距厚比对装配式SCCT剪力墙轴压性能影响研究
庞瑞 , 张健 , 周超锋 , 雷红兵 , 党隆基 , 秦守婉
建筑钢结构进展 ›› 2025, Vol. 27 ›› Issue (10) : 21 -31.
距厚比对装配式SCCT剪力墙轴压性能影响研究
Research on the Influence of Distance-to-Thickness Ratio on the Axial Compressive Performance of Prefabricated SCCT Shear Walls
为研究距厚比对装配式钢-混凝土组合管(SCCT)剪力墙轴压性能影响,本文设计了6个剪力墙试件的轴压性能试验,分析了试件的破坏形态、应变发展、承载能力和位移延性;基于试验并考虑钢板的初始缺陷,建立SCCT剪力墙的精细化有限元模型,并以距厚比为关键参数进行数值分析。结果表明:钢板厚度相同时,随着距厚比的增大,试件钢板屈曲程度加剧,轴压承载力和刚度减小,位移延性略有提高;基于距厚比与钢板厚度、材料强度的正交分析,建议SCCT剪力墙的距厚比取值不超过80;当含钢率相同时,文中所述端部约束形式中圆钢管暗柱墙体的轴压承载能力和变形能力最优。考虑峰值荷载时管内、外混凝土计算强度及钢板有效计算宽度,提出了SCCT剪力墙承载力计算方法,该方法可有效预测SCCT剪力墙轴压承载力。
In order to study the effect of distance-to-thickness ratio on the axial compressive performance of prefabricated steel-concrete composite tube (SCCT) shear walls,axial compressive tests were conducted on six SCCT shear walls. The failure modes,strain development,bearing capacity and displacement ductility were analyzed. Based on the experimental results and considering the initial imperfections of the steel plate,refined numerical models of SCCT shear walls were established by ABAQUS,and numerical analysis was conducted with the distance-to-thickness ratio as key parameter. The results show that as the distance-to-thickness ratio increases,the buckling severity of the steel plate becomes more pronounced,the axial compressive bearing capacity and stiffness decrease,while the ductility improves for the specimens with the same thickness of steel plate. Based on the orthogonal analysis of the distance-to-thickness ratio with steel plate thickness and material strength,it is recommended that the distance-to-thickness ratio of SCCT shear walls should not exceed 80. When the steel ratio is the same,the bearing capacity and displacement ductility of the wall with circular steel pipe concealed column as boundary restrain form are optimal. The proposed formula can effectively predict the axial compressive bearing capacity of SCCT shear walls by considering the calculated strength of concrete inside and outside the steel tube and the effective width of steel plate at peak load.
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国家自然科学基金(52278172)
河南工业大学自科创新基金支持计划(2022ZKCJ05)
河南省粮油仓储建筑与安全重点实验室开放课题(2021KF-02)
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