摘要
将正交异性钢桥面板的纵肋开孔并上置作为剪力连接件(PBL剪力键,PBL为德语Perfobond Leiste的缩写,意同英文的Perfobond rib或Perfobond strip),使钢板和UHPC(Ultra-High Performance Concrete,超高性能混凝土)形成组合桥面结构,具有解决传统正交异性钢桥面板易疲劳开裂和铺装层易损坏的问题的潜力。为了研究该组合结构的抗弯性能,基于某实桥其钢板-UHPC组合桥面板的设计,进行足尺条带模型正弯矩加载试验,得到其荷载-挠度关系,裂缝发展和分布情况、钢板和UHPC的荷载-应变关系以及底钢板与UHPC界面的相对滑移情况等。静载试验结果表明:横截面变形基本符合平截面假定,PBL剪力连接件能保证底钢板与UHPC层的协同受力,同时,该结构具有良好的延性。基于试验结果,采用3种不同的方式模拟钢板和UHPC的界面行为,建立了Abaqus有限元模型。对比发现,采用“面-面接触(无摩擦)”方式模拟UHPC和钢板的接触行为的有限元模型其计算结果与试验值吻合更好。利用该模型进一步进行参数分析,探究UHPC层厚度、底钢板厚度、顶层和底层纵向钢筋的直径,开孔板孔距等因素对构件抗弯性能的影响。计算结果表明,UHPC层厚度、底钢板厚度是影响钢板-UHPC组合板抗弯性能的关键因素。
The longitudinal ribs of orthotropic steel deck are perforated and connected on the top of steel plate as shear connectors of steel plate-UHPC composite deck, which presents a potential to solve the problems of fatigue cracking in orthotropic steel decks and premature damage in asphalt overlays. In order to study the flexural behavior of this structure, a full-scale strip based on the steel plate-UHPC composite deck of a real project was tested. The responses of the specimen were captured and discussed from different aspects including the failure mode, the load deflection curve, the strain distribution, the cracking status, and the interfacial slip as well. Test results show that the cross-sectional deformation is linear, which proves that perfobond rib shear connectors ensure steel plate and UHPC working together. And this structure is ductile. Based on test results, the interface behavior between steel plate and UHPC was simulated in two different ways, then three Abaqus finite element models were established. Compared with another two models, the calculation results of the model using the surface-to-surface contact(frictionless) are in better agreement with the experimental data. Further parametric analysis was carried out to explore the effect of the thickness of UHPC and steel plate, the diameter of longitudinal reinforcement, the hole spacing of PBL and etc. The calculation results show that the thickness of UHPC and steel plate are main factors affecting the flexural performance of steel plate-UHPC composite slab.
作者
刘瑞
赵华
安家禾
LIU Rui;ZHAO Hua;AN Jiahe(School of Civil Engineering,Hunan University,Changsha 410083,China)
出处
《铁道科学与工程学报》
EI
CAS
CSCD
北大核心
2023年第2期628-640,共13页
Journal of Railway Science and Engineering
基金
国家自然科学基金面上项目(51978256)。
关键词
钢板-UHPC组合桥面板
PBL剪力键
有限元
参数分析
steel plate-UHPC composite deck
Perfobond rib shear connectors
finite element
parameter analysis
