碳纤维布加固达到承载力极限状态混凝土梁有限元分析

Finite Element Analysis of Concrete Beam Strengthened by CFRP with the Ultimate Bearing Capacity

我国建筑物基数较大,其中一些建筑物的部分构件可能已经达到了极限承载力状态,对于此类构件的加固是非常重要的。碳纤维布作为一种新型材料对混凝土梁的加固有良好的效果。为了更好地研究分析碳纤维布加固达到承载力极限状态混凝土梁的力学性能,本文利用有限元软件ANSYS对试验梁的抗弯性能进行模拟分析,在试验的基础上,建立分析模型,并通过单元生死来实现粘贴碳纤维布的过程。ANSYS分析结果与试验结果基本一致,以此确定了ANSYS软件的可行性。以该模型为基础,在混凝土梁达到承载力极限状态之后,通过改变卸载程度的大小发现,卸载越多,碳纤维布的加固效果越好。

The building base of our country is large, some building components may have reached the ultimate bearing capacity, and it is very important for the reinforcement of such components. As a new kind of material, carbon fiber cloth has a good effect on the reinforcement of concrete. In order to better study the mechannical properties of the reinforced concrete beams with the ultimate bearing capacity,the flexural behavior of concrete beam strengthened by CFRP with the ultimate bearing capacity is analyzed. The finite element model is established according to the actual situation,and through the element life and death to implement the CFRP reinforcement process. The results of ANSYS are compared with the experimental results, and the applicability and practicability of the finite element analysis are determined. on the basis of this model, after the concrete beam reached the limit state of bearing capacity, it is found that the greater the unloading degree, the better the reinforcement effect of carbon fiber cloth.