钢筋ECC柱复合受扭性能的试验研究和数值模拟

Experimental study and numerical simulation of composite torsional behavior of reinforced ECC columns

为了研究钢筋ECC复合受扭柱的受扭性能,以轴压比、剪跨比、扭弯比和不同基体材料为参数,完成了4个钢筋ECC柱和1个RC柱在压弯剪扭共同作用下的单调静力试验。在此基础上,用ABAQUS建立钢筋ECC复合受扭柱的有限元模型,进一步分析其受扭性能的影响规律,试验和模拟结果吻合较好。结果表明:掺入ECC试件的最低峰值扭矩比RC试件的峰值扭矩高50.48%;轴压比越高,试件的峰值扭矩越大,但延性越差;不同扭弯比试件的峰值扭矩差别不大,但扭弯比的增加会适当增加峰值扭矩和延性,弯矩对试件变形起主导作用;剪跨比越大,峰值扭矩越小,延性越好。

In order to study the torsional performance of reinforced ECC composite torsion columns,the axial compression ratio,shear span ratio,torsion ratio,and different matrix materials are used as parameters to complete the monotonic static test of 4 reinforced ECC columns and 1 RC column under compression-bending shear torsion.Based on this,a finite element model of the reinforced ECC composite torsion column is established with ABAQUS,and the influence of its torsional performance is further analyzed.The experimental and simulation results agree well.The results show that the specimen with ECCZ has the lowest peak torque 50.48%higher than the RCZ test piece;the higher the axial pressure ratio,the greater the peak torque of the test piece,but the worse the ductility;the peak torque of the test piece with different twist ratios is not much different but the increase of the twist ratio will appropriately increase the peak torque and ductility,and it is known that the bending moment plays a leading role in the deformation of the specimen;the larger the shear span ratio,the smaller the peak torque,and the better the ductility.