基于大应变FRP的自复位摩擦耗能支撑抗震性能研究

Study on Seismic Performance of Self-centering Energy Dissipative Brace Based on LRS FRP

为了降低地震对工程结构的影响,消耗地震输入的能量,同时尽可能减少结构的残余变形,提出了一种基于大应变纤维增强聚合物的新型自复位摩擦耗能支撑。首先阐述了支撑的设计过程与工作机理,并对其相关参数进行了研究,评估了关键参数对支撑性能的影响;然后对支撑进行了拟静力试验(试验共包括3组工况),通过分析各工况中支撑力-位移曲线,验证了支撑的耗能能力与自复位能力;最后基于ABAQUS软件平台对支撑进行了数值模拟。试验与数值模拟结果均表明,将LRS FRP应用在自复位摩擦耗能支撑中具有良好的耗能效果和一定的自复位能力,在工程结构抗震加固中有潜在的应用可能性。

In order to reduce the impact of earthquakes on engineering structures,consume energy input from earthquakes,and minimize the residual deformation of structures,a new self-centering energy dissipative brace(SCEDB)based on large rupture strain fiber reinforced polymer(LRS FRP)was proposed.Firstly,the design process and working mechanism of the support are expounded.The relevant parameters were studied to evaluate the influence of key parameters on the support performance;Then,the quasi-static test of the support was carried out,including three groups of working conditions.The energy dissipation capacity and self-centering ability of the brace were verified by analyzing the support-displacement curves of the brace in each working condition;Finally,the brace was numerically simulated based on the ABAQUS software platform.Both the experiment and numerical simulation results show that the application of LRS FRP in the SCEDB has good energy dissipation effect and certain self-centering ability,which has potential application possibilities in the seismic reinforcement of engineering structures.