Q235钢芯材屈曲约束支撑的超强特性研究

发布时间：2018-07-02 13:59

本文选题：屈曲约束支撑 + 超强系数　；参考：《建筑结构学报》2016年03期

【摘要】：以国内外近年来的各类型屈曲约束支撑(BRB)的试验数据为基础,提出了与BRB承载力超强相关的应变硬化系数和拉压不平衡系数上限值的计算公式。设计并完成了7组Q235钢芯材BRB轴心受力试验,分析了超强系数与峰值应变和累积塑性应变之间的关系,研究了加载速率对超强系数的影响。结果表明:虽然离散性较大,但Q235钢芯材BRB的应变硬化系数和拉压不平衡系数均表现出随峰值应变的增大而增大的趋势。在设计中可采用建议的超强系数包络值以更加合理地考虑BRB的超强特性。BRB是位移相关型消能器,但试验中BRB试件在应变速率约为0.1/s的动力加载作用下的拉压不平衡系数明显大于相同峰值应变下静力加载试验结果,说明加载速率对BRB受压性能影响明显,对该现象有待深入研究。
[Abstract]:Based on the experimental data of various types of buckling restrained braces (BRB) at home and abroad in recent years, the formulas for calculating the upper limit values of strain hardening coefficient and tension and compression unbalance coefficient related to the bearing capacity of BRB are put forward. Seven groups of Q235 steel core BRB axial stress tests were designed and completed. The relationship between the superstrength coefficient and the peak strain and the cumulative plastic strain was analyzed, and the effect of loading rate on the superstrength coefficient was studied. The results show that the strain hardening coefficient and tension and compression unbalance coefficient of Q235 steel core BRB increase with the increase of peak strain. In the design, the recommended envelope value of super strong coefficient can be used to consider more reasonably the super strength characteristic of BRB. BRB is a displacement-dependent type energy dissipator. However, the unbalance coefficient of tension and compression of BRB specimens under dynamic loading at a strain rate of about 0.1 / s is obviously higher than that under static loading at the same peak strain, which indicates that the loading rate has an obvious effect on the compressive performance of BRB. This phenomenon needs further study.
【作者单位】：中国地震局工程力学研究所;中国地震局地震工程与工程振动重点实验室;
【基金】：国家自然科学基金青年科学基金项目(51308514);国家自然科学基金面上项目(51478441)
【分类号】：TU391;TU352.1

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