Lateral Confinement of Concrete Using High-Strength Fiber Reinforcement

用螺旋缠绕法对混凝土进行侧向约束 环氧树脂浸渍的高强度芳族聚酰胺纤维的预张紧带 增加混凝土表面的抗压强度 混凝土，增加最大可达到的应变（延展性）， 提供抗剪切机制，并抑制纵向 钢筋屈曲纤维胶带的主要优点 与钢绞线或钢棒相比， 低轮廓，无腐蚀，即使在 棱柱形截面和自动安装。 在这 项目，这是一个广泛的实验和分析研究， 采用1/4比例进行加固修复技术 具有不同横截面和纵向/横向的试样 钢筋特性，并受到组合 循环载荷（轴向、剪切和弯曲）。 加强带 由编织芳纶（凯夫拉）纤维制成的扁平管组成 具有不同的面积、螺距和预应力水平， 研究了 三井以前建造的绕线机 建筑公司与本PI的参与，用于 建议的研究，目的是继续和改进 关于使用新建筑的国际科学合作 材料.

Lateral confinement of concrete by means of spirally winding a pretensioned tape of epoxy-impregnated high-strength aramid fiber onto the concrete surface increase the compressive strength of concrete, increases the maximum attainable strain (ductility), provide a mechanims for shear resistance, and inhibits longitudinal reinforcement buckling. The primary advantages of fiber-made tapes as compared to steel strands or rods are: higher contact area and low profile, no corrosion, possibility of pretensioning even with prismatic cross sections, and automatic installation. In this project, an extensive experimental and analytical study of this strengthening/repair technology is conducted using 1/4 scale specimens with different cross sections and longitudinal/transverse steel reinforcement characteristics, and subjected to combined cyclic loads (axial, shear, and bending). The reinforcing tape consists of a flattened tube made of braided aramid (Kevlar) fiber with different areas, spiral pitches, and levels of prestress being investigated. A winding machine previously constructed by Mitsui Construction Co. with the participation of this PI, is used for the proposed research with the objective of continuing and improving international scientific cooperation on the use of new construction materials.