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屈曲约束支撑(BRB)是一种有效的抗震耗能构件,具有拉压性能相当、滞回曲线饱满稳定、耗能性能优异等优点。通过大量TJ型屈曲约束支撑疲劳试验,分别从等幅疲劳和变幅疲劳两个方面评估其低周疲劳性能。等幅荷载作用下,BRB构件的疲劳寿命与应变幅满足Manson-Coffin公式。根据国产屈曲约束支撑的性能,引入结构可靠度理论,得到了具有不同保证率的容许疲劳寿命曲线。在变幅荷载作用下,利用帕尔姆格伦-迈纳线性累积损伤理论对屈曲约束支撑构件的损伤进行统计,提出具有95%保证率的容许损伤因子。利用雨流计数法,统计了罕遇地震下屈曲约束支撑构件的封闭环,并提出一套随机地震荷载下累积损伤的经验评估流程,为屈曲约束支撑的工程应用提供了方法与思路。最后,通过引用文献数据作为盲测样本,表明研究结果能在保证准确率的前提下较为保守地预测等幅和变幅加载下的屈曲约束支撑疲劳破坏。
Buckling restrained brace (BRB) is a kind of effective earthquake energy dissipation member, which has the advantages of equivalent tension and compression, full and stable hysteresis curve and excellent energy dissipation. Through a large number of TJ-type buckling restrained support fatigue test, respectively, from the amplitude amplitude fatigue fatigue and fatigue assessment of its low-cycle fatigue performance. Equal amplitude load, the fatigue life and strain amplitude of BRB member satisfy the Manson-Coffin formula. According to the performance of domestic buckling restraint brace, the structure reliability theory is introduced, and the allowable fatigue life curves with different guaranteed rates are obtained. Under the action of luffing load, the damage of buckling restrained support members is calculated by the Palmer Glenn-Män theory of linear cumulative damage, and the allowable damage factor with a 95% guaranteed rate is proposed. Using rain flow counting method, the closed loop of buckling restrained support members under rare earthquakes was calculated, and a set of empirical evaluation procedure of cumulative damage under random earthquake loads was provided, which provided a method and idea for engineering application of buckling restrained brace. Finally, by citing the literature data as a blind test sample, it is shown that the results of the study can more conservatively predict the fatigue failure under buckling load with amplitude and amplitude loading under the premise of ensuring the accuracy.