方钢管再生混凝土短柱轴压力学性能有限元分析

Finite Element Analysis for the Mechanical Behavior of Short Columns of Recycled Concrete-filled Square-steel Tubes under Axial Compression

为进一步探讨方钢管再生混凝土轴压短柱的力学性能,在试验研究的基础上,采用非线性有限元软件ABAQUS对试验短柱的荷载-位移曲线进行了数值模拟,验证了有限元分析模型的正确性。将钢材强度、再生骨料取代率和钢管壁厚度作为变化参数,用该模型对方钢管再生混凝土短柱轴压力学性能进行了非线性分析。研究表明,钢材强度对试件荷载-位移曲线幅值与形状均有影响,提高钢材强度会增大试件极限承载力,而曲线下降段更平缓;再生骨料取代率主要影响试件极限承载力,随着再生骨料取代率的增大,极限承载力略有减小;钢管壁厚度对试件荷载-位移曲线的影响较大,随着钢管壁厚度的增大,试件极限承载力和加载初期刚度均有所增大,但试件延性变化不大。

In order to further probe into the mechanical behavior of short columns of recycled concrete-filled square steel tubes under axial compression,the load-displacement curves of tested short columns are simulated by the nonlinear finite element soft ABAQUS on the basis of experiments and the correctness of the finite element analysis model is verified.The influences of the steel strength,recycled coarse aggregate replacement percentage and thickness of steel tube on the mechanical behavior of short columns of recycled concrete-filled square steel tubes under axial compression are analyzed through the calculation model.It is indicated that the steel strength has an effect on the value and shape of the load-displacement curves.With the increasing of steel strength,the ultimate bearing capacity of specimen is improved,but in the descent section of curves it is gentle.The recycled coarse aggregate replacement percentage impactes the ultimate bearing capacity of specimen primarily.when it increases,the ultimate bearing capacity of specimen decreases slightly.The thickness of steel tube has a great influence on the load-displacement curves of the specimen.As the thickness of steel tube increases,the bearing capacity of axial compression and the initial stiffness would be raised,but ductility of the specimen has a less change.