發(fā)布時(shí)間：2018-05-07 04:33

  本文選題：石灰?guī)r質(zhì)機(jī)制砂混凝土 + 收縮�。� 參考：《華中科技大學(xué)》2013年碩士論文

【摘要】：隨著天然砂資源的減少，機(jī)制砂的應(yīng)用受到了很大的關(guān)注，但是國內(nèi)對機(jī)制砂混凝土收縮徐變的研究很少，因此對此類混凝土收縮徐變的研究顯得尤為重要。本文主要研究內(nèi)容如下： 比較分析了國內(nèi)外常用收縮徐變預(yù)測模型的考慮因素、適用范圍及預(yù)測精度，為在實(shí)際結(jié)構(gòu)中合理選用預(yù)測模型奠定了基礎(chǔ)。 本文以“石灰?guī)r質(zhì)集料混凝土及北盤江特大橋長期性能研究”課題為背景，進(jìn)行了石灰?guī)r質(zhì)機(jī)制砂混凝土的主要材性及配合比試驗(yàn)，并在自然環(huán)境下，對石灰?guī)r質(zhì)機(jī)制砂混凝土試驗(yàn)梁進(jìn)行了收縮、徐變試驗(yàn)，根據(jù)實(shí)測數(shù)據(jù)，擬合出機(jī)制砂混凝土的收縮應(yīng)變和徐變撓度系數(shù)表達(dá)式；并將其與國內(nèi)外幾種常用的收縮、徐變模式：ACI-209、CEB-FIP、GL2000及B3等進(jìn)行對比分析，結(jié)果表明，配筋率對混凝土收縮應(yīng)變和徐變系數(shù)有一定程度的影響。 本文還進(jìn)行了石灰?guī)r質(zhì)機(jī)制砂和普通砂混凝土標(biāo)準(zhǔn)試件的收縮、徐變試驗(yàn)，探討了不同加載齡期對混凝土徐變系數(shù)的影響，并比較了普通砂和機(jī)制砂混凝土徐變系數(shù)，根據(jù)實(shí)測數(shù)據(jù)，擬合出機(jī)制砂混凝土的收縮應(yīng)變和徐變系數(shù)表達(dá)式，然后對徐變系數(shù)表達(dá)式進(jìn)行修正，得到試驗(yàn)梁的徐變應(yīng)變系數(shù)表達(dá)式，結(jié)果表明，與試驗(yàn)梁徐變撓度系數(shù)相比，徐變應(yīng)變系數(shù)大于徐變撓度系數(shù)。 借助ANSYS和MIDAS/Civil分析軟件模擬了混凝土試驗(yàn)梁的徐變，，并將實(shí)測結(jié)果和模擬結(jié)果進(jìn)行對比分析。
[Abstract]:With the decrease of natural sand resources, great attention has been paid to the application of machine-made sand. However, there are few researches on shrinkage and creep of machine-made sand concrete in China, so it is particularly important to study the shrinkage and creep of such concrete. The main contents of this paper are as follows: The factors, applicable range and prediction accuracy of the commonly used shrinkage and creep prediction models at home and abroad are compared and analyzed, which lays a foundation for the reasonable selection of prediction models in practical structures. In this paper, based on the subject of "study on long-term performance of limestone aggregate concrete and Beipanjiang Bridge", the main material properties and mix ratio tests of limestone mechanism sand concrete are carried out, and in the natural environment, In this paper, shrinkage and creep tests are carried out on limestone machine-made sand concrete test beams. According to the measured data, the expressions of shrinkage strain and creep deflection coefficient of machine-made sand concrete are fitted, and are compared with the shrinkage of several kinds of commonly used concrete at home and abroad. The creep model: ACI-209 CEB-FIPGL2000 and B3 are compared and analyzed. The results show that the reinforcement ratio has a certain effect on the shrinkage strain and creep coefficient of concrete. The shrinkage and creep tests of limestone machined sand and ordinary sand concrete are also carried out in this paper. The effects of different loading ages on creep coefficient of concrete are discussed, and the creep coefficients of ordinary sand and machined sand concrete are compared. According to the measured data, the expressions of shrinkage strain and creep coefficient of machine-made sand concrete are fitted, and then the creep coefficient expression is modified to obtain the creep strain coefficient expression of the test beam. Compared with experimental beam creep deflection coefficient, creep strain coefficient is larger than creep deflection coefficient. The creep of concrete test beam is simulated by ANSYS and MIDAS/Civil software, and the measured and simulated results are compared and analyzed.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU528

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 張運(yùn)濤;;非標(biāo)準(zhǔn)條件下混凝土收縮徐變試驗(yàn)研究[J];安徽建筑工業(yè)學(xué)院學(xué)報(bào)(自然科學(xué)版);2009年05期

2 唐亮,瞿光義;機(jī)制砂在黃花園大橋主橋箱梁C50砼工程中的應(yīng)用[J];重慶交通學(xué)院學(xué)報(bào);2000年02期

3 趙曼,王新敏,高靜;預(yù)應(yīng)力混凝土結(jié)構(gòu)徐變效應(yīng)的有限元分析[J];國防交通工程與技術(shù);2004年01期

4 安文漢;;混合砂混凝土在涪江三橋的研究和應(yīng)用[J];混凝土;2006年08期

5 林南熏;曾成滋;朱錦年;;混凝土徐變的試驗(yàn)研究[J];華南工學(xué)院學(xué)報(bào);1965年04期

6 劉數(shù)華;馮安勇;;混凝土的徐變研究綜述[J];紅水河;2006年03期

7 晁鵬飛;鄭建嵐;;自密實(shí)混凝土徐變性能試驗(yàn)研究[J];建筑結(jié)構(gòu)學(xué)報(bào);2010年02期

8 混凝土收縮與徐變專題協(xié)作組;混凝土收縮與徐變實(shí)用數(shù)學(xué)表達(dá)式的試驗(yàn)研究[J];建筑科學(xué);1987年03期

9 張運(yùn)濤;孟少平;惠卓;;配筋高性能混凝土收縮徐變試驗(yàn)研究[J];建筑科學(xué);2010年03期

10 蘇清洪;加筋混凝土收縮徐變的試驗(yàn)研究[J];橋梁建設(shè);1994年04期

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