摘要
针对上承式板桁组合桁梁桥中普通混凝土桥面板抗裂性能差的问题,提出了钢-钢纤维混凝土组合桥面板。为研究该组合桥面板的轴拉力学性能、抗裂性能,设计了3种不同形式桥面板的轴拉性能对比试验,包括纯钢纤维混凝土桥面板、平钢板-钢纤维混凝土组合桥面板及球扁钢肋加劲的钢-钢纤维混凝土组合桥面板。测试了钢纤维混凝土初始开裂荷载、裂缝随轴向拉力的变化、桥面板的变形、承载力等。结果表明:采用钢纤维混凝土的桥面板在轴向拉力作用下,混凝土开裂特征为多条细微裂缝,与常规的混凝土板开裂特征不同;纯钢纤维混凝土桥面板在轴向拉力作用下的破坏形态为桥面板中的纵向钢筋在连接处破坏,平钢板-钢纤维混凝土组合桥面板及球扁钢肋加劲的钢-钢纤维混凝土组合桥面板的破坏形式为钢板屈服。不同形式的桥面板在正常使用状态下的受力性能各不相同,总体上随着底部钢板面积的增加,桥面板的受力性能更加优异;当纵向钢筋应力水平为100 MPa时,平钢板-钢纤维混凝土组合桥面板和球扁钢肋加劲的钢-钢纤维混凝土组合桥面板所承载的轴拉力分别是纯钢纤维混凝土桥面板的4倍和6.7倍。
Aiming at resolving the problem of the poor crack resistance performance of common concrete bridge deck which is used in plate and truss composite girder bridges, composite bridge deck system composed of steel plate and steel fiber reinforced concrete is proposed. In order to investigate the axial tension behavior and crack resistance performance of this composite bridge deck, axial tensile tests were conducted on three types of bridge deck, including steel fiber reinforced concrete slab, steel plate-steel fiber reinforced concrete composite slab and orthotropic steel bridge deck-steel fiber reinforced concrete composite slab. The initial crack load, axial tensile load-maximum crack width curves of the steel fiber reinforced concrete, axial tensile load-axial deformation and the load carrying capacity of the slab were measured. The experimental results show that the steel fiber reinforced concrete slab is full of numerous tiny cracks which is totally different from common concrete. In addition, the failure mode of steel fiber reinforced concrete slab under axial tension is the fracture of longitudinal reinforcement at the connection, while it is the yielding of steel plate for composite slabs. The tensile behaviors of three new types slabs are different in serviceability limit state. The trend is the larger area of steel plate, the better the tension behavior of the composite slab. And the load-carrying capacity of steel plate-steel fiber reinforced concrete composite slab and orthotropic steel bridge deck-steel fiber reinforced concrete composite slab are 4 times and 6.7 times of that of steel fiber reinforced concrete slab respectively when the tensile stress of longitudinal reinforcement is 100 MPa.
作者
史占崇
苏庆田
戴昌源
SHI Zhanchong;SU Qingtian;DAI Changyuan(College of Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2019年第S01期47-53,共7页
Journal of Building Structures
基金
江西省重大研发专项(20165ABC28001).
关键词
板桁组合桁梁
组合桥面板
钢纤维混凝土
轴拉性能试验
抗裂性能
plate-truss composite truss girder
composite bridge deck
steel fiber reinforced concrete
axial tension experiment
crack resistance performance
