纤维预拉杆式自定心屈曲约束支撑的力学性能与设计方法研究

项目名称： 纤维预拉杆式自定心屈曲约束支撑的力学性能与设计方法研究

项目编号： No.51208095

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 建筑环境与结构工程学科

项目作者： 周臻

作者单位： 东南大学

项目金额： 25万元

中文摘要： 基于分灾-耗能理念的屈曲约束支撑(BRB)是减轻结构震害的有效手段。但由于支撑屈服后刚度较低，使得BRB结构在强震后易于产生较大残余变形，增加了结构震后修复的难度和成本。为此，提出在BRB中引入纤维预拉杆式自定心体系(FRP-SC)以解决这一问题。拟通过理论方法-数值模拟-性能试验相结合，从构造、构件和结构层次开展FRP-SC-BRB的力学性能与设计方法研究。构造层次：通过试验研究确定适用于自定心体系的纤维筋材力学性能与锚固系统，解明FRP-SC的工作机制，建立支撑体系的构造设计原则；构件层次：通过拟静力试验与数值模拟，研究关键构造参数对FRP-SC-BRB滞回性能的影响规律，构建反映支撑滞回耗能与自定心特征的力学模型；结构层次：通过FRP-SC-BRB减震结构的非线性动力分析与振动台试验，研究支撑滞回性能参数对结构抗震性能的影响规律，提出同时考虑结构位移与残余变形性能约束的直接设计方法。

中文关键词： 自定心结构；纤维复合筋；屈曲约束支撑；残余位移；设计方法

英文摘要： The buckling-restrained brace (BRB) based on disaster-reduction and energy-dissipation concept is an effective measure to reduce structural seismic damage. For the relatively low post-yield stiffness of the brace, BRB structures are prone to large residual lateral deformations, leading to the increasing difficulty and cost for structural renovation after earthquake. Therefore, the self-centering system with pretensioned fiber-reinforced-plastic bars (FRP-SC) is introduced to solve this problem. Through the incorporation of theoretical method, numerical simulation and performance experiment, the mechanic performance and design method of FRP-SC-BRB are investigated from three levels: construction, member, and structure. In the construction level, the mechanic performance and anchorage method of appropriate FRP bar for self-centering system is determined through experiments, the working mechanism of FRP-SC-BRB is studied, and the construction design principle is established for brace system. In the member level, through quasi-static loading experiments and numerical simulations, the influence of key construction parameters on the hysteretic performance of FRP-SC-BRB is investigated, and the mechanic model reflecting the energy-dissipation and self-centering characteristics of brace systems is constructed. In the st

英文关键词： self-centering structures；FRP composite tendons；buckling restrained braces；residual deformations；design methodology