Threshold Value Method and its Application in Dynamic Analysis of Spatial Latticed Structures
Threshold Value Method and its Application in Dynamic Analysis of Spatial Latticed Structures
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DOI：
10.1260/1369-4332.15.12.2215
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发表时间：
2012-12
影响因子：
2.6
通讯作者：
Y. Luo;L. Wang;X.N. Guo
中科院分区：
文献类型：
--
作者：
Y. Luo;L. Wang;X.N. Guo
在传统的振型叠加法中，振型是根据质量参与系数的累积准则进行截断的。这对于多层建筑的抗震分析是有效的，但对空间网架结构的抗震分析却不是很有效。分析了多层建筑与空间网格结构在动力荷载作用下的受力差异，提出了两种新型结构--杆件抗剪结构(MSRS)和杆系轴心抗力结构(MARS)，阐明了质量参与系数的应用。在此基础上，引入了基于振型能量贡献的动态功参与因子(DPF)和静态功参与因子(SPF)，提出了选择主导振型的门限值方法。算例表明，该方法在空间网架结构的线性动力分析中具有较高的效率和较高的精度。
In traditional mode superposition method, vibration modes are truncated based on an accumulation criterion of mass participation factors. This proves to be efficient for the seismic analysis of multi-storey buildings but not so much for spatial latticed structures. This paper analyzes the mechanical differences between multi-storey buildings and spatial latticed structures under dynamic loads and develops two new types of structures, namely Member Shear Resistance Structures (MSRS) and Member Axial Resistance Structures (MARS), with which the application of the mass participation factor is clarified. This paper further introduces Dynamic Work Participation Factor (DPF) and Static Work Participation Factor (SPF) based on vibration mode energy contribution, and proposes Threshold Value Method (TVM) for dominant vibration mode selection. Numerical examples attest that TVM is both efficient and accurate in linear dynamic analysis of spatial latticed structures.