摘要
纵肋上置并形成PBL剪力连接件的钢-UHPC组合桥面板是一种新型桥面结构。该结构采用预制拼装施工,工厂预制钢-UHPC组合梁段,现场进行施工组装,相邻钢梁通过焊接形成一体,而相邻UHPC桥面板则通过现浇UHPC湿接缝连成一体,湿接缝是其薄弱部位。针对该新型结构其湿接缝相关研究较少的问题,该文以某实际工程为背景,完成钢-UHPC组合桥面板湿接缝足尺模型抗弯性能试验。建立Abaqus有限元模型,并采用试验结果校核有限元模型。在此基础上,进行了湿接缝截面模拟方式、钢面板厚度、UHPC层厚度和燕尾榫角度的有限元模型参数分析。对比美国土木工程师协会(ASCE)、《美国房屋建筑规范》(ACI)以及中国《混凝土结构设计规范》(GB 50010—2010)关于构件的刚度计算公式,发现中国规范计算值更接近试验值。基于普通钢筋混凝土梁的抗弯刚度计算公式,结合试验数据进行了参数修正,并用有限元模型结果进行了校核。结果表明:钢-UHPC组合桥面板湿接缝有着优异的延性和刚度;采用摩擦行为模拟湿接缝界面计算成本小且计算效果良好;增加钢板厚度或UHPC层厚度均能有效提高构件刚度和承载力;燕尾榫角度对构件的刚度和承载能力影响很小;参数修正后的抗弯刚度计算公式能较好地计算钢-UHPC组合桥面板构件跨中位移。
Prefabricated steel-UHPC composite bridge deck is a new deck structure system that places the longitudinal rib at the upper layer and forms PBL shear connectors.This structure can be prefabricated in the factory and assembled on-site.The adjacent steel beams are integrated by welding,and the cast in-situ UHPC wet joints connect the adjacent UHPC bridge decks.However,these wet joints represent the structure's vulnerable segments but with little research.To this end,a full-scale model test has been conducted to study the flexural behavior of the wet joints in a steel-UHPC composite bridge deck in a practical project.The Abaqus finite element model was established and verified based on the test results.With experimental validation,the parameters analysis of the finite element model,including the wet-joint simulation method,steel panel thickness,UHPC thickness,and inclination angle of the dovetail tenon,were analyzed.In comparing the stiffness calculation equation within the American Society of Civil Engineers(ASCE),Building Code Requirements for Structural Concrete(ACI),and the Chinese Code GB 50010—2010,it is discerned that the calculated values in the Chinese code are closer to the test values.Based on the flexural stiffness calculation equation for ordinary reinforced concrete beams,the corresponding parameters are modified according to the test data,and the theoretical results are verified with the finite element results.The results show that the wet joints of the steel-UHPC composite bridge deck have excellent ductility and stiffness.Using friction behavior to simulate a wet joint interface has low calculation costs and well-agreed results.Increasing the thickness of the steel panel or UHPC can effectively enhance the stiffness and bearing capacity of the structure.In contrast,the impact of the inclination angle of the dovetail tenon on the structure's stiffness and bearing capacity is minimal.After parameter modification,the modified calculation equation of flexural stiffness can more accurately predict the
作者
廖万成
赵华
安家禾
LIAO Wancheng;ZHAO Hua;AN Jiahe(Key Laboratory for Wind and Bridge Engineering of Hunan Province,School of Civil Engineering,Hunan University,Changsha,Hunan 410082,China)
出处
《中外公路》
2024年第1期102-110,共9页
Journal of China & Foreign Highway
基金
国家自然科学基金资助项目(编号:51978256)。
