【摘要】：天津市濱海新區(qū)屬于軟土地區(qū)，由于軟土地基天然承載力低，建筑物在荷載作用下容易發(fā)生不均勻沉降。地基的不均勻沉降會(huì)引起上部結(jié)構(gòu)內(nèi)力的重分布，可能導(dǎo)致建筑物產(chǎn)生過大的附加內(nèi)力和附加變形，進(jìn)而影響建筑物的正常使用功能甚至使結(jié)構(gòu)破壞。在用ANSYS軟件計(jì)算分析時(shí)，常采用殼單元模擬剪力墻，此模型雖然求解精度高，但計(jì)算量大，不適合對(duì)大型工程的宏觀研究計(jì)算。為了減少整體模型的自由度、加快計(jì)算速度，本文以二元件模型為基礎(chǔ)提出了修改后的二元件模型。通過三種常見剪力墻形式的算例，與殼單元模型計(jì)算結(jié)果比較，表明修改后的二元件模型具有較好的計(jì)算精度，可用于高層剪力墻結(jié)構(gòu)的宏觀分析。 本文以天津市濱海新區(qū)一實(shí)際高層混凝土剪力墻結(jié)構(gòu)為例，采用修改后的二元件模型，，建立ANSYS有限元模型，采用反分析的方法研究地基不均勻沉降對(duì)上部結(jié)構(gòu)的影響。將現(xiàn)場實(shí)測的位移沉降值作為邊界條件擬合建筑物的沉降曲面方程，然后將擬合后的沉降曲面強(qiáng)制施加在結(jié)構(gòu)的有限元模型上，分析上部剪力墻結(jié)構(gòu)產(chǎn)生的附加剪力和附加彎矩的變化規(guī)律。通過在有限元模型底部節(jié)點(diǎn)施加不同時(shí)期的累計(jì)沉降值，研究在沉降值、沉降差增大的情況下，上部剪力墻結(jié)構(gòu)附加內(nèi)力的增幅。比較不均勻沉降引起的上部結(jié)構(gòu)的附加內(nèi)力占風(fēng)荷載引起的上部結(jié)構(gòu)的內(nèi)力的比例，為結(jié)構(gòu)設(shè)計(jì)或結(jié)構(gòu)加固提供依據(jù)。 算例的計(jì)算結(jié)果表明，不均勻沉降引起剪力墻結(jié)構(gòu)的附加內(nèi)力隨著層數(shù)的增加呈現(xiàn)出遞減的趨勢，即結(jié)構(gòu)底層的附加內(nèi)力最大，且建筑物外沿剪力墻的附加內(nèi)力值大于建筑物內(nèi)部剪力墻的附加內(nèi)力值。隨著沉降值、沉降差的增大，上部剪力墻結(jié)構(gòu)的附加剪力、附加彎矩增加明顯，其中以附加彎矩的增加更為顯著。
[Abstract]:Tianjin Binhai New area belongs to soft soil area. Due to the low natural bearing capacity of soft soil foundation, buildings are prone to uneven settlement under load. The uneven settlement of the foundation will lead to the redistribution of the internal force of the superstructure, which may lead to excessive additional internal force and additional deformation of the building, and then affect the normal function of the building and even destroy the structure. The shell element is often used to simulate the shear wall in ANSYS software. Although the precision of the model is high, it is not suitable for the macroscopic research of large engineering. In order to reduce the degree of freedom of the whole model and speed up the calculation, this paper presents a modified two-element model based on the two-element model. By comparing the results of three common shear wall models with the shell element model, it is shown that the modified two-element model has good calculation accuracy and can be used for macroscopic analysis of high-rise shear wall structures. Taking a practical high-rise concrete shear wall structure in Binhai New area of Tianjin as an example, the finite element model of ANSYS is established by adopting the modified two-element model, and the influence of uneven settlement of foundation on the superstructure is studied by the method of back analysis. The field measured displacement settlement value is used as boundary condition to fit the settlement surface equation of the building, and then the fitted settlement surface is forced to be applied to the finite element model of the structure. The variation law of additional shear force and additional bending moment produced by upper shear wall structure is analyzed. By applying the accumulative settlement value in different periods at the bottom of the finite element model, the increase of the additional internal force in the upper shear wall structure is studied when the settlement value and the settlement difference increase. The ratio of the additional internal force of the superstructure caused by uneven settlement to the internal force of the superstructure caused by the wind load is compared, which provides the basis for the structural design or structural strengthening. The calculation results show that the additional internal force of shear wall structure due to uneven settlement decreases with the increase of the number of layers, that is, the maximum additional internal force is found in the bottom layer of the structure. The additional internal force of the external shear wall is larger than that of the inside shear wall. With the increase of settlement value and settlement difference, the additional shear force and additional moment of upper shear wall structure increase obviously, especially the additional moment.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU398.2;TU433

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