FRP约束钢筋混凝土柱非线性阻尼研究

项目名称： FRP约束钢筋混凝土柱非线性阻尼研究

项目编号： No.51278038

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 建筑科学

项目作者： 王元丰

作者单位： 北京交通大学

项目金额： 80万元

中文摘要： FRP加固混凝土已成为被广泛应用的工程结构加固技术。在进行FRP约束混凝土结构抗震分析时，一般取其阻尼系数与混凝土结构相同进行计算，这将使其动力分析结果的可靠性受到很大影响。由于机理尚不非常清楚，试验与理论研究复杂，对于FRP约束混凝土结构的阻尼目前国内外还没有专门研究、尚处空白。 本项目将针对FRP约束混凝土及损伤混凝土的非线性阻尼特性进行研究。首先采用试验方法测定FRP约束钢筋混凝土柱的阻尼以及在水平反复荷载作用下的滞回耗能性能。然后，基于申请者前期工作基础，研究考虑初始损伤以及强弱约束条件下的FRP约束钢筋混凝土柱的滞回性能和阻尼耗能特性，建立其非线性材料阻尼计算公式。基于所建的非线性阻尼模型，建立非线性阻尼系统的动力响应分析方法，对FRP约束钢筋混凝土结构的地震响应进行分析。该项研究有助于非线性阻尼理论和FRP约束混凝土结构抗震分析理论的发展及应用，具有较大原始创新性和挑战性。

中文关键词： FRP约束混凝土柱；损伤；滞回曲线；材料阻尼；动力响应

英文摘要： Externally wrapping fiber-reinforced polymer (FRP) composites has found increasingly wide applications in strengthening and retrofitting of existing concrete structures.In the seismic analysis of FRP-confined RC structures, the constant damping ratio of general (reinfoed concrete)RC structures, instead of a proper damping value, is usually adopted at present due to the complexity in mechanism and the difficulty in experiment, which, however, greatly affects the reliability of the dynamic analysis results. The proper damping value of FRP-confined RC structures has not yet been determined. This project aims to explore into the nonlinear damping characteristics of FRP-confined RC and damaged RC structures. Firstly, test is conducted to observe the damping and hysteretic energy dissipation of FRP-strengthened RC columns. Subsequently, on the basis of previous work, hysteretic performance and hysteretic energy dissipation characteristics of FRP-confined RC columns are investigated considering initial damage and different confinement levels to establish the nonlinear damping formulas. Finally, based on the proposed damping models, an improved method for dynamic analysis considering nonlinear damping is developed to effectively analyze the seismic response of FRP-confined RC structures. This study is of original innova

英文关键词： FRP confined RC columns；damage；hysteretic curves；material damping；dynamic response