考虑材料劣化钢筋混凝土梁桥抗震性能分析

混凝土耐久性下降体现在材料性能的劣化上,而材料性能的劣化势必会导致桥梁结构抗震性能的降低.结合工程实例,以一座三跨钢筋混凝土梁桥为研究对象,利用有限元分析软件ANSYS建立全桥模型,并考虑冻融、氯离子环境因素影响,对结构进行地震荷载一致激励下的非线性时程分析.桥梁结构在整个服役期间,根据服役不同的时间段材料劣化程度的不...

Seismic performance analysis of reinforced concrete beam bridges considering material deterioration

The deterioration of concrete durability can be reflected in the degeneration of material properties, which will inevitably lead to the reduction of seismic performance of bridge structures. This paper takes 3-span reinforced concrete beam bridge as the research object to formulate ANSYS full bridge model, considering the influence of freeze-thaw and chloride ion environmental factors, then the non-linear time history analysis under uniform excitation of seismic loads is carried out. In the whole service period, the seismic response of bridge structures in different time periods is calculated according to the different degree of material deterioration in different service periods, and the stress and displacement in each period are compared and analyzed. The results show that, the seismic performance of the structure decreases significantly with the deterioration of materials, to which should be paid enough attention in the process of design and management.