本文選題：深梁　切入點(diǎn)：受剪承載力　出處：《大連理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：對(duì)于鋼筋混凝土深梁受剪承載力與尺寸效應(yīng),已有諸多學(xué)者進(jìn)行過(guò)大量的試驗(yàn)與理論研究,建立并提出多種深梁受剪承載力分析模型。然而由于深梁受剪機(jī)理與作用因素比較復(fù)雜,目前仍沒(méi)有一種被共同認(rèn)可的分析方法。本文在收集與總結(jié)之前各國(guó)學(xué)者的試驗(yàn)與理論研究成果的基礎(chǔ)上,通過(guò)統(tǒng)計(jì)分析的方法,對(duì)深梁的抗剪計(jì)算與尺寸效應(yīng)問(wèn)題進(jìn)行研究。 本文收集了國(guó)內(nèi)外學(xué)者的634組鋼筋混凝土深梁抗剪試驗(yàn)數(shù)據(jù),采用現(xiàn)行美國(guó)規(guī)范ACI318M-11中拉壓桿模型與我國(guó)規(guī)范GB50010-2010中深受彎構(gòu)件受剪承載力計(jì)算公式進(jìn)行計(jì)算分析對(duì)比。通過(guò)數(shù)據(jù)庫(kù)內(nèi)數(shù)據(jù)的整體分布,分析了深梁受剪承載力尺寸效應(yīng),探討了深梁抗剪尺寸效應(yīng)對(duì)我國(guó)規(guī)范計(jì)算結(jié)果的影響,同時(shí)類比美國(guó)規(guī)范拉壓桿模型計(jì)算結(jié)果。針對(duì)我國(guó)規(guī)范深受彎構(gòu)件受剪承載力計(jì)算公式中各影響因素,分析了我國(guó)規(guī)范在不同影響因素及其各區(qū)間內(nèi)深梁抗剪設(shè)計(jì)的安全性與不足,同時(shí)對(duì)比美國(guó)規(guī)范的計(jì)算結(jié)果�？紤]深梁受剪計(jì)算的諸多影響因素,對(duì)拉壓桿模型中引入了新的混凝土力學(xué)模型,并驗(yàn)證了其適用性。 研究結(jié)果表明,鋼筋混凝土深梁受剪承載力存在顯著的尺寸效應(yīng),該尺寸效應(yīng)會(huì)導(dǎo)致我國(guó)規(guī)范深梁抗剪計(jì)算安全性降低,使設(shè)計(jì)結(jié)果趨于不安全；盡管美國(guó)規(guī)范拉壓桿模型也會(huì)受到深梁抗剪尺寸效應(yīng)的影響,但其設(shè)計(jì)結(jié)果仍然安全。在不同的影響因素區(qū)間內(nèi),我國(guó)規(guī)范的深梁抗剪設(shè)計(jì)安全性存在顯著差異,同美國(guó)規(guī)范相比,我國(guó)規(guī)范適用范圍較窄,計(jì)算安全性較低。本文對(duì)拉壓桿模型改進(jìn)后的深梁受剪承載力計(jì)算結(jié)果良好,充分考慮了受壓斷裂能與鋼筋約束對(duì)混凝土材料性能的影響。
[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.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU375.1

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