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Investigation of side plate connections in an S-CFST column frame under a column-loss scenario
Structures ( IF 4.1 ) Pub Date : 2021-04-05 , DOI: 10.1016/j.istruc.2021.03.039
Wang Zhang , Shiyang Jia , Qingqing Xiong , Zhihua Chen , Hongbo Liu , Tiancheng Su , Qianzi Du

The progressive collapse resistance of four full-scale special-shaped columns composed of concrete-filled steel tubes (S-CFST column)-steel beam assemblies was studied in this paper. The failure modes, deflection profiles, vertical resistance development mechanisms and internal force development at the assumed plastic hinge section under the influence of infilled concrete, various span-to-height ratios of the steel beam and different connection details were compared. The test results showed that the fracture failure of all the specimens first occurred near the full penetration weld of the bottom beam flange or the bottom cover plate at the end of the side plate. Fracture failure of the steel beam web or shear plate occurred through the bolt holes. The beam chord rotation ranged from 0.055 to 0.088. The concrete infilled steel tube improved the ductility of the assembly and resulted in the development of the catenary mechanism, while reducing the span-to-height ratio of the steel beam resulted in the delay of the initiation of the mixed mechanism stage. Additionally, the development of the catenary mechanism was more sufficient for the specimen with the concrete infilled steel tube than the specimen without the concrete infilled steel tube under the same vertical displacement. The results showed that the ACPSP connection can avoid premature fracture of the full penetration weld and improve its progressive collapse resistance. By reducing the span-to-height ratio of the steel beam and using the ACPSP connection, the beam-column assemblies experienced not only the flexural and mixed mechanism stages but also the catenary mechanism stage. The GSPCP connection was proposed to improve the stress concentration in the ACPSP connection. Through further analysis by the verified finite element model, it is evident that the GSPCP connection can further improve the progressive collapse resistance of the S-CFST column-steel beam joint assembly.



中文翻译:

列丢失情况下S-CFST列框架中侧板连接的调查

研究了由钢管混凝土组成的四个全尺寸异形柱(S-CFST柱)-钢梁组合构件的抗连续倒塌性能。比较了在填充混凝土的影响下,假定的塑料铰链部分的破坏模式,挠曲曲线,竖向阻力发展机制和内力发展,钢梁的各种跨高比和不同的连接细节。试验结果表明,所有试样的断裂破坏首先发生在底梁法兰或侧板末端的底盖板的全熔透焊缝附近。钢梁腹板或剪力板的断裂是通过螺栓孔发生的。梁弦旋转范围为0.055至0.088。钢管混凝土提高了组件的延展性,并导致了悬链线机制的发展,同时降低了钢梁的跨高比,导致了混合机制阶段的启动被延迟。另外,在相同的垂直位移下,装有混凝土钢管的试件的悬链机构的发展比没有混凝土钢管的试件的足够。结果表明,ACPSP连接可避免全熔透焊缝过早断裂,并提高其抗渐进抗塌陷性。通过减小钢梁的跨度与高度之比并使用ACPSP连接,梁柱组件不仅经历了弯曲和混合机制阶段,而且经历了悬链机制阶段。提出了GSPCP连接以改善ACPSP连接中的应力集中。通过验证的有限元模型的进一步分析,很明显,GSPCP连接可以进一步提高S-CFST柱-钢梁节点组合件的抗破坏性。

更新日期:2021-04-05
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