本文關(guān)鍵詞： 隨機(jī)損傷本構(gòu)模型 統(tǒng)計(jì)分析 普通混凝土 纖維混凝土 噴射混凝土力　出處：《西安建筑科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：現(xiàn)有的非確定性本構(gòu)模型主要針對(duì)普通混凝土,對(duì)纖維混凝土、噴射混凝土的研究較少,并且很少考慮到由于混凝土材料組成、施工工藝的不同對(duì)混凝土本構(gòu)模型的影響,缺乏統(tǒng)一的混凝土本構(gòu)模型。本文所建立的隨機(jī)損傷本構(gòu)模型可以通過分布函數(shù)的選擇,以實(shí)現(xiàn)對(duì)不同類型混凝土的區(qū)別研究,進(jìn)而建立了多種混凝土的統(tǒng)一隨機(jī)損傷本構(gòu)模型。本文分別對(duì)設(shè)計(jì)強(qiáng)度等級(jí)為C30的普通混凝土、鋼纖維混凝土、聚丙烯纖維混凝土、噴射混凝土試件進(jìn)行了軸心受壓應(yīng)力-應(yīng)變曲線試驗(yàn)研究。通過試驗(yàn)分析了各組混凝土單軸受壓的破壞過程和應(yīng)力-應(yīng)變曲線的特點(diǎn);利用試驗(yàn)結(jié)果,對(duì)各組混凝土應(yīng)力-應(yīng)變曲線特征參數(shù)(包括峰值應(yīng)力、峰值應(yīng)變、彈性模量、極限應(yīng)變)進(jìn)行了統(tǒng)計(jì)分析,K-S檢驗(yàn)結(jié)果表明,各類混凝土的應(yīng)力-應(yīng)變曲線特征參數(shù)均不拒絕正態(tài)分布、對(duì)數(shù)正態(tài)分布和Weibull分布,為建立隨機(jī)損傷本構(gòu)模型奠定了基礎(chǔ)。根據(jù)平行桿模型原理,在應(yīng)力-應(yīng)變曲線特征參數(shù)統(tǒng)計(jì)分析的基礎(chǔ)上,建立了能夠針對(duì)多種混凝土的統(tǒng)一隨機(jī)損傷本構(gòu)模型,根據(jù)軸心受壓試驗(yàn)結(jié)果確定了隨機(jī)損傷本構(gòu)模型的參數(shù)。并將正態(tài)分布模型、對(duì)數(shù)正態(tài)分布模型和Weibull分布模型的計(jì)算結(jié)果與試驗(yàn)結(jié)果進(jìn)行了對(duì)比分析,研究結(jié)果表明,Weibull分布更適合普通混凝土和噴射混凝土的隨機(jī)損傷本構(gòu)模型;而對(duì)鋼纖維混凝土和聚丙烯纖維混凝土的隨機(jī)損傷本構(gòu)模型則對(duì)數(shù)正態(tài)分布更好。
[Abstract]:The existing non-deterministic constitutive models are mainly for ordinary concrete, fiber reinforced concrete, shotcrete less research, and rarely consider because of the composition of concrete materials. The influence of different construction technology on concrete constitutive model is lack of unified concrete constitutive model. The random damage constitutive model established in this paper can be selected by distribution function. In order to achieve the difference between different types of concrete, the unified stochastic damage constitutive model of various concrete is established. In this paper, the design strength of C30 ordinary concrete, steel fiber concrete respectively. The axial compression stress-strain curves of polypropylene fiber reinforced concrete and shotcrete specimens were studied. The failure process of uniaxial compression and the characteristics of stress-strain curves of each group of concrete under uniaxial compression were analyzed. Based on the test results, the characteristic parameters of stress-strain curves (including peak stress, peak strain, elastic modulus, limit strain) of concrete are analyzed statistically and the results of K-S test show that. The characteristic parameters of stress-strain curves of all kinds of concrete do not refuse normal distribution, logarithmic normal distribution and Weibull distribution, which lays the foundation for the establishment of stochastic damage constitutive model, according to the principle of parallel bar model. Based on the statistical analysis of the characteristic parameters of stress-strain curves, a unified stochastic damage constitutive model for concrete is established. The parameters of the random damage constitutive model are determined according to the results of axial compression test. The results of the logarithmic normal distribution model and the Weibull distribution model are compared with the experimental results. Weibull distribution is more suitable for stochastic damage constitutive model of ordinary concrete and shotcrete. The random damage constitutive model of steel fiber concrete and polypropylene fiber concrete is better than the logarithmic normal distribution.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU528

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本文編號(hào)：1453778