用高强度方钢管和混凝土护套加固轴向荷载方钢管短柱

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures Pub Date : 2024-11-29 DOI:10.1016/j.engstruct.2024.119395

Wentao Ma, Yuhong Yan, Yiyan Lu, Shan Li, Linzi Wang

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引用次数: 0

摘要

本文研究了高强度方钢管加混凝土护套加固方钢管短柱的轴压性能。试验22根柱：1根参考柱，15根高强度钢管加固柱，6根标准钢管加固柱。试验结果表明，经高强钢管加固后，钢管混凝土柱的承载力、延性和刚度均有显著提高。对于加固柱，采用Q460、Q550和Q690钢管进行加固时，承载力的提高总体上比采用Q235钢管有所上升。然而，Q690钢管加固后的试件在加载过程中出现了角裂现象，部分试件的承载力增幅低于Q550钢管加固后的试件。因此，加固工程建议选用强度等级为Q550及以下的高强钢管。建立了有限元模型，并利用试验结果进行了验证。有限元模型表明，采用高强度钢管增强了原浇混凝土和后浇混凝土极限荷载对应的位移同步，提高了原浇混凝土和后浇混凝土的承载力。在此基础上，提出了高强钢管加混凝土护套加固柱的承载力预测公式。该公式的计算结果与实验和有限元模型的计算结果吻合较好。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Axially loaded square CFST short columns strengthened with high-strength square steel tubes and concrete jackets

This study investigated the axial compressive performance of square concrete-filled steel tube (CFST) short columns strengthened with high-strength square steel tubes and concrete jackets. 22 columns were tested: 1 reference column, 15 columns strengthened with high-strength steel tubes, and 6 columns strengthened with standard steel tubes. The test results showed significant improvements in the load-bearing capacity, ductility, and stiffness of the CFST columns after strengthening by high-strength steel tubes. For strengthened columns, there was a general upward trend in the improvement of load-bearing capacity when Q460, Q550 and Q690 steel tubes were used for strengthening relative to the use of Q235 steel tubes. However, the specimens strengthened with Q690 steel tubes showed corner cracking during loading resulting in a lower increase in load-bearing capacity of some of their specimens than the specimens strengthened with Q550 steel tubes. Therefore, it is recommended to use high-strength steel tubes with strength grades of Q550 or lower for reinforcement projects. A finite element (FE) model was established and verified using the test results. The FE model showed that utilizing high-strength steel tubes enhanced the synchronization of displacements corresponding to the ultimate load of the original and post-cast concretes and improved the bearing capacity of both. Furthermore, a new formula was proposed to predict the load-bearing capacity of columns strengthened with high-strength steel tubes and concrete jackets. The results of this formula showed strong agreement with those of the experiment and FE model.

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来源期刊

Engineering Structures 工程技术-工程：土木

CiteScore

10.20

自引率

14.50%

发文量

1385

审稿时长

67 days

期刊介绍： Engineering Structures provides a forum for a broad blend of scientific and technical papers to reflect the evolving needs of the structural engineering and structural mechanics communities. Particularly welcome are contributions dealing with applications of structural engineering and mechanics principles in all areas of technology. The journal aspires to a broad and integrated coverage of the effects of dynamic loadings and of the modelling techniques whereby the structural response to these loadings may be computed. The scope of Engineering Structures encompasses, but is not restricted to, the following areas: infrastructure engineering; earthquake engineering; structure-fluid-soil interaction; wind engineering; fire engineering; blast engineering; structural reliability/stability; life assessment/integrity; structural health monitoring; multi-hazard engineering; structural dynamics; optimization; expert systems; experimental modelling; performance-based design; multiscale analysis; value engineering. Topics of interest include: tall buildings; innovative structures; environmentally responsive structures; bridges; stadiums; commercial and public buildings; transmission towers; television and telecommunication masts; foldable structures; cooling towers; plates and shells; suspension structures; protective structures; smart structures; nuclear reactors; dams; pressure vessels; pipelines; tunnels. Engineering Structures also publishes review articles, short communications and discussions, book reviews, and a diary on international events related to any aspect of structural engineering.