱截面增大,因此在高层或超高层建筑的底部容易形成钢筋混凝土短柱。短柱易产生剪切脆性破坏,在建筑结构中为一大安全隐患,需要对钢筋混凝土短柱采取加固措施,提高其延性,优化其抗震性能。本文首先介绍了国内外钢筋混凝土短柱的加固措施的发展与研究现状,研究表明,钢管约束钢筋混凝土短柱的方法效果显著,本文通过经验公式验算方钢管约束钢筋混凝土短柱正截面受压承载力以及在轴压比一定条件下,水平荷载作用下的抗剪承载力,比较在含钢率参数的影响下,其承载力的变化规律。经计算分析,随着含钢率增大,抗剪承载力近似线性关系逐渐增大,其受压承载力逐渐增加,但随着含钢率增大,承载力的增幅逐渐减少,考虑经济因素,确定0.2的含钢率是方钢管钢管约束钢筋混凝土短柱的最优参数。其次,通过ABAQUS建立方钢管约束钢筋混凝土短柱的三维实体模型,进行短柱轴压性能及抗剪性能分析,得到各短柱的轴压力N-位移△曲线以及单向推覆力P-位移△曲线。经模拟计算分析,随着含钢率增大,方钢管约束钢筋混凝土短柱受压承载力逐渐增加,但其增幅逐渐减少；且随着含钢率增大,其抗剪承载力也是随之增大的。但是,含钢率的增加意味着材料费用的增加。因此,工程中需工程人员结合经济及工程需求等综合因素来选择合适的含钢率。
[Abstract]:With the development of society and the improvement of people's living standard, modern civil buildings are gradually developing towards the direction of long span and super high level. The vertical load of reinforced concrete columns in frame structure increases, so the axial compression ratio must be controlled. Only in order to meet the requirements of the corresponding building code for the ductility of the members, this will lead to the increase of the section of the frame column, so it is easy to form reinforced concrete short columns at the bottom of the high-rise or super high-rise building. Short columns are prone to shear brittleness and are a major safety hazard in building structures. It is necessary to take reinforcement measures for reinforced concrete short columns to improve their ductility and to optimize their seismic performance. This paper first introduces the development and research status of reinforcement measures of reinforced concrete short columns at home and abroad. The research shows that the method of steel tube confined reinforced concrete short columns has remarkable effect. In this paper, empirical formulas are used to check the normal section bearing capacity of square steel tube confined reinforced concrete short columns and the shear capacity under horizontal load under certain axial compression ratio. The results are compared under the influence of steel ratio parameters. The change law of bearing capacity. Through calculation and analysis, with the increase of steel content, the approximate linear relationship of shear capacity increases gradually, and the compressive capacity increases gradually, but with the increase of steel content, the increase of bearing capacity decreases gradually, considering economic factors, The steel-containing ratio of 0.2 is the best parameter for the reinforced concrete short column confined by square steel tube. Secondly, the three-dimensional solid model of reinforced concrete short columns confined by square steel tube is established by ABAQUS. The axial compression behavior and shear resistance of short columns are analyzed, and the axial pressure N- displacement curves and unidirectional push-force P- displacement curves of each short column are obtained. Through the simulation analysis, with the increase of the steel content, the compressive capacity of the reinforced concrete short columns confined by square steel tubes increases gradually, but the increase decreases gradually, and the shear capacity increases with the increase of the steel content. However, an increase in steel content means an increase in the cost of materials. Therefore, engineers are required to select the appropriate steel content in combination with economic and engineering demand.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU398.9;TU312

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