圆CFRP-钢管混凝土压弯构件滞回性能的受力全过程分析
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摘要
以试验研究为基础,应用ABAQUS有限元软件模拟了圆CFRP—钢管混凝土压弯构件的滞回性能,发现侧向荷载—中截面挠度滞回曲线和破坏模态等的模拟结果和试验结果吻合良好。给出了圆CFRP—钢管混凝土压弯构件典型的侧向荷载—中截面挠度滞回曲线。研究了混凝土的纵向应力、钢管的Von Mises应力和纵向应力以及横向CFRP和纵向CFRP的应力在受力全过程中的分布规律,发现由于外CFRP—钢管的约束,混凝土的强度得到大幅提高;混凝土、钢管和CFRP可以协同工作;横向CFRP对构件有很好的约束作用,纵向CFRP对构件有很好的增强作用。上述工作为圆CFRP—钢管混凝土压弯构件的恢复力模型的研究奠定了基础。
On the basis of experimental study,the hysteretic property of the circular concrete filled CFRP—steel tubular beam—column are simulated by using ABAQUS FE software,and it is found that the simulated results,such as the hysteretic curves of lateral load — deflection at mid—height and the failure modes,are agree well with the tested result.The typical hysteretic curve of lateral load —deflection at mid—height of the circular concrete filled CFRP —steel tubular beam—column is proposed.The distribution patterns of the longitudinal stresses in the concrete,the Von Mises stresses and the longitudinal stresses in the steel tube,as well as the stresses in the transverse CFRP and in the longitudinal CFRP during the full—range of the loading process are investigated,it is found that,the strength of the concrete increases remarkably due to the confinement effect of the outer CFRP—steel tube,the concrete,the steel tube and the CFRP could cooperate well,in addition,the transverse CFRP will provide effective confinement to the member and the longitudinal CFRP will provide effective strengthening to the member.The above studies are beneficial to the research of restoring force model of the circular concrete filled CFRP—steel tubular beam —column.
引文
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