Di Benedetto Sabatino, Latour Massimo, Rizzano Gianvittorio
Department of Civil Engineering, University of Salerno, via Giovanni Paolo II 132, 84084 Fisciano (SA), Italy.
Materials (Basel). 2020 Jul 7;13(13):3030. doi: 10.3390/ma13133030.
Double-tee profiles are the most popular members in Europe and the USA for steel structures. However, more efficient cross-sections, such as circular hollow sections (CHSs), could be adopted, since they can provide higher aesthetic, economic and mechanical benefits, with the only drawback of more complex connections such as in the case of I-beams welded to the external surface of circular hollow profiles. Based on the ring model theory, developed by Togo, a rule to design the flexural resistance of such a connection has been included in the Eurocode 3 part 1.8, while no formulations are provided to predict the corresponding initial stiffness. The present work aims at filling this knowledge gap, adopting an approach based on experimental, numerical and analytical work. A monotonic and a cyclic test have been performed on two beam-to-column sub-assemblies; the experimental outcomes have been exploited to validate a finite element (FE) model developed in Abaqus and used to numerically perform the monotonic loading simulations of 30 joints. Afterwards, starting from the extracted information about stiffness, a regression analysis was carried out to define the coefficient of a design equation analytically derived applying the component method approach. The regression analysis is characterized by a coefficient of variation equal to 0.19.
双T型材是欧美地区钢结构中最常用的构件。然而，也可以采用更高效的截面形式，如圆管截面（CHS），因为它们具有更高的美观性、经济性和力学性能，唯一的缺点是连接更为复杂，例如工字梁焊接到圆管外表面的情况。基于Togo提出的环模型理论，欧洲规范3第1.8部分纳入了此类连接抗弯承载力的设计规则，但未给出预测相应初始刚度的公式。本文旨在通过实验、数值模拟和分析研究填补这一知识空白。对两个梁柱子组件进行了单调和循环试验；利用实验结果验证了在Abaqus中开发的有限元（FE）模型，并用于对30个节点进行单调加载数值模拟。随后，根据提取的刚度信息，采用分量法进行回归分析，确定解析推导的设计方程系数。回归分析的变异系数为0.19。
