钢筋混凝土深梁受剪承载力与尺寸效应

发布时间：2018-03-15 10:16

本文选题：深梁　切入点：受剪承载力　出处：《大连理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：对于钢筋混凝土深梁受剪承载力与尺寸效应,已有诸多学者进行过大量的试验与理论研究,建立并提出多种深梁受剪承载力分析模型。然而由于深梁受剪机理与作用因素比较复杂,目前仍没有一种被共同认可的分析方法。本文在收集与总结之前各国学者的试验与理论研究成果的基础上,通过统计分析的方法,对深梁的抗剪计算与尺寸效应问题进行研究。本文收集了国内外学者的634组钢筋混凝土深梁抗剪试验数据,采用现行美国规范ACI318M-11中拉压杆模型与我国规范GB50010-2010中深受弯构件受剪承载力计算公式进行计算分析对比。通过数据库内数据的整体分布,分析了深梁受剪承载力尺寸效应,探讨了深梁抗剪尺寸效应对我国规范计算结果的影响,同时类比美国规范拉压杆模型计算结果。针对我国规范深受弯构件受剪承载力计算公式中各影响因素,分析了我国规范在不同影响因素及其各区间内深梁抗剪设计的安全性与不足,同时对比美国规范的计算结果。考虑深梁受剪计算的诸多影响因素,对拉压杆模型中引入了新的混凝土力学模型,并验证了其适用性。研究结果表明,钢筋混凝土深梁受剪承载力存在显著的尺寸效应,该尺寸效应会导致我国规范深梁抗剪计算安全性降低,使设计结果趋于不安全；尽管美国规范拉压杆模型也会受到深梁抗剪尺寸效应的影响,但其设计结果仍然安全。在不同的影响因素区间内,我国规范的深梁抗剪设计安全性存在显著差异,同美国规范相比,我国规范适用范围较窄,计算安全性较低。本文对拉压杆模型改进后的深梁受剪承载力计算结果良好,充分考虑了受压断裂能与钢筋约束对混凝土材料性能的影响。
[Abstract]:For the shear capacity and size effect of reinforced concrete deep beams, many scholars have done a lot of experiments and theoretical research. A variety of shear bearing capacity analysis models of deep beams are established and put forward. However, the shear mechanism and action factors of deep beams are complicated. At present, there is still no commonly accepted analytical method. Based on the collection and summarization of the experimental and theoretical research results of scholars from all over the world before this paper, the shearing calculation and size effect of deep beams are studied by statistical analysis method. In this paper, 634 groups of shear test data of reinforced concrete deep beams from domestic and foreign scholars have been collected. The model of tension and compression bar in current American Code ACI318M-11 is compared with the formula for calculating the shear capacity of deep flexural members in GB50010-2010 code of China. The size effect of shear bearing capacity of deep beam is analyzed through the overall distribution of data in the database. The influence of shear size effect of deep beam on the results of code calculation in China is discussed. At the same time, compared with the calculation results of the model of tensile and compression bar of American code, the factors affecting the shear capacity of deep flexural members in our code are discussed. This paper analyzes the safety and deficiency of the shear design of deep beams in different influencing factors of Chinese codes and the design of deep beams in different sections. At the same time, the calculation results of American code are compared. Many factors affecting the shear calculation of deep beams are considered. A new concrete mechanics model is introduced into the tension and compression bar model, and its applicability is verified. The results show that there is a significant dimension effect on the shear capacity of reinforced concrete deep beams, which will lead to a decrease in the safety of the shear calculation of the deep beams in the code in China and make the design results tend to be unsafe. Although the shear size effect of deep beam is also affected by the tensile and compression bar model of American code, the design results are still safe. There are significant differences in the safety of deep beam shear design in China among different influencing factors. Compared with the American code, the applicable range of our code is narrower and the calculation safety is lower. In this paper, the calculated results of the shear capacity of the deep beam after the improvement of the tension and compression bar model are satisfactory. The effect of compressive fracture energy and rebar confinement on the properties of concrete is considered.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU375.1

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