钢-混凝土组合箱梁疲劳性能的有限元分析

Finite element analysis of fatigue behavior for steel- concrete composite box beam

为提高组合箱梁的抗疲劳性能,采用ANSYS软件进行数值模拟与研究。根据已有试验,建立3根具有不同剪力连接度的组合箱梁模型,验证有限元模型的适用性。进一步分析计算一系列变参数的组合箱梁试件,研究不同因素对疲劳性能的影响。研究结果表明:组合箱梁翼板厚度及跨度的改变对组合箱梁疲劳性能有较大影响,而混凝土强度及钢箱梁高度的改变对组合箱梁疲劳性能影响较小。建议工程上通过增加混凝土翼板厚度改善组合箱梁的抗疲劳性能。

To improve the fatigue performance of composite box girders, ANSYS software was adopted to conduct numerical simulation and research. Firstly according to the existing tests, three box girder models with different combinations of shear connection degree were established to verify the applicability of the finite element model. Further, a series of varying parameters for composite box girder specimens were analyzed and calculated to study the effect of different factors on fatigue performance. The results show that, changing the flange thickness and span of box girder has a greater impact on the fatigue performance of composite box girder, while there exists little effect for the change of the strength of concrete and steel box girder height. In practical engineering, it is suggested that increasing the thickness of the concrete flange is an effective way to improve the girders＇ fatigue behavior.