Mechanical Properties and Stress Transfer Characteristics of Reinforcement Materials for Concrete Demanded by Structural Performance of Frame and Members

框架及构件结构性能要求的混凝土用增强材料的力学性能及应力传递特性

• 批准号: 11450208
• 负责人: TASAI Akira
• 金额: $ 9.02万
• 依托单位: Yokohama National University (2001)Kyoto University (1999-2000)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450208/
• 关键词: Concrete; Reinforcement material; Continuous fiber; Bond; Shear; Confinement; Section analysis; Mechanical anchorage; 鉄筋コンクリート; 補強財; 応力-ひずみ曲線; 付着すべり; ひびわれ; 曲げ; 応力―ひずみ曲線; 繊維補強材; 高強度鉄筋; Concrete; Reinforcement material; Continuous fiber; Bond; Shear; Confinement; Section analysis; Mechanical anchorage; 鉄筋コンクリート; 補強財; 応力-ひずみ曲線; 付着すべり; ひびわれ; 曲げ; 応力―ひずみ曲線; 繊維補強材; 高強度鉄筋

Experimental and analytical investigations were conducted on the mechanical characteristics of hybrid RC members reinforced by continuous fibers. The members consisted of different kinds of reinforcement with respect to strength, elastic modulus, hysteric response and ductility. The properties related to flexural, shear and bond characteristics were mainly discussed. Carbon fibers were more effective than aramid fibers to reinforce concrete members, because the high elastic modulus of carbon fibers performed to prevent expanding of cracks. Conventional formulas recommended in AIJ guidelines or formulas by modified compression field theories overestimated the shear strength of hybrid RC members. However, analysis based on truss analogy combined with sector truss mechanism considering bond stress distribution along main steel rebar well-predicted experimental results, Experimental and analytical investigations were also conducted to study development of damages in hinge zones of reinforced concrete columns. Sufficient confinement for hinge zones was significantly effective to control the deterioration of bending moment capacity to be small. Simple inelastic section analysis considering confinement for concrete predicted the observed moment vs. curvature and axial strain vs. curvature relationships precisely. Accurate formula to estimate anchorage strength of main rebar anchored mechanically into RC members was proposed in case of side-splitting failure of concrete around the rebar.

对连续纤维增强的混合RC成员的机械特性进行了实验和分析研究。成员由各种强度，弹性模量，歇斯底里反应和延展性组成。主要讨论了与弯曲，剪切和键特性相关的特性。碳纤维比芳香纤维更有效，可以增强混凝土成员，因为进行的碳纤维的高弹性模量是为了防止裂纹扩大。通过修改的压缩场理论在AIJ指南或公式中推荐的常规公式高估了混合RC成员的剪切强度。然而，基于桁架类比的分析以及考虑沿主要钢钢筋的键应力分布的扇形桁架机制，还进行了良好预测的实验结果，还进行了实验和分析研究，以研究钢筋混凝土柱的铰链区域的损坏开发。足够的铰链区域的限制非常有效地控制弯矩较小的弯矩能力的恶化。简单的非弹性截面分析考虑了混凝土的限制，预测了观察到的力矩与轴向应变与曲率关系。如果在钢筋周围的混凝土侧面拆分失败的情况下，提出了精确的公式以机械固定在RC成员中的锚固强度。