Seismic Behavior and Resilience of an Endplate Rigid Connection for Circular Concrete-Filled Steel Tube Columns
A novel endplate bolted rigid joint is proposed in this study for connecting circular concrete-filled steel tube (CCFT) columns to wide-flange (WF) steel beams. The seismic performance and potential failure mechanisms of the proposed joint were investigated through quasi-static cyclic tests and fini...
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MDPI AG
2025-06-01
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| Online Access: | https://www.mdpi.com/2075-5309/15/12/2035 |
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| author | Yu Gao Peilin Zhu Junping Liu Feng Lou |
| author_facet | Yu Gao Peilin Zhu Junping Liu Feng Lou |
| author_sort | Yu Gao |
| collection | DOAJ |
| description | A novel endplate bolted rigid joint is proposed in this study for connecting circular concrete-filled steel tube (CCFT) columns to wide-flange (WF) steel beams. The seismic performance and potential failure mechanisms of the proposed joint were investigated through quasi-static cyclic tests and finite element (FE) simulations. This study aims to address several engineering challenges commonly observed in existing joint configurations, including an irrational force-resisting mechanism, complicated detailing and installation, on-site construction difficulties, constraints on beam size, and limited repairability. By optimizing the force transfer path, the new joint effectively reduces the number of critical tension welds, thereby enhancing the ductility and reliability. The experimental results indicate that the joint exhibits adequate flexural strength, stiffness, and ductility, with stable moment–rotation hysteresis loops under cyclic loading. Moreover, full restoration of the joint can be achieved by replacing only the steel beam and endplate, facilitating post-earthquake repair. FE analysis reveals that, under the ultimate bending moment at the beam end, multiple through cracks develop in the high-strength grout—which serves as a key load-transferring component—and significant debonding occurs between the grout and the surrounding steel members. However, due to confinement from adjacent components, these internal cracks do not compromise the overall strength and stiffness of the joint. This research provides an efficient and practical connection solution, along with valuable experimental insights, for the application of CCFT columns in moment-resisting frames located in high seismic zones. |
| format | Article |
| id | doaj-art-5d43ff37cdcd4520ba20a539ef0ab0cc |
| institution | Kabale University |
| issn | 2075-5309 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | MDPI AG |
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| series | Buildings |
| spelling | doaj-art-5d43ff37cdcd4520ba20a539ef0ab0cc2025-08-20T03:26:25ZengMDPI AGBuildings2075-53092025-06-011512203510.3390/buildings15122035Seismic Behavior and Resilience of an Endplate Rigid Connection for Circular Concrete-Filled Steel Tube ColumnsYu Gao0Peilin Zhu1Junping Liu2Feng Lou3School of Civil Engineering and Architecture, Taizhou University, Taizhou 318000, ChinaZhejiang Dadongwu Construction Science & Technology Co., Ltd., Huzhou 313071, ChinaCollege of Civil Engineering, Fuzhou University, Fuzhou 350108, ChinaZhejiang Dadongwu Construction Science & Technology Co., Ltd., Huzhou 313071, ChinaA novel endplate bolted rigid joint is proposed in this study for connecting circular concrete-filled steel tube (CCFT) columns to wide-flange (WF) steel beams. The seismic performance and potential failure mechanisms of the proposed joint were investigated through quasi-static cyclic tests and finite element (FE) simulations. This study aims to address several engineering challenges commonly observed in existing joint configurations, including an irrational force-resisting mechanism, complicated detailing and installation, on-site construction difficulties, constraints on beam size, and limited repairability. By optimizing the force transfer path, the new joint effectively reduces the number of critical tension welds, thereby enhancing the ductility and reliability. The experimental results indicate that the joint exhibits adequate flexural strength, stiffness, and ductility, with stable moment–rotation hysteresis loops under cyclic loading. Moreover, full restoration of the joint can be achieved by replacing only the steel beam and endplate, facilitating post-earthquake repair. FE analysis reveals that, under the ultimate bending moment at the beam end, multiple through cracks develop in the high-strength grout—which serves as a key load-transferring component—and significant debonding occurs between the grout and the surrounding steel members. However, due to confinement from adjacent components, these internal cracks do not compromise the overall strength and stiffness of the joint. This research provides an efficient and practical connection solution, along with valuable experimental insights, for the application of CCFT columns in moment-resisting frames located in high seismic zones.https://www.mdpi.com/2075-5309/15/12/2035CCFTseismic behaviorexperimental testmoment connectionseismic repairabilityresilience |
| spellingShingle | Yu Gao Peilin Zhu Junping Liu Feng Lou Seismic Behavior and Resilience of an Endplate Rigid Connection for Circular Concrete-Filled Steel Tube Columns Buildings CCFT seismic behavior experimental test moment connection seismic repairability resilience |
| title | Seismic Behavior and Resilience of an Endplate Rigid Connection for Circular Concrete-Filled Steel Tube Columns |
| title_full | Seismic Behavior and Resilience of an Endplate Rigid Connection for Circular Concrete-Filled Steel Tube Columns |
| title_fullStr | Seismic Behavior and Resilience of an Endplate Rigid Connection for Circular Concrete-Filled Steel Tube Columns |
| title_full_unstemmed | Seismic Behavior and Resilience of an Endplate Rigid Connection for Circular Concrete-Filled Steel Tube Columns |
| title_short | Seismic Behavior and Resilience of an Endplate Rigid Connection for Circular Concrete-Filled Steel Tube Columns |
| title_sort | seismic behavior and resilience of an endplate rigid connection for circular concrete filled steel tube columns |
| topic | CCFT seismic behavior experimental test moment connection seismic repairability resilience |
| url | https://www.mdpi.com/2075-5309/15/12/2035 |
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