X形方圆钢管相贯节点超低周疲劳断裂试验研究
引用文献：
李雪婷 黄学伟 赵军 赵威 葛建舟 王旭锋. X形方圆钢管相贯节点超低周疲劳断裂试验研究[J]. 建筑结构，2022，48（04）：86-92.
LI Xueting HUANG Xuewei ZHAO Jun ZHAO Wei GE Jianzhou WANG Xufeng. Experimental study on ultra-low cycle fatigue fracture of X-shaped steel joints with circular hollow section braces to square hollow section chord[J]. Building Structure，2022,48（04）：86-92.
摘要：为研究焊缝类型和内加肋板对钢管相贯节点超低周疲劳性能的影响，开展了3个X形方圆钢管相贯节点的超低周疲劳试验，研究了节点的破坏形态，分析了节点处的应变分布规律，得到了节点的疲劳寿命。试验结果表明：3个X形方圆钢管相贯节点的裂纹均起始于节点的鞍点位置，角焊缝和熔透焊缝X形方圆钢管焊接相贯节点均呈现出冲切破坏特征，并且焊缝形式未对节点的变形能力和疲劳寿命产生明显的影响。主管采用的内加劲肋的节点呈现出拉伸断裂破坏特征，其变形能力较差，并且断裂破坏前没有明显的表面裂纹，断裂突然发生，因此在较高烈度的地震设防区，从节点的抗断裂性能和变形能力考虑，在工程设计中，不建议采用主管内加劲肋来提高节点的承载能力。
关键词：钢管结构，X形方圆钢管相贯节点，超低周疲劳性能，焊缝
基金：国家自然科学基金项目(51608487)；河南省科技攻关项目(192102310221)；河南省高等学校重点科研项目计划(17A130002)；郑州大学大学生创新创业训练计划项目(2019cxcy338)。
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[2] 陈以一，王伟，周锋.钢管结构——新需求驱动的形式拓展和性能提升[J].建筑结构学报，2019,40(3):1-20.
[3] QIAN X D,DODDS R,CHOO Y.Elasto-plastic crack driving force for tubular K-joints with mismatched welds[J].Engineering Structures,2005(27):1419-1434.
[4] GU B,QIAN X D,AHMED A.A toughness based deformation limit for X-and K-joints under brace axial tension[J].Frontiers in Structural and Civil Engineering,2016,10(3):345-362.
[5] 黄学伟，张旭，苗同臣.建筑结构钢超低周疲劳断裂破坏的损伤预测模型[J].工程力学，2017,34(6):101-108.
[6] 王伟，廖芳芳，陈以一.基于微观机制的钢结构节点延性断裂预测与裂后路径分析[J].工程力学，2014,31(3):101-108,115.
[7] LIAO F F,WANG W,CHEN Y Y.Ductile fracture prediction for welded steel connections under monotonic loading based on micromechanical fracture criteria[J].Engineering Structures,2015(94):16-28.
[8] MA X X,WANG W,CHEN Y Y,et al.Simulation of ductile fracture in welded tubular connections using a simplified damage plasticity model considering the effect of stress triaxiality and lode angle[J].Journal of Constructional Steel Research,2015(114):217-236.
[9] KANVINDE A M,DEIERLEIN G G.Cyclic void growth model to assess ductile fracture initiation in structural steels due to ultra low cycle fatigue[J].Journal of Engineering Mechanics,2007,133(6):701-712.
[10] TONG L W,HUANG X W,ZHOU F,et al.Experimental and numerical investigations on extremely-low-cycle fatigue fracture behavior of steel welded joints[J].Journal of Constructional Steel Research,2016(119):98-112.
[11] HUANG X W,ZHAO J.A cumulative damage model for extremely low cycle fatigue cracking in steel structure[J].Structural Engineering and Mechanics,2017,62(2):225-236.
[12] ZHOU H,WANG Y Q,SHI Y J,et al.Extremely low cycle fatigue prediction of steel beam-to-column connection by using a micro-mechanics based fracture model[J].International Journal of Fatigue,2013,48 (2):90-100.
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[14] LIU J T,YAN S,ZHAO X Z.Simulation of fracture of a tubular X-joint using a shear-modified Gurson-Tvergaard-Needleman model[J].Thin-Walled Structures,2018(132):120-135.
[15] QIAN X D,ZHANG Y,CHOO Y.A load deformation formulation with fracture representation based on the J-R curve for tubular joints[J].Engineering Failure Analysis,2013(33):347-366.
[16] 建筑钢结构焊接技术规程：JGJ 81—2002[S].北京：中国建筑工业出版社，2003.
[17] 钢结构设计标准：GB 50017—2017[S].北京：中国建筑工业出版社，2018.
Experimental study on ultra-low cycle fatigue fracture of X-shaped steel joints with circular hollow section braces to square hollow section chord
Abstract: In order to study the effect of weld types and internal stiffening rib on ultra-low cycle fatigue performance of steel tubular joints, three X-shaped steel joints with circular hollow section(CHS) braces to square hollow section(SHS) chord were tested under ultra-low cyclic loading and the failure modes of the joints were investigated. Meanwhile, strain distribution at the joints and fatigue life of the joints were obtained in the tests. The test results show that crack starts at the saddle of joints for all three steel tubular joints, and punching failure is observed for the X-shaped steel joint with CHS braces to SHS chord with fillet weld and X-shaped steel joint with CHS braces to SHS chord with penetration weld; besides, the type of weld has no obvious influence on the deformation capacity and fatigue life of the joint. It shows tensile fracture failure characteristic for the steel tubular joint with internal stiffening rib in the chord, and the joint has very limited deformation capacity. Furthermore, there are no obvious surface cracks before suddenly fracture failure of the joints with internal stiffening ribs. Therefore, from the perspective of deformability and anti-fracture performance under the earthquake action, it is not recommended to set internal stiffening ribs in steel tubes to enhance the bearing capacity of the joints in the seismic fortification zone with high intensity.
Keywords: steel tube structure; X-shaped steel joints with circular hollow section braces to square hollow section chord; ultra-low cycle fatigue performance; weld
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