本文選題：鋼管活性粉末混凝土 + 有限元　； 參考：《北京交通大學(xué)》2014年碩士論文

【摘要】：活性粉末混凝土是一種具有高強、高性能、高耐久性等眾多優(yōu)勢的新型建筑材料；活性粉末混凝土與鋼管結(jié)合,形成鋼管活性粉末混凝土,作為受壓構(gòu)件時,通過發(fā)揮鋼管的套箍作用,可以克服活性粉末混凝土本身脆性大的缺陷,極大提高其承載能力,具有十分廣闊的應(yīng)用前景。 本文綜合前人關(guān)于鋼管活性粉末混凝土柱受壓性能的試驗結(jié)果,結(jié)合已有的鋼管普通混凝土及鋼管高強混凝土理論成果,借助大型有限元分析軟件ABAQUS,對鋼管活性粉末混凝土短柱和長柱在軸心及偏心荷載作用下的極限承載力進(jìn)行研究,主要研究成果如下： (1)類比普通鋼管混凝土的短柱極限承載力推導(dǎo)方法,推導(dǎo)了鋼管活性粉末混凝土短柱的軸心受壓極限承載力公式；根據(jù)材料力學(xué)關(guān)于長柱穩(wěn)定承載力的計算方法,結(jié)合Euler公式,給出了鋼管活性粉末混凝土長柱穩(wěn)定系數(shù)和極限承載力的計算公式；分析了鋼管活性粉末混凝土柱在偏心荷載作用下的受力特性。 (2)建立了鋼管活性粉末混凝土短柱軸心受壓模型并計算,與前人試驗結(jié)果對比,論證了模型計算結(jié)果的可靠性；利用模型計算軸壓短柱的極限承載力,分析加載過程中短柱的受力性能,根據(jù)模型計算結(jié)果擬合其計算公式,與現(xiàn)有文獻(xiàn)中的極限承載力數(shù)據(jù)對比,說明公式的合理性。 (3)建立了鋼管活性粉末混凝土長柱軸心受壓模型并計算,與前人試驗結(jié)果對比,論證了模型計算結(jié)果的可靠性；利用模型計算軸壓長柱的極限承載力,分析長柱在軸心荷載作用下的受力性能,根據(jù)模型計算結(jié)果分析長細(xì)比對長柱極限承載力的影響,并擬合了穩(wěn)定系數(shù)的計算公式。 (4)在軸壓模型的基礎(chǔ)上,建立了鋼管活性粉末混凝土短柱和長柱偏心受壓模型并計算,根據(jù)計算結(jié)果觀察偏心荷載作用下短柱和長柱的受力性能及荷載-應(yīng)變曲線、彎矩-曲率曲線的特點,分析了偏心距對短柱和長柱極限承載力的影響,結(jié)果證明,偏心距在一定范圍內(nèi)增加時,對極限承載力影響不大,套箍指標(biāo)的增大有助于提高極限承載力及改善構(gòu)件延性。 (5)本文模型的計算結(jié)果與已有試驗結(jié)果較為吻合,給出的極限承載力公式能較好地貼合實際；在今后的研究中,更多的試驗數(shù)據(jù)可與本文結(jié)論相互修正。
[Abstract]:Reactive powder concrete (RPC) is a new building material with many advantages, such as high strength, high performance and high durability. It is possible to overcome the defect of brittleness of reactive powder concrete (RPC) by exerting the clamping effect of steel pipe and to improve its bearing capacity greatly. It has a very broad application prospect. In this paper, the experimental results on the compressive behavior of reactive powder concrete filled steel tubular columns are summarized, combined with the existing theoretical results of ordinary concrete filled steel tube and high strength concrete filled steel tube. With the help of the finite element analysis software Abaqus, the ultimate bearing capacity of short and long columns of reactive powder concrete filled steel tube under axial and eccentric loads is studied. The main results are as follows: In this paper, the formula of axial compression ultimate bearing capacity of short column of reactive powder concrete filled steel tube is deduced, according to the calculation method of material mechanics about the stable bearing capacity of long column, the formula of Euler is combined with the method of calculating the ultimate bearing capacity of short column. The formulas for calculating the stability coefficient and ultimate bearing capacity of the long column of reactive powder concrete filled steel tube are given, and the stress characteristics of the column under eccentric load are analyzed. (2) the axial compression model of the short column of reactive powder concrete filled steel tube is established and calculated. The reliability of the model is proved by comparing with the results of previous tests, and the ultimate bearing capacity of the short column under axial compression is calculated by using the model. The mechanical behavior of the short column during loading is analyzed and the formula is fitted according to the results of the model calculation. Compared with the data of the ultimate bearing capacity in the existing literature, the rationality of the formula is demonstrated. The axial compression model of long column with reactive powder concrete filled steel tube is established and calculated. The reliability of the model is proved by comparing with the experimental results of predecessors, and the ultimate bearing capacity of long column under axial compression is calculated by using the model. The bearing behavior of long columns under axial load is analyzed, and the influence of aspect ratio on ultimate bearing capacity of long columns is analyzed according to the results of model calculation, and the formula of stability coefficient is fitted. On the basis of axial compression model, the eccentric compression models of short and long columns of reactive powder concrete filled steel tube are established and calculated. According to the calculated results, the mechanical behavior and load-strain curves of short columns and long columns under eccentric load are observed. The influence of eccentricity on the ultimate bearing capacity of short columns and long columns is analyzed. The results show that when the eccentricity increases within a certain range, the influence of eccentricity on ultimate bearing capacity is not significant. The increase of hoop index is helpful to improve ultimate bearing capacity and ductility. 5) the calculated results of the model are in good agreement with the existing experimental results, and the formula of ultimate bearing capacity can fit well with the practice, and in the future, more experimental data can be revised with the conclusion of this paper.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU398.9

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