基于OMA试验模态参数的砌体结构有限元建模及修正

发布时间：2018-03-26 14:33

本文选题：砌体　切入点：有限元模型　出处：《振动与冲击》2014年14期

【摘要】：依托重庆新红岩隧道工程,选典型2层砌体结构进行隧道施工爆破振动激励的OMA试验,采用等效体积单元法建立能准确反映砌体结构真实动力特性的有限元模型;探讨砌体用不同材料模型所得分析频率与实测频率误差及二者振型相关性;据OMA试验模态参数,基于砌体与混凝土材料参数的结构固有频率灵敏度分析,选择合适的修正参数进行有限元模型修正研究。结果表明,二层砌体结构前4阶固有频率位于9~25 Hz;较用各向同性模型而言,砌体采用各向异性模型时计算所得前4阶频率与实测频率值更接近,振型相关性更好;修正有限元模型中材料密度、弹性模量、剪切模量后频率与实测频率间误差明显减小,结构模型动力特性更符合实际,正交各向异性材料模型修正最准确。
[Abstract]:Based on Chongqing Xinghongyan tunnel project, the typical two-story masonry structure is selected to carry out the OMA test of blasting vibration excitation in tunnel construction, and the finite element model which can accurately reflect the true dynamic characteristics of masonry structure is established by using equivalent volume element method. According to the modal parameters of OMA test, the structural natural frequency sensitivity analysis based on the parameters of masonry and concrete materials is discussed. The results show that the first four natural frequencies of two-story masonry structure are located at 925 Hz, which is better than that of isotropic model. When the anisotropic model is used in masonry, the first four frequency values are closer to the measured frequency value, and the mode correlation is better, and the error between the material density, the elastic modulus, the shear modulus and the measured frequency in the modified finite element model is obviously reduced. The dynamic characteristics of the structure model are more practical, and the orthotropic material model correction is the most accurate.
【作者单位】：北京交通大学土木建筑工程学院;
【基金】：国家自然科学基金项目(51278042);国家自然科学基金项目(L1222021) 铁道部重点课题(2010G016-L-1)
【分类号】：TU364;TU311.3

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