Simulated field assembly bending experiment and mechanical model of sink-insert joints for prefabricated two-wall-in-one diaphragm walls

IF 5.6 1区 工程技术 Q1 ENGINEERING, CIVIL Engineering Structures Pub Date : 2025-03-15 DOI:10.1016/j.engstruct.2025.120109
Tong Qiu , Xiangsheng Chen , Dong Su , Wei Rao , Aidong Li
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引用次数: 0

Abstract

The prefabricated two-wall-in-one diaphragm wall (PTDW) represents a groundbreaking approach, integrating temporary enclosure with permanent structures into a single prefabricated wall, thereby reducing material usage by 45 % and shortening construction duration by 40 % through mechanical assembly. However, the bending performance of the CT lock-based sink-insert joints, facilitating efficient mechanical assembly, remains an under-explored technological challenge. This study addresses this gap by conducting a novel simulated field assembly bending experiment and developing a parameterized model to evaluate joint mechanics. Furthermore, the application and optimization of this technology in the Shenzhen Metro are presented. Key findings encompass: (1) The CT locks employed in this novel joint exhibit a characteristic of initial gaps, and full-scale experiment has revealed that cracks and separation serve as indicators of the elastic-plastic transition and ultimate bearing capacity. (2) Despite the initial gaps, the CT lock constraints effectively enhance the joint ductility and longitudinal stability of the PTDW. (3) A pivotal load-bearing feature of the sink-insert joint is its manifestation of ductile hinged joint properties under the constraints by the CT locks. (4) The proposed model underscores the benefits of multi-parameter optimization, achieving a notable 22 % reduction in steel consumption while maintaining both the bearing capacity and stiffness of the system. This research addresses critical PTDW joint challenges, advancing low-carbon and high-quality urban construction practices.
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来源期刊
Engineering Structures
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.
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