|Table of Contents|

Study on the in-plane stability of high-strength steel members under combined axial compression and bending based on member direct analysis method(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年04期
Page:
107-116
Research Field:
建筑结构
Publishing date:

Info

Title:
Study on the in-plane stability of high-strength steel members under combined axial compression and bending based on member direct analysis method
Author(s):
LI Zhonghan1;  LIU Zhanke2; 3
(1. Gansu Communications Sci-Tech Construction Co., Ltd., Lanzhou 730030, Gansu, China; 2. Key Laboratory of Mechanics on Disaster and Environment in Western China, The Ministry of Education of China, Lanzhou University, Lanzhou 730000, Gansu, China; 3. College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, Gansu, China)
Keywords:
member direct analysis method;  high-strength members under combined axial compression and bending;  in-plane stability;  equivalent moment factor;  Cmx factor
PACS:
TU391
DOI:
10.19815/j.jace.2022.11060
Abstract:
Based on the member direct analysis method, the general analysis process of in-plane stability of simply supported initial bending members under combined axial compression and bending was established, and the general expressions of deflection and second-order moment were obtained. Taking the initial bending members under combined axial compression and full-span uniform load or mid-span concentrated load as the research object, the position of the maximum second-order moment was determined by the combination of expressions and figures, and the corresponding expressions of the maximum second-order moment and Cmx factor were obtained. Based on the first yield criterion, the axial force-moment correlation equation was proposed. Cmx factor was compared with the equivalent moment factor in the Standard for Design of Steel Structure(GB 50017—2017), and the correctness of the analysis results was verified by numerical examples. The results show that for the in-plane stability of simply supported initial bending members under combined axial compression and bending, it is not necessary to use the concept of equivalent moment and the equivalent moment factor to determine the internal force, and the equivalent moment factor in GB 50017—2017 does not achieve the equivalent effect. When the in-plane stability of simply supported initial bending members under combined axial compression and bending is designed according to the Standard for Design of High Strength Steel Structure(JGJ/T 483—2020), it is recommended to use Cmx factor instead of the equivalent moment factor in GB 50017—2017.

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Last Update: 2023-07-01