Three‐dimensional elastic beam frames: Rigid joint conditions in variational and differential formulation

Three‐dimensional elastic beam frames: Rigid joint conditions in variational and differential formulation
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三维弹性梁框架:变分和微分公式中的刚性连接条件

DOI:
10.1111/sapm.12485
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发表时间:
2022
影响因子:
2.7
通讯作者:
Ettehad, Mahmood
Ettehad, Mahmood
中科院分区:
数学3区
文献类型:
--
作者:
Berkolaiko, Gregory;Ettehad, Mahmood

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我们考虑由欧拉-伯努利梁构成的三维弹性框架,并描述了从框架的几何描述中生成节点条件的简单过程。相应的微分算子被证明是自伴的。在平面框架的特殊情况下,该算子分解为两个算子的直接和,一个将面外位移耦合到角(扭转)位移,另一个将面内位移耦合到轴向位移(压缩)。并对两个算例进行了详细分析。我们积极利用对称性的例子中存在的,并分解操作限制到减少子空间对应的对称群的不可约表示。这些“商”运营商示出捕捉特定的振荡模式的帧。
We consider three‐dimensional elastic frames constructed out of Euler–Bernoulli beams and describe a simple process of generating joint conditions out of the geometric description of the frame. The corresponding differential operator is shown to be self‐adjoint. In the special case of planar frames, the operator decomposes into a direct sum of two operators, one coupling out‐of‐plane displacement to angular (torsional) displacement and the other coupling in‐plane displacement with axial displacement (compression). Detailed analysis of two examples is presented. We actively exploit the symmetry present in the examples and decompose the operator by restricting it onto reducing subspaces corresponding to irreducible representations of the symmetry group. These “quotient” operators are shown to capture particular oscillation modes of the frame.
DOI: 10.1093/tse/tdz005
发表时间: 2019-11
影响因子: 2.2
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