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Thin-Walled Steel Stiffened Square Box Columns with Uniform and Graded Thickness under Bidirectional Cyclic Loading
Engineering Structures ( IF 5.5 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.engstruct.2020.110919 Qusay Al-Kaseasbeh , Iraj H.P. Mamaghani
Engineering Structures ( IF 5.5 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.engstruct.2020.110919 Qusay Al-Kaseasbeh , Iraj H.P. Mamaghani
Abstract In this paper, the overall hysteretic behavior of uniform (BB) and proposed graded-thickness (BGB) thin-walled steel square box columns under constant axial force and circular bidirectional cyclic lateral loading is investigated. First of all, the adopted finite element model (FEM) in ABAQUS is verified with the experimental results in the literature and employed for the analysis. Second, the proposed BGB column, with the same cross-section size and volume of material equivalent to the BB column, is evaluated. Then, the strength and ductility deterioration of both BB and BGB columns under circular bidirectional cyclic loading path over the unidirectional path are emphasized. Finally, an intensive parametric study is conducted to investigate the effect of main design parameters including: width-to-thickness ratio parameter (Rf), column slenderness ratio parameter (λ), magnitude of axial load (P/Py), and number of loading cycles (N) on the overall hysteretic behavior of BB and BGB columns under constant axial force and circular bidirectional cyclic lateral loading. Subsequently, design formulae have been derived to predict the ultimate strength and ductility capacities of the BB and BGB columns.
中文翻译:
双向循环荷载作用下厚度均匀分级的薄壁钢加筋方箱柱
摘要 本文研究了等轴力和圆形双向循环横向荷载作用下均匀(BB)和建议分级厚度(BGB)薄壁钢方箱柱的整体滞回性能。首先,在ABAQUS中采用的有限元模型(FEM)与文献中的实验结果进行了验证并用于分析。其次,对建议的 BGB 柱进行评估,该柱具有与 BB 柱相同的横截面尺寸和材料体积。然后,强调了 BB 和 BGB 柱在圆形双向循环加载路径下的强度和延性劣化超过单向路径。最后,进行了深入的参数研究以研究主要设计参数的影响,包括:宽厚比参数 (Rf)、柱长细比参数 (λ)、轴向载荷大小 (P/Py) 和加载循环次数 (N) 对 BB 和 BGB 柱在恒定轴向力和圆形双向循环横向载荷下的整体滞后行为的影响。随后,推导出了用于预测 BB 和 BGB 柱的极限强度和延展能力的设计公式。
更新日期:2020-09-01
中文翻译:
双向循环荷载作用下厚度均匀分级的薄壁钢加筋方箱柱
摘要 本文研究了等轴力和圆形双向循环横向荷载作用下均匀(BB)和建议分级厚度(BGB)薄壁钢方箱柱的整体滞回性能。首先,在ABAQUS中采用的有限元模型(FEM)与文献中的实验结果进行了验证并用于分析。其次,对建议的 BGB 柱进行评估,该柱具有与 BB 柱相同的横截面尺寸和材料体积。然后,强调了 BB 和 BGB 柱在圆形双向循环加载路径下的强度和延性劣化超过单向路径。最后,进行了深入的参数研究以研究主要设计参数的影响,包括:宽厚比参数 (Rf)、柱长细比参数 (λ)、轴向载荷大小 (P/Py) 和加载循环次数 (N) 对 BB 和 BGB 柱在恒定轴向力和圆形双向循环横向载荷下的整体滞后行为的影响。随后,推导出了用于预测 BB 和 BGB 柱的极限强度和延展能力的设计公式。