One novel block-type brace connector for retrofitting reinforced concrete frames

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures Pub Date : 2024-11-04 DOI:10.1016/j.engstruct.2024.119242

Yifei Zhang , Cong Zeng , Guoshan Xu

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引用次数: 0

Abstract

Buckling-restrained braces are widely utilized for retrofitting existing reinforced concrete frames. However, conventional plate-type brace connectors and joints often suffer damage from the additional forces exerted by buckling-restrained braces during earthquakes. This paper proposes a novel block-type brace connector to address this issue. The seismic performance of this new connector is evaluated through pseudo-dynamic and quasi-static tests. Pseudo-dynamic test results indicate that the reinforced concrete frame retrofitted with the new connectors demonstrates superior seismic performance compared to the frame without retrofitting. During a rare earthquake, the maximum inter-story drift ratios are 1/308 for the frame with new connectors and 1/84 for the frame without retrofitting. Quasi-static test results show that the new connectors shift the potential plastic hinges of the beam away from the gusset plate region by moving the post-installed anchorage position outward. The gusset plate of the conventional connector buckles at an inter-story drift ratio of 1/30, while that of the new connector avoids buckling due to the restraint from the concrete block. Overall, the new connector can mitigate the adverse effects of the additional forces from buckling-restrained braces and improve the seismic performance of the existing reinforced concrete frames.

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用于加固钢筋混凝土框架的新型砌块式支撑连接器

屈曲约束支撑被广泛用于改造现有的钢筋混凝土框架。然而，传统的板式支撑连接件和接头往往会因屈曲约束支撑在地震中施加的附加力而损坏。本文提出了一种新型块状支撑连接器来解决这一问题。通过伪动态和准静态试验对这种新型连接器的抗震性能进行了评估。伪动力试验结果表明，与未加装新型连接器的钢筋混凝土框架相比，加装新型连接器的钢筋混凝土框架具有更优越的抗震性能。在罕见地震中，加装新连接件的框架的最大层间漂移比为 1/308，而未加装连接件的框架的最大层间漂移比为 1/84。准静力测试结果表明，新连接件通过将安装后的锚固位置向外移，将梁的潜在塑性铰链从桁架板区域移开。当层间漂移比为 1/30 时，传统连接件的桁架板会发生屈曲，而新型连接件的桁架板由于受到混凝土块的约束而不会发生屈曲。总之，新型连接件可以减轻屈曲约束支撑所产生的附加力的不利影响，改善现有钢筋混凝土框架的抗震性能。

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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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.