方钢管再生混凝土压弯短柱受力性能试验研究

Experimental research on mechanical behavior of recycled aggregate concrete filled square steel short tube under eccentric compression load

研究方钢管再生混凝土压弯短柱的力学性能,在考虑再生骨料取代率和偏心率2个因素的基础上,对15个试件进行了一次单调加载试验。通过试验获得试件的破坏形态、破坏荷载、荷载-变形曲线以及荷载-应变曲线,分析了2种因素对构件力学性能的影响。结果表明:方钢管再生混凝土与方钢管混凝土的承载力、破坏形态、变形特征、截面应变分布相似;钢管再生混凝土的承载力随再生骨料取代率增大略微降低,随偏心距增大明显降低。

To study the mechanical performance of recycled aggregate concrete filled square steel short tube under eccentric compression load, 15 specimens were designed and used in the monotonic loading test. Two factors were considered which were recycled aggregate replace- ment ratio and eccentricity. In the test, the ultimate bearing capacity, load-displacement curves and load-strain curves of the specimens were recorded, while the failure patterns and failure process were also observed. Thus the impact of the two factors on the mechanical prop- erties of specimens were analyzed. The results indicate that the ultimate bearing capacity, fail- ure patterns, deformation features and Sectional strain distribution of recycled aggregate con- crete filled square steel tube and concrete filled square steel tube were consistent. The bearing capacity decreased with the increasing of recycled aggregate replacement ratio and eccentricity, while recycled aggregate replacement ratio had a little effect on the bearing capacity.