基于扩展有限元的钢-STC组合桥面开裂性能研究  

Study on Cracking Performance of Steel-STC Composite Bridge Deck Based on Extended Finite Element Method

作　　者：聂建明 NIE Jianming(Tianjin Railway Construction Co.,Ltd.,of China Railway Sixth Engineering Group,Tianjin 300142,China)

机构地区：[1]中铁六局集团天津铁路建设有限公司,天津300142

出　　处：《国防交通工程与技术》2023年第2期18-22,27,共6页Traffic Engineering and Technology for National Defence

摘　　要：采用H型钢-超高韧性混凝土(STC)板的组合结构形式可有效改善传统正交异性钢桥面-超高韧性混凝土组合桥面结构中存在的结构疲劳开裂问题。为了研究不同结构参数对H型钢-STC组合桥面结构开裂性能的影响规律,基于ABAQUS以及扩展有限元方法(XFEM)建立了考虑裂纹扩展的组合梁有限元模型,对不同桥面板厚度、配筋率条件下开裂性能以及延性的变化规律开展了有限元模拟研究。研究结果表明,与采用普通混凝土(C50)相比,不同混凝土板厚度条件下,采用STC对开裂强度与延性的提升效果最大分别为175.0%与446.3%,而不同配筋率条件下的提升效果最大可达205.1%与1330.3%。为H型钢-STC组合桥面结构在实际桥梁工程中的应用提供相应的技术支撑与建议。The structural fatigue cracking problem of the traditional orthotropic steel deck and super toughness concrete(STC)composite deck structure can be effectively improved by adopting the composite structure of H-shaped steel and STC slab.In order to study the influence of different structural parameters on the cracking performance of H-shaped steel and STC composite deck structure,a finite element model of H-shaped steel and STC composite beam considering crack propagation was established based on ABAQUS and extended finite element method(XFEM).The finite element simulation study was carried out on the cracking performance and ductility of H-shaped steel and STC composite beam under different deck thickness and reinforcement ratio.The results show that compared with ordinary concrete(C50),the maximum improvement effects of STC on cracking strength and ductility are 175.0%and 446.3%,respectively,under different concrete slab thicknesses;Moreover,under different reinforcement ratios,the maximum increase effect can reach 205.1%and 1330.3%,respectively.Therefore,this study provides corresponding technical support and suggestions for the application of H-shaped steel and STC composite deck structure in the actual bridge engineering.

关 键 词：钢-混凝土组合桥面 超高韧性混凝土(STC) 桥面板厚度 配筋率 开裂性能 延性 

分 类 号：U443.31[建筑科学—桥梁与隧道工程]