Experimental study on seismic performance of infilled frames with improved flexible connection

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures Pub Date : 2025-09-29 DOI:10.1016/j.engstruct.2025.121467

Lihong Xiong , Zhuoxin Wang

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引用次数: 0

Abstract

This study examines the seismic performance of infilled frames with improved flexible connections (IFC), addressing limitations of conventional flexible connections (FC) recommended by Chinese seismic design codes. In-plane (IP) and out-of-plane (OOP) quasi-static tests were conducted on both IFC and FC infilled frames to evaluate and compare their bi-directional seismic behavior. Additional OOP tests on IFC infills were performed to establish performance levels. Finite element simulations were developed to reproduce the IP and OOP responses, and were validated against experimental hysteresis behaviors and damage patterns to explore underlying damage mechanisms further. Results demonstrate that IFC infills utilizing basalt fiber grid (BFG) tie-belts provide superior in-plane decoupling and out-of-plane stability compared to FC infills, especially for autoclaved aerated concrete (AAC) masonry. Under bi-directional loading, FC infills exhibited reduced OOP capacity due to prior in-plane damage, revealing potential vulnerabilities of conventional steel reinforcement connections. The proposed IFC system effectively mitigates these vulnerabilities and achieves enhanced IP capacity objectives and OOP performance, offering a robust solution for improving the seismic resilience of infilled frame structures.

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改进柔性连接框架抗震性能试验研究

本研究考察了具有改进柔性连接（IFC）的填充框架的抗震性能，解决了中国抗震设计规范推荐的传统柔性连接（FC）的局限性。对IFC和FC填充框架进行了面内（IP）和面外（OOP）拟静力试验，以评价和比较它们的双向抗震性能。对IFC填充物进行了额外的OOP测试，以确定性能水平。开发了有限元模拟来再现IP和OOP响应，并根据实验迟滞行为和损伤模式进行验证，以进一步探索潜在的损伤机制。结果表明，与FC填料相比，使用玄武岩纤维网格（BFG）绑带的IFC填料具有更好的面内解耦和面外稳定性，特别是对于蒸压加气混凝土（AAC）砌体。在双向荷载作用下，FC填料由于先前的面内损伤而表现出OOP能力降低，暴露了传统钢筋连接的潜在漏洞。所提出的IFC系统有效地缓解了这些脆弱性，并实现了增强的IP容量目标和OOP性能，为提高填充框架结构的抗震能力提供了一个强大的解决方案。

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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.