|Table of Contents|

Calculation method and modification of axial bearing capacity of corroded circular concrete filled steel tubular stub columns (PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2022年5期
Page:
52-61
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Calculation method and modification of axial bearing capacity of corroded circular concrete filled steel tubular stub columns
Author(s):
ZHANG Wang-xi1; 2;  XIE Yuan-cong2;  ZHANG Yi-tian3;  YI Wei-jian1; 2
(1. Hunan Provincial Key Lab on Diagnosis for Engineering Structures of Hunan University, Changsha 410012, Hunan, China; 2. School of Civil Engineering, Hunan University, Changsha 410012, Hunan, China; 3. Hunan Construction Engineering Group Co., Ltd, Changsha 410000, Hunan, China)
Keywords:
bridge engineering;  structural engineering;  circular concrete filled steel tubular stub column;  modified formula;  corrosion;  bearing capacity;  code
PACS:
U445.57
DOI:
10.19721/j.cnki.1671-8879.2022.05.006
Abstract:
Aiming at the safety problem that concrete filled steel tubular columns suffer from natural corrosion and the decline of bearing capacity during service, a modified bearing capacity calculation formula considering corrosion rate was proposed, by comparing the existing calculation methods and nonlinear fitting. The corroded circular concrete filled steel tubular stub columns were taken as the research object. Firstly, based on the existing experimental data in domestic and foreign literatures(Gao S et al, Hua You-xing et al, Chen Meng-cheng et al)model, the database of axial compression test of corroded circular concrete filled steel tubular stub columns was established. Secondly, several calculation formula of axial compression bearing capacity of codes and calculation models considering the influence of corrosion at home and abroad were compared. Finally, based on the collected experimental data and the calculation model of Hua You-xing, a modified formula of bearing capacity considering the influence of corrosion rate was proposed by nonlinear fitting, and combined with the design habits of China, it was transformed into the calculation formula of axial compression bearing capacity of corroded circular concrete filled steel tubular stub columns expressed in the form of design values. The results show that the calculated values of the codes and models are generally less than the experimental values, which are generally safe. Among all the codes, ANSI/AISC 360-16 is the most conservative, while the calculated values of EN 1994-1-1:2004 are the closest to the experimental values. From the design point of view, the code is conservative, which helps to improve the safety reserve of structural members. Among all the models, Gao et al model has the best prediction results, followed by Chen Meng-cheng et al model and Hua You-xing et al model. The variation coefficients of the ratio between calculated values and experimental values of each calculation method are close, so the discreteness is similar, and the maximum deviation is about 30%. After checking calc

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Last Update: 2022-09-30