局部低强防屈曲支撑耗能性能试验研究

发布时间：2018-05-07 16:25

本文选题：局部低强防屈曲支撑 + 超高温热处理　；参考：《天津大学学报(自然科学与工程技术版)》2017年S1期

【摘要】：传统防屈曲支撑主要采用内芯截面切削的方式实现局部削弱以提前进入塑性耗能,而本研究基于局部强度弱化热处理技术,在不削弱截面尺寸的情况下实现定区域的钢材强度削弱,提出了新型局部低强防屈曲支撑构造.通过对两种不同方式热处理后的材性试验,验证了超高温缓慢冷却热处理过程对于钢材强度削弱的有效性以及采用陶瓷加热器系统实现大尺寸构件局部热处理的可行性.通过两组局部低强防屈曲支撑循环往复荷载作用下的拟静力试验,研究了局部低强防屈曲支撑的耗能性能以及不同约束单元设计对其耗能性能的影响.结果表明:局部低强防屈曲支撑滞回曲线饱满,延性及抗低周疲劳性能优于普通防屈曲支撑,且可满足抗震设计的要求,其破坏模式和耗能能力与外围约束单元强度和刚度有关,且局部低强防屈曲支撑设计时需考虑外伸连接段稳定问题.
[Abstract]:The traditional anti-buckling braces mainly use the core cross-section cutting method to achieve local weakening to advance into the plastic energy dissipation, but this study is based on the local strength weakening heat treatment technology. A new type of local low strength buckling bracing structure is proposed to reduce the strength of steel in the fixed area without weakening the section size. The effectiveness of slow cooling heat treatment at ultra-high temperature to weaken the strength of steel and the feasibility of partial heat treatment of large-sized components with ceramic heater system were verified by the experiments on the material properties of two different heat treatment methods. Based on the quasi-static tests of two groups of local low strength buckling braces under cyclic cyclic loading, the energy dissipation performance of local low strength buckling braces and the effect of different constraint element design on their energy dissipation performance are studied. The results show that the hysteretic curves of local low strength buckling braces are full, ductility and low cycle fatigue resistance are better than those of common buckling braces, and the hysteretic curves of local low strength buckling braces can meet the requirements of seismic design. The failure mode and energy dissipation ability are related to the strength and stiffness of the external restraint element, and the stability of the extension connection should be considered in the design of the local low strength buckling braces.
【作者单位】：水利工程仿真与安全国家重点实验室(天津大学);天津大学建筑工程学院;
【基金】：中国博士后科学基金面上资助项目(2016M590202)
【分类号】：TU352.1;TU391

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