Seismic behavior of deficient reinforced concrete bridge piers confined with FRP – A fractional factorial analysis
Seismic behavior of deficient reinforced concrete bridge piers confined with FRP – A fractional factorial analysis
复制标题
DOI：
10.1016/j.engstruct.2016.08.011
复制
发表时间：
2016-11
影响因子：
5.5
通讯作者：
Anant Parghi;M. Alam
中科院分区：
文献类型：
--
作者：
Anant Parghi;M. Alam
材料特性、纵、横向配筋量、外部约束、轴向荷载和剪跨比等因素对加固后桥墩在地震荷载作用下的水平承载力、延性和破坏形态均有影响。这些参数是相当不同的老钢筋混凝土（RC）桥墩相比，抗震设计的桥梁。采用部分析因设计方法，研究了这些因素及其交互作用对碳纤维布（CFRP）约束的钢筋混凝土抗震圆形桥墩极限状态的影响。采用纤维建模方法对碳纤维布约束的桥墩进行建模，并对桥墩进行非线性静态推覆分析，以确定不同极限状态的顺序，例如钢筋的屈服、屈曲和断裂以及混凝土的压碎沿着延性。墩的能力。研究表明，剪跨比、屈服强度、纵筋配筋率、轴向荷载和CFRP约束对加固桥墩的横向承载力、延性和破坏形态有显著影响。
Material properties, amount of longitudinal and transverse steel, external confinement, axial load and shear span-depth ratio affect the lateral load capacity, ductility and failure mode of retrofitted bridge piers under seismic load. These parameters are considerably different in old reinforced concrete (RC) bridge piers compared to the seismically designed bridges. This research investigates the effects of these factors and their interactions on the limit states of carbon fiber reinforced polymer (CFRP) confined seismically deficient RC circular bridge piers using fractional factorial design method. CFRP-confined bridge piers are modelled using a fiber modelling approach and nonlinear static pushover analyses of the bridge piers are conducted in order to determine the sequence of different limit states such as yielding, buckling and fracture of reinforcement, and concrete crushing along with ductility capacity of the piers. This study shows that the shear span-depth ratio, yield strength and longitudinal reinforcement ratio, axial load and CFRP confinement significantly affect the lateral load capacity, ductility and the failure mode of retrofitted bridge piers under seismic load.