地基不均匀沉降对二元件简化模型剪力墙结构影响的反分析研究
发布时间：2018-07-13 17:43
【摘要】：天津市滨海新区属于软土地区，由于软土地基天然承载力低，建筑物在荷载作用下容易发生不均匀沉降。地基的不均匀沉降会引起上部结构内力的重分布，可能导致建筑物产生过大的附加内力和附加变形，进而影响建筑物的正常使用功能甚至使结构破坏。在用ANSYS软件计算分析时，常采用壳单元模拟剪力墙，此模型虽然求解精度高，但计算量大，不适合对大型工程的宏观研究计算。为了减少整体模型的自由度、加快计算速度，本文以二元件模型为基础提出了修改后的二元件模型。通过三种常见剪力墙形式的算例，与壳单元模型计算结果比较，表明修改后的二元件模型具有较好的计算精度，可用于高层剪力墙结构的宏观分析。 本文以天津市滨海新区一实际高层混凝土剪力墙结构为例，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匀沉降对上部结构的影响。将现场实测的位移沉降值作为边界条件拟合建筑物的沉降曲面方程，然后将拟合后的沉降曲面强制施加在结构的有限元模型上，分析上部剪力墙结构产生的附加剪力和附加弯矩的变化规律。通过在有限元模型底部节点施加不同时期的累计沉降值，研究在沉降值、沉降差增大的情况下，上部剪力墙结构附加内力的增幅。比较不均匀沉降引起的上部结构的附加内力占风荷载引起的上部结构的内力的比例，为结构设计或结构加固提供依据。 算例的计算结果表明，不均匀沉降引起剪力墙结构的附加内力随着层数的增加呈现出递减的趋势，即结构底层的附加内力最大，且建筑物外沿剪力墙的附加内力值大于建筑物内部剪力墙的附加内力值。随着沉降值、沉降差的增大，上部剪力墙结构的附加剪力、附加弯矩增加明显，其中以附加弯矩的增加更为显著。
[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.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU398.2;TU433
本文编号：2120215
[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.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU398.2;TU433
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