【摘要】 试验设计了2个几何尺寸相同的全钢屈曲约束支撑(BRB)试件,其中1个试件在核心板和约束部件之间采用无黏结材料,另1个试件未采用无黏结材料。通过低周往复加载试验,分析了无黏结材料对全钢BRB滞回性能、失效模式、受压承载力调整系数和残余变形等的影响。结果表明:采用和未采用无黏结材料的全钢BRB均表现较好的低周疲劳性能,但采用无黏结材料后,全钢BRB在等幅加载中的循环次数增加了21%,低周疲劳性能略有提高;未采用无黏结材料的全钢BRB的受压承载力调整系数远大于采用无黏结材料的全钢BRB;无黏结材料减小了全钢BRB核心板和约束板之间的摩擦力,避免核心板磨损;核心板和约束板间的摩擦力导致核心板屈服段中部收缩、两端膨胀,未采用无黏结材料的全钢BRB残余变形更为显著,且核心板端部膨胀会挤压填充板条。更多还原

【Abstract】 Two all-steel BRB specimens with identical dimensions were designed in the experiment and only one specimen employed the unbonding material between the core plate and the restraining members.Static cyclic loading tests of the two specimens were performed in order to evaluate the effect of the unbonding material on the all-steel BRB’ s performance,including the failure mode,hysteretic behavior,compression strength adjustment factor and residual deformation.It is concluded from test results that two BRB specimens have good low-cycle fatigue performance.Moreover,the number of cycle of the BRB with the unbonding material under the constant loading amplitude increases by 21%,which shows that its low-cycle fatigue performance is better than the BRB without the unbonding material.The compression strength adjustment factor of the BRB without the unbonding material is much greater than one with the unbonding material.The unbonding material can decrease the frictional force between the core plate and the restraining members and can prevent the core plate from wear.The frictional shear force causes the middle region of the yield segment to shrink and the end region to expand.This observation is very clear for the BRB without the unbonding material and its expanded core plate squeezes the fillers.更多还原