Eigenvalue Imperfection Modal Method for Controlling Vertical Geometric Imperfections

LI Chunhua; HE Sheng; XIONG Anping

doi:10.13204/j.gyjzG21083004

Volume 53 Issue 11

Nov. 2023

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LI Chunhua, HE Sheng, XIONG Anping. Eigenvalue Imperfection Modal Method for Controlling Vertical Geometric Imperfections[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(11): 175-179. doi: 10.13204/j.gyjzG21083004

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LI Chunhua, HE Sheng, XIONG Anping. Eigenvalue Imperfection Modal Method for Controlling Vertical Geometric Imperfections[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(11): 175-179. doi: 10.13204/j.gyjzG21083004

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Eigenvalue Imperfection Modal Method for Controlling Vertical Geometric Imperfections

doi: 10.13204/j.gyjzG21083004

LI Chunhua^1,2,3,
HE Sheng^1,2,3,4,
XIONG Anping⁵

1. School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;
2. Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Guangxi University, Nanning 530004, China;
3. Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Nanning 530004, China;
4. Guangxi Bossco Environmental Protection Technology Co., Ltd., Nanning 530007, China;
5. Jiangxi Agricultural University & College of Engineering, Nanchang 330045, China

Received Date: 2021-08-30

Abstract

Abstract

In order to accurately and quickly analyze the stability bearing capacity of single-layer reticulated shells with initial geometric defects, through analyzing the initial geometric imperfection values of eigenvalue imperfection modal method (EIM) and random imperfection modal method (RIMM), and conducting the linear buckling analysis of K8 Kaiweite single-layer reticulated shell structure with 1/4, 1/5, 1/6, 1/7 rise-span ratio, it was found that the vertical geometry imperfection value of the EIM was smaller than that of the RIMM, and it would be more obvious when the rise-span ratio was relatively large. Furthermore, the reason for the low reliability of the EIM when the rise-span was relatively large was analyzed, and the eigenvalue imperfection modal method for controlling vertical geometric imperfections (EIM-CVGI) was proposed. Using the proposed method and the N-order eigenvalue imperfection modal method, the elastoplastic load-displacement whole process analysis of the above four kinds of rise-span ratio reticulated shell structures was carried out. The results showed that the errors of the calculation results of the EIM-CVGI and the N-order eigenvalue defect modal method were within 5% of the engineering allowable. Compared with EIM, the stability performance of the reticulated shell structure could be evaluated more safely.

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References

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