震后碳纤维布加固钢筋混凝土构件的设计步骤
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摘要
碳纤维布对于限制设备破坏以及不合格的钢筋混凝土构件的破坏具有很大优势,已经被广泛地用于建筑物抗震的局部修复。通过系统评估各种被加固构件的抗力机理和握裹力作用,探讨了抗震修复/增强技术有关的设计问题和细节准则,包括:屈曲、剪力、互搭接头承载力、塑性铰性能以及与植入钢筋有关的变形能力和包裹应变能力。在循环荷载下采用碳纤维布加固钢筋混凝土梁/柱的已公布的试验数据库,被作为评估细节准则和校准设计下限的参考。同时也对提升设计策略,采用纤维加固控制结构变形的标准进行了探讨。
Fiber reinforced polymer jackets (FRP sheets) offer great advantages as confining devices of damaged or substandard reinforced concrete (r.c.) members and are already used extensively as local interventions in seismic rehabilitation of existing construction. The design issues and detailing rules related to this seismic repair/strengthening technique are explored by evaluating systematically the various mechanisms of resistance of the upgraded member and the jacket contribution.These include flexure,shear,lap-splice capacity,plastic hinge behavior,displacement capacity and jacket strain capacity associated with embedded bar buckling. A database of published experiments on r.c. beam/columns,tested under cyclic loading after being jacketed by FRPs was used as a point of reference in assessing the detailing rules and in calibrating design lower bound expressions.Criteria that should be considered for the upgrade design strategy in order to control the deformation demand of the structure when FRP jackets are used are also discussed in the paper.
Fiber reinforced polymer jackets (FRP sheets) offer great advantages as confining devices of damaged or substandard reinforced concrete (r.c.) members and are already used extensively as local interventions in seismic rehabilitation of existing construction. The design issues and detailing rules related to this seismic repair/strengthening technique are explored by evaluating systematically the various mechanisms of resistance of the upgraded member and the jacket contribution.These include flexure,shear,lap-splice capacity,plastic hinge behavior,displacement capacity and jacket strain capacity associated with embedded bar buckling. A database of published experiments on r.c. beam/columns,tested under cyclic loading after being jacketed by FRPs was used as a point of reference in assessing the detailing rules and in calibrating design lower bound expressions.Criteria that should be considered for the upgrade design strategy in order to control the deformation demand of the structure when FRP jackets are used are also discussed in the paper.
引文
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