考虑铰缝构造与损伤参数的空心板桥荷载横向分布性能分析

Analysis on Load Transverse Distribution Performance of Hollow Slab Bridge Considering Hinge Joint Structure and Damage Parameters

摘要:

为探究铰缝构造和损伤参数对装配式空心板桥荷载横向分布性能的影响，为空心板桥的设计优化和状态评估提供定量依据，以某简支空心板梁桥为工程背景，采用ABAQUS软件建立精细化实体有限元模型，系统分析铰缝构造尺寸（大、中、小）、损伤程度（弹性模量折减0%~75%）、损伤长度（0~25 m）、铰缝钢筋配置等参数的敏感性。研究结果表明：大铰缝构造具有最优的横向荷载传递性能，与铰接板梁法计算结果吻合良好；设置铰缝钢筋可显著增强桥梁横向整体性，使荷载横向分布系数最大降低10.14%；铰缝损伤会削弱桥梁结构的横向传力能力，其中损伤程度达75%、损伤长度增至25 m时，将分别导致荷载横向分布系数较无损状态最大增加8.53%、3.66%，且损伤长度超过15 m后其影响趋于稳定。因此，优化铰缝构造和配筋是提升桥梁横向整体性的关键。

Abstract:

To explore the influence of hinge joint structure and damage parameters on the load transverse distribution performance of prefabricated hollow slab bridges, a quantitative basis is provided for the design optimization and status evaluation of hollow slab bridge. Taking a simple-supported hollow slab beam bridge as the engineering background, a refined solid finite element model is established by using ABAQUS software systematically to analyze the sensibility of parameters such as hinge joint structure sizes (large, medium and small), damage degree (0%-75% reduction in elastic modulus), damage length (0-25 m), and hinge joint reinforcement configuration. The research result shows that the large hinge joint structure exhibits the optimal load transverse transfer performance and the good agreement with the calculation results of the hinged slab beam method. The setup of hinge joint reinforcement can significantly enhance the transverse integrity of the bridge, reducing the transverse distribution coefficient of the load by up to 10.14% at most. The damage of hinge joint will weaken the transverse load-carrying capacity of the bridge structure, in which when a damage degree is to 75% and a damage length increases to 25 m, the maximum increase of 8.53% and 3.66% will be resulted respectively in the transverse distribution coefficient of the load compared with the non-destructive state. And when the damage length exceeds 15 m, its influence tends to stabilize. Therefore, the optimization of hinge joint structure and reinforcement is the key to improve the transverse integrity of the bridge.