【摘要】：地基和基礎(chǔ)是建筑物的根基,又屬于地下隱蔽工程,它的勘察、設(shè)計和施工質(zhì)量直接關(guān)系著建筑物的安危。鋼筋混凝土柱下獨立基礎(chǔ)是上業(yè)、民用建筑中廣泛采用的一種基礎(chǔ)形式,現(xiàn)行的《建筑地基基礎(chǔ)設(shè)計規(guī)范》(GB50007-2011)中對柱下獨立基礎(chǔ)受彎承載能力的計算方法存在一些實際問題。本文首先介紹了我國規(guī)范中關(guān)于柱下獨立基礎(chǔ)受彎承載力計算方法的發(fā)展過程,通過受力時的平衡分析,利用數(shù)學(xué)方法,對我國現(xiàn)行的及曾使用的《地基基礎(chǔ)設(shè)計規(guī)范》中獨立基礎(chǔ)底板受彎計算公式進行了推導(dǎo)。在此基礎(chǔ)上,將地基假設(shè)為無限多個小樁,利用現(xiàn)行的《建筑樁基技術(shù)規(guī)范》(JGJ94-2008)中柱下獨立承臺受彎的計算公式進行了計算對比,分析了它們之間的差異。然后,對現(xiàn)有規(guī)范公式的計算方法本身進行討論。指出現(xiàn)有計算公式按梯形破壞機構(gòu)模式計算的不合適之處；在此基礎(chǔ)上.對柱下獨立基礎(chǔ)進行塑性鉸線分析,應(yīng)用塑性鉸線法推導(dǎo)出柱下獨立基礎(chǔ)的極限承載彎矩；根據(jù)以上分析按基礎(chǔ)受彎井形破壞機構(gòu)模式的計算方法建立柱下獨立基礎(chǔ)底板受彎承載能力新的計算公式。最后,對本文所推導(dǎo)出的新的計算公式進行安全性評價。結(jié)合算例及本文作者的實際工程設(shè)計實例,對比兩種計算公式的計算結(jié)果,根據(jù)實際配筋研究按照現(xiàn)行規(guī)范公式計算配筋結(jié)果是否安全。并嘗試推導(dǎo)出二者公式的“臨界點”,得出在哪些邊界條件下,按規(guī)范公式計算并設(shè)計配筋的獨立基礎(chǔ)將可能偏于不安全。
[Abstract]:The foundation and foundation are the foundation of the building and belong to the underground hidden engineering. Its investigation, design and construction quality are directly related to the safety of the building. The independent foundation under reinforced concrete column is a kind of foundation form widely used in civil buildings. There are some practical problems in the current Code for Design of Building Foundation (GB50007-2011) for calculating the bending bearing capacity of independent foundation under column. This paper first introduces the development process of the calculation method of the bending capacity of the independent foundation under the column in the code of our country, and deduces the calculation formula of the bending capacity of the bottom plate of the independent foundation in the Code for the Design of the Foundation in our country by means of the balance analysis and the mathematical method. On this basis, the foundation is assumed to be an infinite number of small piles, and the calculation and comparison of the bending of the independent cap under the middle column in the current Technical Code for Building pile Foundation (JGJ94-2008) are carried out, and the differences between them are analyzed. Then, the calculation method of the existing specification formula itself is discussed. It is pointed out that the existing formulas are not suitable for calculation according to the mode of ladder failure mechanism, on the basis of which, it is pointed out that the existing formulas are not suitable for the calculation of ladder failure mechanism. The plastic hinge line analysis of the independent foundation under the column is carried out, and the ultimate bearing moment of the independent foundation under the column is derived by using the plastic hinge method. According to the above analysis, a new formula for calculating the bending bearing capacity of the bottom plate of the independent foundation under the column is established according to the calculation method of the bending well failure mechanism mode of the foundation. Finally, the security of the new formula derived in this paper is evaluated. Combined with an example and an actual engineering design example of this paper, the calculation results of the two formulas are compared, and the safety of calculating the reinforcement results according to the current code formula is studied according to the actual reinforcement formula. The "critical point" of the two formulas is deduced, and it is concluded that under which boundary conditions, the independent foundation of reinforcement calculated and designed according to the standard formula may be unsafe.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU470

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