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研究显示铆接铁路桥梁的双角钢纵横梁连接容易在扭曲应力作用下发生疲劳开裂。扭曲应力由纵梁端部转角引起,不易计算,因此,需要使用更详细的分析技术来量化连接件的性能。研究以下连接件参数对应力集中的影响:1)角钢肢脚长度;2)角钢肢背长度;3)角钢厚度;4)2590kN轨道车荷载作用下纵梁长度对弯矩-转角特性的影响。使用3D或2D有限元软件对72个独立的双角钢连接构件进行分析。分析每个角钢连接件的极限应力,并通过线性回归分析法得出应力计算方程。所建方程为连接件参数的函数,能够简单有效地计算角钢连接件应力变化范围的大小,无需进行精确的分析便可对疲劳寿命进行评估。
The research shows that the double angle beam connection of riveted railway bridges is prone to fatigue cracking under the effect of twisting stress. Torsional stress is caused by the corners of the stringers and is not easy to calculate, so more detailed analysis techniques are needed to quantify the performance of the connector. The influence of the following connection parameters on the stress concentration is studied: 1) the limb length of the angle bar; 2) the limb length of the angle bar; 3) the thickness of the angle bar; 4) the effect of the length of the stringer on the moment-rotation angle under 2590kN railcar load. Seventy-two independent double angle steel connecting members were analyzed using 3D or 2D finite element software. The ultimate stress of each angle connection was analyzed and the stress calculation equation was derived by linear regression analysis. The built-in equation is a function of the connector parameters, which allows the simple and efficient calculation of the range of stress changes in the angle connections, allowing the fatigue life to be assessed without the need for an accurate analysis.