索结构中销轴耳板连接破坏形式及承载力研究

销轴耳板连接是索结构节点常用的连接形式，然而现阶段针对销轴耳板连接的破坏性试验研究相对较少，其破坏机理尚未明确。为探究销轴耳板连接的破坏形式和承载力，设计7个销孔直径为45 mm,端距与边距比值不同的足尺销轴耳板连接试件，并进行拉力破坏性试验。采用有限元软件ABAQUS对其受力性能进行数值模拟，模拟得到的破坏形式与承载力同试验结果基本一致，验证了有限元方法的正确性。基于有限元模型对销轴耳板连接进行参数化分析，研究销孔直径(93、136 mm)、耳板端距(0.5～4倍销孔直径)、耳板边距(0.5～1.5倍销孔直径)等参数对销轴耳板连接破坏形式和承载力的影响，结果表明耳板端距和边距是影响销轴耳板连接破坏形式和承载力的主要因素。通过理论推导和线性拟合的方法得到了孔壁承压破坏、净截面拉断破坏、端部截面剪切破坏下的承载力计算式。通过算例对比分析提出的设计方法与我国GB 50017—2017《钢结构设计标准》、欧洲BS EN 1993-1-8、美国AISC 360-10在相同设计荷载下设计销轴耳板连接时尺寸的差异，并对我国GB 50017—2017《钢结构设计标准》的改进和完善提出相关建议。

Study on failure pattern and bearing capacity of pin-plate connection in cable structures

Pin-plate connection is a common connection form of joint in cable structures. However, the destructive experimental research on pin-plate connection is relatively few at present, and the failure mechanism is still unclear. In order to explore the failure pattern and bearing capacity of the pin-plate connection, seven full-scale pin-plate connection specimens with the pin hole diameter of 45 mm and different ratios of end distance to edge distance were designed, and the tensile failure test was carried out. The software ABAQUS was used to simulate the test. The failure pattern and bearing capacity obtained by the numerical simulation are basically consistent with the test, which validate the finite element method. Then, the finite element method was used to analyze the parameters of pin hole diameter (93 mm,136 mm), end distance of ear plate (0.5-4 times the pin hole diameter), and edge distance of ear plate (0.5-1.5 times pin hole diameter) on the failure pattern and bearing capacity of the pin-plate connection. The results show that the end distance and edge distance of ear plate are the main factors affecting the failure pattern and bearing capacity of pin -plate connection. Through theoretical derivation and linear fitting method, the calculation formulas of bearing capacity under pressure failure of hole wall, tensile failure of the net section, and shear failure of end section were obtained. Finally, the differences of dimensions when designing pin-plate connections under the same design load between the design method proposed in this paper and Chinese code GB 50017—2017, European code BS EN 1993-1-8, and American code AISC 360-10 were compared by calculation examples, and relevant suggestions for the improvement of Chinese code were proposed.