Innovative hybrid reinforcement constituting conventional longitudinal steel and FRP stirrups for improved seismic strength and ductility of RC structures
Innovative hybrid reinforcement constituting conventional longitudinal steel and FRP stirrups for improved seismic strength and ductility of RC structures
复制标题
DOI：
10.1007/s11709-015-0295-9
复制
发表时间：
2016-01
影响因子：
3
通讯作者：
M. Fakharifar;A. Dalvand;M. Sharbatdar;Genda Chen;L. Sneed
中科院分区：
文献类型：
--
作者：
M. Fakharifar;A. Dalvand;M. Sharbatdar;Genda Chen;L. Sneed
在新结构的建设中，使用纤维增强聚合物（FRP）加固变得越来越有吸引力。然而，当需要显着的材料非弹性来通过滞后循环耗散输入能量时，FRP 材料在破裂之前的固有线弹性行为被认为是地震攻击下的主要缺点。此外，成本考虑，包括玻璃钢材料和预制玻璃钢结构的构造，特别是箍筋，以及运输到现场时可能损坏环氧树脂涂层纤维都是值得注意的问题。目前的研究为下一代基础设施提出了一种新颖的经济混合加固方案，该方案采用由 FRP 板组成的现场制造的 FRP 箍筋。混合钢筋由常规纵向钢筋和FRP箍筋组成。所提出的混合钢筋的主要特点是由于 FRP 箍筋向纵向钢筋和核心混凝土提供了相当大的围压，因此增强了强度和延展性。钢筋混凝土梁试件和梁柱节点试件进行了测试，以实现所提出的混合加固。与传统的钢箍筋相比，所提出的混合钢筋具有更高的强度、刚度和能量耗散。本文详细讨论了所提出的混合加固的设计方法、结构行为和适用性。
The use of fiber reinforced polymer (FRP) reinforcement is becoming increasingly attractive in construction of new structures. However, the inherent linear elastic behavior of FRP materials up to rupture is considered as a major drawback under seismic attacks when significant material inelasticity is required to dissipate the input energy through hysteretic cycles. Besides, cost considerations, including FRP material and construction of pre-fabricated FRP configurations, especially for stirrups, and probable damage to epoxy coated fibers when transported to the field are noticeable issues. The current research has proposed a novel economical hybrid reinforcement scheme for the next generation of infrastructures implementing on-site fabricated FRP stirrups comprised of FRP sheets. The hybrid reinforcement consists of conventional longitudinal steel reinforcement and FRP stirrups. The key feature of the proposed hybrid reinforcement is the enhanced strength and ductility owing to the considerable confining pressure provided by the FRP stirrups to the longitudinal steel reinforcement and core concrete. Reinforced concrete beam specimens and beamcolumn joint specimens were tested implementing the proposed hybrid reinforcement. The proposed hybrid reinforcement, when compared with conventional steel stirrups, is found to have higher strength, stiffness, and energy dissipation. Design methods, structural behavior, and applicability of the proposed hybrid reinforcement are discussed in detail in this paper.