滑动支座是斜拉桥常用的支座类型,也是桥梁重要的传力构件之一。滑动支座在运营过程中经常产生磨损导致性能退化,分析滑动支座性能变化对斜拉桥整体力学性能的影响具有重要的意义。本文基于考虑支座磨损的斜拉桥有限元模型,分析了滑动支座磨损对斜拉桥静动力性能的影响。以某斜拉桥为算例,建立了考虑支座磨损的斜拉桥有限元模型,分析了滑动支座发生磨损时斜拉桥的静动力性能变化。研究表明,滑动支座磨损将使桥梁刚度增加,导致斜拉桥频率增加,尤其是纵飘与竖弯振型,显著增加梁端轴力,降低支座累计位移。支座不能适应主梁的变形需求,造成主梁与支座内力积聚,受损风险增加,影响到桥梁的安全运营。该研究可对斜拉桥支座损伤识别与桥梁养护提供一定的指导建议。

Sliding bearing is a commonly used type of bearing in cable-stayed bridges, which is also one of the important force transmitting components of bridges. Sliding bearing is often worn during operation, resulting in performance degradation. It is of great significance to analyze the influence of sliding bearing performance changes on the overall mechanical properties of cable-stayed bridges. Based on the finite element model of cable-stayed bridge considering bearing wear, this paper analyzes the influence of sliding bearing wear on the static and dynamic performance of cable-stayed bridge. Taking a cable-stayed bridge as an example, the finite element model of cable-stayed bridge considering bearing wear is established, and the change of the static and dynamic performance of the cable-stayed bridge is analyzed when the sliding bearing is worn. It is shown that sliding bearing wear will increase the bridge stiffness, leading to an increase in frequency, especially longitudinal drift and vertical bending modal, increase the girder end axial force significantly and reduce the cumulative bearing displacement. The bearing cannot adapt to the deformation needs of the girder, resulting in a buildup of internal forces in girder and bearing. This can lead to an increased risk of damage and affect the safe operation of the bridge. This study can provide some guiding suggestions for bearing damage identification and bridge maintenance of cable-stayed bridges.

国家自然科学基金(Nos. 52438003, 2250011, 52078102, 52322807)