Behaviour of FRP-reinforced concrete beam-column joints

FRP钢筋混凝土梁柱节点性能

• 批准号: 249621-2007
• 负责人: ElSalakawy, Ehab
• 金额: $ 1.38万
• 依托单位: University of Manitoba
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2010
• 资助国家: 加拿大
• 起止时间: 2010-01-01 至 2011-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=455335
• 关键词: Behaviour; FRP; reinforced; concrete; beam

Corrosion of steel reinforcement has led to high maintenance and repair cost for concrete structures especially those built in harsh environments. Recent research indicated that the individual concrete members (beams, slabs, and columns) reinforced with the non-corrodible fibre reinforced polymer (FRP) composite bars behaved well under both monotonic and cyclic loading conditions. However, very limited work was conducted on the connections (joints) of these individual members to form a frame structure. Joints are required to function as restraint to adjoining column and beam members and develop their full inelastic capacity if necessary. Since FRP bars have a linear elastic behaviour till failure and show reduced strengths when bent or subjected to compressive stresses, there are concerns on the ductility performance and the integrity of such joints when FRP bars are use, especially under seismic loads. This research program will focus on investigating the behaviour of FRP-reinforced concrete beam-column joints. The research program consists of laboratory investigation and analytical modelling. Full-scale FRP-reinforced concrete beam-column joints (interior and exterior) will be tested in the laboratory. The test parameters will include the type of loading (monotonic or cyclic), the amount of confinement for the joint core (bar diameter and spacing of FRP stirrups), column axial load, concrete strength, FRP main reinforcement type and ratio, and detailing of reinforcement. Nonlinear finite element analysis will be used to model the complex distribution of stresses and strains at the joint panel in lights of the essential differences in mechanical properties and bond characteristics between FRP and steel bars. This model will be incorporated into a computer code, which will be calibrated against the experimental results. Then, the computer code will be used to perform parametric studies to investigate a wide range of factors that are expected to affect the behaviour of such joints. The test results will be formulated into design equations for ductile and integral beam-column joints. This research leads to new structures with improved performance, better durability and less life-cycle cost.

钢筋腐蚀导致混凝土结构（尤其是在恶劣环境下建造的混凝土结构）的维护和修理成本高昂。最近的研究表明，用耐腐蚀纤维增强聚合物（FRP）复合筋加固的单个混凝土构件（梁、板和柱）在单调和循环载荷条件下均表现良好。然而，对这些单独构件的连接（接头）进行了非常有限的工作以形成框架结构。接头需要对相邻的柱和梁构件起到约束作用，并在必要时发挥其全部非弹性能力。由于 FRP 筋在失效之前具有线性弹性行为，并且在弯曲或承受压应力时强度会降低，因此在使用 FRP 筋时，特别是在地震载荷下，人们会担心这种接头的延展性和完整性。该研究计划将重点研究玻璃钢钢筋混凝土梁柱节点的性能。该研究计划包括实验室调查和分析模型。全尺寸玻璃钢钢筋混凝土梁柱节点（内部和外部）将在实验室进行测试。测试参数将包括荷载类型（单调或循环）、接头核心的约束量（钢筋直径和FRP箍筋间距）、柱轴向荷载、混凝土强度、FRP主钢筋类型和比率以及钢筋细节。鉴于FRP与钢筋之间力学性能和粘结特性的本质差异，采用非线性有限元分析对节点面板处应力和应变的复杂分布进行建模。该模型将被纳入计算机代码中，并根据实验结果进行校准。然后，计算机代码将用于执行参数研究，以调查预计会影响此类关节行为的各种因素。测试结果将被制定为延性和整体梁柱节点的设计方程。这项研究带来了具有改进性能、更好耐用性和更低生命周期成本的新结构。