填充墙对多层RC框架结构自振周期的影响研究

发布时间：2018-05-27 02:34

本文选题：砌体填充墙 + 多层钢筋混凝土框架结构　；参考：《昆明理工大学》2014年硕士论文

【摘要】：填充墙框架结构因其空间布置比较灵活等优点被广泛应用到办公楼、学校、商场及住宅中,是我国多高层建筑中比较常见的结构形式之一。大量的试验研究和理论分析表明,填充墙对框架结构自振周期的影响是不能忽视的,本文主要从填充墙的砌体材料和空间布置两个主要因素来考虑填充墙对框架结构自振周期的影响,主要工作如下： 1)通过对框架结构自振周期的理论计算方法以及基于结构动力特性测试的各国经验公式的总结,综述了现有经验公式中考虑填充墙砌体材料和空间布置的经验公式极少的现状,又通过对现有常见的填充墙简化模型进行对比分析,指出了各简化模型的使用范围以及本文所使用的有限元模型。 2)采用有限元软件ANSYS基于实际工程建立了一个四层钢筋混凝土框架结构,通过对填充墙不同的砌体材料和空间布置建立有限元模型进行模态分析,并引入参数填充墙影响系数χT,该参数可以与结构动力特性实测数据(即纯框架结构和填充墙框架结构的自振周期)相对应,可以充分考虑填充墙刚度和质量对框架结构的影响,更接近于实际情况。结果表明四种不同砌体材料中弹性模量变化对填充墙框架结构的自振周期影响最大；空间布置中水平方向应尽量均匀布置,竖直方向不均匀布置中填充墙在薄弱层的填充率和薄弱层所在的楼层数对填充墙自振周期的影响很大。又通过单一考虑填充墙质量和刚度的影响进行对比分析,以此得出质量和刚度对自振周期影响的变化曲线。 3)通过对三栋多层钢筋混凝土框架结构(纯框架结构和填充墙框架结构)进行两次结构动力特性测试,和通过考虑填充墙刚度和不考虑填充墙刚度两种方式建立有限元模型,并分别得出周期折减系数和填充墙影响系数,希望以此尝试建立周期折减系数和填充墙影响系数的关系式,填充墙影响系数可以更直观的反映填充墙质量和刚度对框架结构的影响,通过周期折减系数和填充墙影响系数的关系式又可以指导和应用于实际工程。
[Abstract]:The infilled wall frame structure is widely used in office buildings, schools, shopping malls and residential buildings because of its flexible space arrangement. It is one of the most common structural forms in multi-storey buildings in China. A large number of experimental studies and theoretical analysis show that the influence of infilled walls on the natural vibration period of frame structures can not be ignored. In this paper, the influence of infilled wall on the natural vibration period of frame structure is considered from two main factors of masonry material and space arrangement. The main work is as follows: 1) by summing up the theoretical calculation method of the natural vibration period of frame structure and the empirical formulas of various countries based on the testing of the dynamic characteristics of the structure, this paper summarizes the present situation of the few empirical formulas considering the masonry materials and the space arrangement of the infilled wall in the existing empirical formulas. By comparing and analyzing the common simplified model of infill wall, the application scope of each simplified model and the finite element model used in this paper are pointed out. 2) a four-story reinforced concrete frame structure based on practical engineering is established by using finite element software ANSYS. Modal analysis is carried out by establishing finite element model for different masonry materials and spatial arrangement of infilled walls. The influence coefficient 蠂 T of the infilled wall is introduced, which can correspond to the measured data of the dynamic characteristics of the structure (that is, the natural vibration period of the pure frame structure and the infilled wall frame structure), and the influence of the stiffness and mass of the infilled wall on the frame structure can be fully considered. Closer to the actual situation. The results show that the variation of elastic modulus in four kinds of masonry materials has the greatest influence on the natural vibration period of infilled wall frame structure, and the horizontal direction should be arranged uniformly in the space arrangement. The filling ratio of the infilled wall in the weak layer and the number of floors in the weak layer have a great influence on the natural vibration period of the infilled wall in non-uniform vertical arrangement. The influence of mass and stiffness on the natural vibration period is analyzed by comparing and analyzing the influence of the mass and stiffness of the infilled wall, and the variation curve of the effect of mass and stiffness on the natural vibration period is obtained. 3) the dynamic characteristics of three multi-story reinforced concrete frame structures (pure frame structure and infilled wall frame structure) are tested twice, and the finite element model is established by considering the infilled wall stiffness and not considering the infilled wall stiffness. And the periodic reduction coefficient and the infilled wall influence coefficient are obtained respectively, hoping to establish the relationship between the periodic reduction coefficient and the infilled wall influence coefficient. The influence coefficient of infill wall can reflect the influence of infill wall mass and stiffness on frame structure more intuitively, and it can be used in practical engineering through the relationship between periodic reduction coefficient and infill wall influence coefficient.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU375.4

【参考文献】