L形方钢管再生混凝土组合异形柱轴压力学性能研究

Axial Compression Behaviour of L-Shaped Column Composed of Recycled Aggregate Concrete-Filled Square Steel Tubes

为研究L形方钢管再生混凝土组合异形柱的轴压力学性能,在试验基础上,对L形方钢管再生混凝土组合异形柱进行了数值模拟,通过与试验结果对比,验证了模拟结果的准确性。分析表明,当再生粗骨料取代率超过40%时,异形柱的弹塑性阶段不明显,有直接进入塑性阶段的趋势。考虑钢材强度、钢材厚度、方钢管宽度和连接板宽度等因素,对L形方钢管再生混凝土组合异形柱进行了参数化分析。参数化分析结果表明:随着钢管内再生混凝土粗骨料取代率的提高,异形柱的峰值承载力减小,刚度降低,延性降低;相同粗骨料取代率下,随着钢材强度提高、钢材厚度的提高和方钢管宽度的增加,异形柱的峰值承载力逐渐增大;而连接板宽度对试件的峰值承载力影响不大。

To study the axial compressive behaviour of the L-shaped column composed of recycled aggregate concrete-filled square steel tubes(L-RACFST),the numerical studies on the L-RACFST columns and verified the numerical model were performed based on the test result.The finite element analysis results showed that when the replacement ratio of recycled aggregate coarse(RAC)exceeded 40%,the elastic-plastic stage was not obvious,and the curve tended to directly enter the plastic stage.Parametric study was performed considering the effect of steel strength,the steel tube thickness,the width of square steel tube and the connecting plate,etc.With the increase in the replacement ratio of RAC,the bearing capacity,stiffness and ductility of the L-RACFST columns decreased.With the same replacement ratio of RAC,the peak bearing capacity of the L-RACFST columns increased gradually with the increase of steel strength,steel tube thickness and square steel tube width.The width of the connecting plate had little effect on the peak bearing capacity of the specimen.The research results of this paper can provide a theoretical basis for the engineering design of the L-RACFST columns.