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中文摘要：
为了研究圆钢管再生混凝土在偏心荷载作用下的性能退化规律,以再生粗骨料取代率、长细比和偏心距为变化参数,设计了15个试件进行静力单调加载试验,在此基础上分析了其变形延性、耗能能力和刚度退化的演化过程。研究结果表明：圆钢管再生混凝土试件的耗能能力随再生粗骨料取代率的增加而提高,再生混凝土试件的延性比普通混凝土试件的大;长细比在31.3至38.26时,试件的耗能能力增长较快,而长细比过大则降低其耗能能力;试件的变形延性随长细比的增长而增大,而其弹性刚度随长细比的增大而呈线性衰减;偏心受压试件的耗能能力总体上大于轴心受压试件,随着偏心距的增大,试件的延性系数呈稳步增长的趋势;所建议的刚度退化计算模型可为圆钢管再生混凝土受压构件的工程设计提供必要的参考。
英文摘要：
In order to study the performance degradation of recycled aggregate concrete filled circular steel tube under eccentric com-pression loading,15 specimens with different replacement ratio of recycled coarse aggregate,slenderness ratio and eccentricity were test-ed under the monotonic static loading. On this basis,the evolutionary process of ductility,energy dissipation and rigidity degeneration were analyzed. The results show that the energy dissipation of recycled aggregate concrete filled circular steel tube specimens can be en-hanced with the increasing of recycled coarse aggregate replacement ratio,and the ductility of recycled coarse aggregate specimens is larger than that of normal concrete specimens.When the slenderness ratio is between 31.3 and 38.26,the energy dissipation of specimens is enlarged faster,while it can be decreased when the slenderness ratio is too large. An increase of slenderness ratio lead to an increase of the deformation ductility but a decrease of elastic stiffness. The total energy dissipation of specimens under eccentric compression is lar-ger that that of specimens under axial compression. With the increase of eccentric distance,the ductility factor of specimens can be in-creased steady. The model of rigidity degeneration can be served as a conference in engineering calculation for design the recycled ag-gregate concrete filled circular steel tube members.
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