【摘要】 Y型偏心支撑钢框架是偏心支撑结构中抗震耗能的结构形式之一,为了研究Y型偏心支撑钢框架中耗能梁段腹板高厚比对结构滞回性能的影响,进行了2榀1/3缩尺Y型偏心支撑钢框架的低周反复荷载试验。本文主要介绍了试验过程,分析了Y型偏心支撑钢框架在循环荷载作用下的破坏机理、滞回性能、延性、刚度退化规律以及耗能能力。试验结果表明:Y型偏心支撑钢框架延性好、耗能能力强,耗能梁段腹板高厚比的改变对Y型偏心支撑钢框架强度、刚度以及耗能能力具有较大的影响。耗能梁段腹板高厚比设计得合理,Y型偏心支撑钢框架侧向刚度较大,可以满足在小震或中震作用下的结构变形要求,在大震作用下提供良好的变形能力和耗散地震能量的功能。更多还原

【Abstract】 Y-shaped eccentrically braced steel frames have high earthquakes resistance and energy-dissipation.In order to research the energy-dissipation of Y-shaped eccentrically braced steel frames in changing depth-thickness ratio of link beam,the one-bay two-story test specimen at one-third scale was made under low reversed cyclic loading.The process of test was introduced and failure mechanism,hysteretic behavior,ductility,rigidity degeneration and energy-dissipation of Y-shaped eccentrically braced steel frames were analyzed.Experimental studies show that Y-shaped eccentrically braced steel frames can provide well ductility and have remarkable energy-dissipation capacity and changing depth-thickness ratio of link beam has effect on strength,stiffness and energy-dissipation capacity of Y-shaped eccentrically braced steel frames.If depth-thickness ratio of link beam was designed reasonably,the Y-shaped eccentrically braced steel frames can not only provide certain stiffness under the moderate level of earthquake but also develop remarkable ability of deformation and energy dissipation under the rare level of earthquake.更多还原