Влияние податливости внутримодульных узлов на частоту собственных колебаний модульного здания

В. С. Широков
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Abstract

Introduction. The implementation of modular buildings leads to the necessity to develop methods of their calculation, including dynamic loads too. One of the main parameters in the calculation of loads from dynamic effects is the determination of natural frequencies of vibrations of the structure. The subject of research is the natural vibrational frequency of modular buildings. The aim of the research is to determine the effect of the compliance of intramodular joints on the vibrational frequencies of modular buildings. Materials and methods. The paper deals with the determination of the first natural frequency of vibration of a modular building with semi-rigid intramodular joints, and the influence of the compliance of the joints on the frequency. The author of the paper proposed and substantiated an analytical formula for determining the natural vibration frequencies, taking into account the stiffness parameters of modular buildings and the rigidity of intramodular joints. The proposed formula has sufficient accuracy for engineering calculations. At the same time, it allows to analyze the natural vibrational frequencies of modular buildings with different parameters without constructing calculation schemes in computer systems, which significantly speeds up the search for rational design solutions. Results. According to the obtained results, the discrepancy in the frequency values calculated by the finite element method and analytically for a one-story building with different ratios of the rotational stiffness of the joints does not exceed 1.5 %. For a multi-storey modular building, the difference in determining the natural vibration frequencies increases with the number of storeys, but does not exceed 10 % for three storeys. Conclusions. Based on the example of a modular building, it is shown that it is necessary to take into account the joint rigidity to determine the correct value of natural vibrational frequencies. Ignoring of the rotational stiffness of the joints can lead to an error in determining the dynamic effects.
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模内节点可塑性对模块化建筑自身振荡频率的影响
介绍。模块化建筑的实施导致有必要开发其计算方法,包括动荷载。计算动力作用荷载的主要参数之一是确定结构振动的固有频率。本课题的研究对象是模块化建筑的自振频率。研究的目的是确定模内节点的柔度对模块化建筑振动频率的影响。材料和方法。本文讨论了具有半刚性模内节点的模块化建筑的第一固有振动频率的确定,以及节点柔度对频率的影响。本文提出并验证了考虑构件刚度参数和构件间节点刚度的自振频率解析公式。该公式具有足够的工程计算精度。同时,无需在计算机系统中构建计算方案,即可分析不同参数的模块化建筑的自振频率,大大加快了寻找合理设计方案的速度。结果。根据所得结果,在不同节点转动刚度比下,用有限元法计算的频率值与解析法计算的频率值的差异不超过1.5%。对于多层模块化建筑,确定固有振动频率的差异随着层数的增加而增加,但对于三层建筑不超过10%。结论。以某模块化建筑为例,分析了在确定结构固有振动频率时应考虑节点刚度的影响。忽略关节的转动刚度会导致在确定动力效应时出现误差。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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发文量
101
审稿时长
8 weeks
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