【摘要】：深受彎構件是指跨高比0l/h(27)5.0的鋼筋混凝土構件,其受剪影響因素眾多且受剪機理復雜,與一般梁有顯著不同。其抗剪計算方法分為兩類:一類稱為“機理模型”,主要通過優(yōu)化“抗剪模型”,將抗剪現(xiàn)象和各影響參數(shù)通過“模型”中的規(guī)律來解釋和體現(xiàn),但計算過程復雜,受尺寸效應影響顯著;另一類稱為“統(tǒng)計概率模型”,即以傳統(tǒng)頻率統(tǒng)計學和試驗研究結果為基礎,合理考慮各影響參數(shù)顯著性和可靠度水準而建立的概率統(tǒng)計模型,其計算過程簡潔,但精度受樣本容量影響,且缺乏明確的理論模型。兩類方法若能更準確的耦合各影響參數(shù)的顯著性作用,則能夠不同程度提高計算精度,對推進深受彎構件抗剪計算與設計具有重要的理論意義和實際價值。為合理量化不同規(guī)范中深受彎構件抗剪影響參數(shù)的顯著性,本文結合691組受剪試驗數(shù)據(jù),對比我國規(guī)范、美國規(guī)范、加拿大規(guī)范、歐洲規(guī)范對深受彎構件抗剪承載力的計算結果;結合統(tǒng)計軟件SPSS,通過相關分析系統(tǒng)地研究了單因素、組合因素對其抗剪能力影響的顯著性,采用Kendall相關系數(shù)、Spearman相關系數(shù)和偏相關系數(shù)進行量化評估,確定顯著性影響參數(shù);利用主成分分析法給出四項綜合指標,分析各指標對實際受剪承載力的影響比重。研究表明:1、各國規(guī)范建議公式計算值與試驗值吻合較好,我國規(guī)范對剪跨比較小的構件計算結果過于保守,基于拉壓桿模型的美國ACI318-08、加拿大CSA A23.3-04、歐洲EC2規(guī)范對于大剪跨比構件計算結果偏于不安全;2、通過SPSS軟件的顯著性分析表明,單因素條件下,混凝土強度等級fc'對受剪承載力影響較為顯著,截面尺寸b和h0,剪跨比a/h0次之,組合因素下,fc'、bh0、ab、a/h0對受剪承載力影響較顯著;3、由主成分分析法得到的四項綜合指標分別為幾何尺寸綜合指標X1、跨高比和縱筋配筋率綜合指標X2、混凝土強度等級和腹筋配筋率綜合指標X3以及剪跨比綜合指標X4,對實際受剪承載力的貢獻比重依次為31%、16%、13%、9%。運用統(tǒng)計軟件SPSS分析出深受彎構件受剪承載力顯著性影響因素,并量化影響因素對受剪承載力的占比,為深受彎構件受剪承載力的計算與設計提供理論參考,為深受彎構件受剪性能的進一步研究提供理論依據(jù),對工程實踐中深受彎構件的應用與推廣具有重要意義和價值。
[Abstract]:Deep-bending member is a reinforced concrete member whose ratio of span to height is 0l/h _ (27) 5.0. There are many factors affecting shear and complex shear mechanism, which is obviously different from that of general beam. The calculation methods of shear resistance are divided into two categories: one is called "mechanism model", mainly by optimizing the "shear model", the shear resistance phenomenon and influence parameters are explained and embodied by the law in the "model", but the calculation process is complicated. It was significantly affected by the size effect. The other is called "statistical probability model", which is based on the traditional frequency statistics and experimental results, and reasonably considers the significance and reliability of each parameter. The calculation process of the model is simple. However, the accuracy is affected by the sample size and there is no clear theoretical model. If the two kinds of methods can more accurately couple the significant effect of the influence parameters, the calculation accuracy can be improved in varying degrees, which has important theoretical significance and practical value for the calculation and design of shear resistance of deep bending members. In order to reasonably quantify the significance of the parameters affected by shear resistance of flexural members in different codes, this paper compares the data of 691 groups of shear tests with the codes of China, the United States and Canada. The results of calculation of shear capacity of deep flexural members in European Code; The significance of the influence of single factor and combined factor on the shear resistance was studied systematically by using the statistical software SPSS,. The significant influence parameters were determined by quantitative evaluation of Kendall correlation coefficient, Spearman correlation coefficient and partial correlation coefficient. Four comprehensive indexes are given by principal component analysis (PCA), and the specific gravity of each index on the actual shear capacity is analyzed. The results show that: 1, the calculated values of the proposed formulas in various countries are in good agreement with the experimental values, and the calculation results of the components with small shear span in our code are too conservative. The American ACI318-08, Canada CSA A23.3-04based on the tension-compression bar model is applied to the calculation. The results of European EC2 Code for large Shear Span ratio members are unsafe. 2. The significance analysis of SPSS software shows that under the condition of single factor, concrete strength grade fc' has significant influence on shear bearing capacity, section size b and h 0, shear span ratio a/h0 second, and combination factor, fc',bh0,ab,. The effect of a/h0 on shear capacity is significant. 3. The four comprehensive indexes obtained by principal component analysis are geometric dimension comprehensive index X1, span height ratio and longitudinal reinforcement ratio X2, concrete strength grade and web reinforcement ratio X3, and shear span ratio X4, respectively. The contribution proportion to the actual shear capacity is 31 and 13. Using the statistical software SPSS to analyze the significant factors affecting the shear capacity of deep flexural members, and to quantify the proportion of the influencing factors to the shear bearing capacity, which provides a theoretical reference for the calculation and design of the shear bearing capacity of deep flexural members. It provides a theoretical basis for the further study of the shear behavior of deep bending members, and has important significance and value for the application and popularization of deep flexural members in engineering practice.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU375

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