曲线形不锈钢管混凝土构件受弯力学性能研究

郑莲琼; 周子程; 陈敏; 郑永乾

doi:10.13204/j.gyjzG22100701

曲线形不锈钢管混凝土构件受弯力学性能研究

doi: 10.13204/j.gyjzG22100701

1. 福建理工大学土木工程学院, 福州 350118;
2. 福建省土木工程新技术与信息化重点实验室, 福州 350118

基金项目:

国家自然科学基金项目（51308119）；福建省自然科学基金项目（2020J01887）。

详细信息

作者简介:
郑莲琼,女,1982年出生,博士,教授。电子信箱:zhenglianqiong@fjut.edu.cn

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出版历程
- 收稿日期: 2022-10-07
- 网络出版日期: 2023-10-17

Research on Mechanical Properties of Curved Concrete-Filled Stainless Steel Tubular Members Under Bending

1. School of Civil Engineering, Fujian University of Technology, Fuzhou 350118, China;
2. Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering, Fuzhou 350118, China

摘要

摘要: 制作了3个曲线形不锈钢管混凝土构件、1个不锈钢管混凝土直构件和1个曲线形空不锈钢管构件，对构件进行受弯力学性能试验，试验的主要参数是初始弯曲度（u₀=0~120 mm）和是否填充混凝土，试验结果表明：随着构件初始弯曲度的增大，构件的抗弯刚度和抗弯承载力有所提高；曲线形不锈钢管混凝土构件与相应的空心不锈钢管构件相比，管内填充混凝土可显著提高构件的抗弯承载力和抗弯刚度。通过ABAQUS软件建立有限元模型，对曲线形不锈钢管混凝土构件荷载-跨中挠度关系曲线及受弯全过程进行了分析，并与对应的普通碳素钢构件进行了对比。基于弹性刚度模型推导了初始弯曲度对曲线形不锈钢管混凝土受弯构件弹性抗弯刚度影响算式，算式计算结果与试验结果吻合良好。参数分析结果表明：曲线形不锈钢管混凝土构件较相应的普通碳素钢管混凝土构件的承载力提高和抗弯刚度降低分别在10%和15%以内。采用现有规范计算普通钢管混凝土直构件极限抗弯承载力和采用修正后的抗弯刚度算式可较为准确地应用于曲线形不锈钢管混凝土构件抗弯设计。
- 曲线形不锈钢管混凝土 /
- 受弯试验 /
- 有限元分析 /
- 抗弯承载力 /
- 抗弯刚度
Abstract: A total of 5 specimens, including 3 curved concrete-filled stainless steel tubes (CCFSST), one straight concrete filled stainless steel tube (CFSST) and one curved hollow stainless steel tube (CHSST) were tested to study the effects of initial curvature ratio and infilled concrete on the mechanical poperties of CCFSST under bending. The test results showed that with the increase of initial curvature ratio of specimens, the flexural stiffness and flexural bearing capacity of specimens increased compared with the corresponding hollow stainless steel tubular specimen, the concrete filling in the tube could significantly improve the flexural stiffness and flexural bearing capacity of specimens. The finite element software ABAQUS was used to analyze the mechanical characteristics and load versus midspan deflection curves of CCFSST under bending, and compared with plain carbon steel members. The results of the finite element analysis were in good agreement with the test results in general. Based on the elastic stiffness model, the influence formula of initial curvature ratio on the elastic bending stiffness of CCFSST members was deduced, and the calculated results of the formula were in good agreement with the experimental results. Based on parametric analysis, compared with plain carbon steel members, the bearing capacity of CCFSST members was increased by 10% and the bending stiffness was reduced by 15%, respectively. Using the existing codes for straight concrete-filled steel tubes to calculate the ultimate flexural capacity of CCFSST members, and the modified flexural stiffness formula can be more accurately applied to the design of CFSST.
- curved concrete-filled stainless steel tube /
- bending test /
- finite element analysis /
- flexural bearing capacity /
- flexural stiffness

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