节点刚度和尺寸对三向单层圆柱网壳稳定性的影响

Q1 Arts and Humanities
Hui-jun Li, Y. Taniguchi
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引用次数: 1

摘要

本文的主要目的是研究节点刚度和节点尺寸对单层圆柱网壳承载能力的影响。采用归一化节点弯曲刚度指标κb和提出的归一化节点轴向刚度指标κa、归一化节点剪切刚度指标κs、归一化节点扭转刚度指标κt来评价节点刚度。通过大量的数值计算,得出的主要结论如下:κb对网壳极限荷载有显著影响,且这种影响与网壳的升跨比密切相关。若κb大于30,则可视为刚性关节。κb的对数与网壳极限荷载之间的关系可以用logistic公式表示。节点轴向刚度对网壳整体刚度和承载能力影响较大。当κa大于30时,节点轴向刚度对网壳承载能力的影响不再明显。否则,承载能力将显著降低。κa的对数与网壳极限荷载之间的关系可用剂量-响应公式拟合。节点抗扭刚度和节点抗剪刚度对网壳承载能力也有一定的影响。κs的对数与极限荷载之间的关系可以用渐近公式拟合。节点尺寸对网壳整体刚度和极限荷载的影响是不可忽视的。随着节点尺寸的减小,极限载荷逐渐减小,极限载荷与节点尺寸呈近似线性关系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of joint stiffness and size on stability of three-way single-layer cylindrical reticular shell
The main aim of the present article is to study the effect of joint stiffness and joint size on load-carrying capacity of single-layer cylindrical reticular shell. One normalized joint bending stiffness index κb and three proposed normalized indexes, that is, normalized joint axial stiffness κa, normalized joint shear stiffness κs, and normalized joint torsional stiffness κt, are used to evaluate the stiffness of joint. Through a large number of numerical computations, the main conclusions are summarized as follows: κb has a significant effect on limit load of reticular shell, and this effect has a close relationship to rise-to-span ratio of reticular shell. If κb is larger than 30, the joint can be treated as rigid joint. The relationship between the logarithm of κb and limit load of reticular shell can be expressed by the logistic formulation. Overall rigidity and load-carrying capacity of reticular shell are greatly influenced by joint axial stiffness. If κa is larger than 30, the effect of joint axial stiffness on load-carrying capacity of reticular shell is no longer obvious. Otherwise, the load-carrying capacity will be markedly reduced. The relation between the logarithm of κa and limit load of reticular shell can be fitted by the Dose–response formulation. The load-carrying capacity of reticular shell is also influenced by joint torsional stiffness and joint shear stiffness to some extent. The relation between the logarithm of κs and limit load can be fitted by the Asymptotic formulation. The effect of joint size on overall rigidity and limit load of reticular shell is evident and cannot be neglected. The limit load gradually decreases with the decrease in joint size, and there is an approximate linear relationship between limit load and joint size.
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来源期刊
International Journal of Space Structures
International Journal of Space Structures Arts and Humanities-Conservation
CiteScore
2.00
自引率
0.00%
发文量
21
期刊介绍: The aim of the journal is to provide an international forum for the interchange of information on all aspects of analysis, design and construction of space structures. The scope of the journal encompasses structures such as single-, double- and multi-layer grids, barrel vaults, domes, towers, folded plates, radar dishes, tensegrity structures, stressed skin assemblies, foldable structures, pneumatic systems and cable arrangements. No limitation on the type of material is imposed and the scope includes structures constructed in steel, aluminium, timber, concrete, plastics, paperboard and fabric.
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