Gordziej-Zagórowska Małgorzata, Urbańska-Galewska Elżbieta, Deniziak Patryk
Faculty of Civil and Environmental Engineering, Gdansk University of Technology, 80-233 Gdansk, Poland.
Materials (Basel). 2021 Nov 18;14(22):6986. doi: 10.3390/ma14226986.
The paper presents studies concerning the load-bearing capacity of truss joints with a positive eccentricity resulting from the arrangement of geometric members and the failure mechanisms observed in the joints. Based on the previously conducted experimental study, a numerical model of the tested fragment of the CFS truss with eccentricity in the joint was created and validated. All structural details of the tested truss and the loading method consistent with the experiment were taken into account. The results obtained from a uniaxial tensile tests on a steel samples and results estimated during destructive tests carried out on a full-scale of research model were taken into account in validation of the numerical model. Next, appropriate numerical analyses were carried out and parameters such as the eccentricity size in the joint and the wall thickness of sections ( = 1.0, 1.5 and 4.0 mm) were modified. In the range of the studied wall slenderness from λ > 70 (1.0 mm and 1.5 mm thick), it was confirmed that the resistance of truss joints made from CFS open cross-sections with a positive eccentricity, is greater than the resistance that results from known methods of steel structure dimensioning.
本文介绍了关于桁架节点承载能力的研究，这些节点由于几何构件的布置而产生正偏心，并阐述了在节点中观察到的破坏机制。基于先前进行的试验研究，建立并验证了带节点偏心的冷弯薄壁型钢（CFS）桁架测试片段的数值模型。考虑了测试桁架的所有结构细节以及与试验一致的加载方法。数值模型验证时考虑了对钢样本进行单轴拉伸试验获得的结果以及在全尺寸研究模型上进行破坏试验期间估算的结果。接下来，进行了适当的数值分析，并修改了诸如节点偏心尺寸和截面壁厚（=1.0、1.5和4.0毫米）等参数。在研究的长细比范围λ>70（壁厚1.0毫米和1.5毫米）内，证实了由带正偏心的CFS开口截面制成的桁架节点的抗力大于钢结构尺寸确定已知方法得出的抗力。
