基于ANSYS对冻融冰水界面静冰压力作用下钢筋混凝土桥墩破坏的分析

Analysis of Shear Failure of Reinforced Concrete Piers under Static Ice Pressure at Ice-water Interface Based on ANSYS

以内蒙古鄂尔多斯市乌兰木伦河3号坝钢筋混凝土桥为例,通过建立冻融冰水界面桥墩受力模型,并运用有限元分析软件ANSYS数值分析静冰压力对桥墩的剪切作用.计算结果表明,冰盖受温度升高膨胀而产生静冰压力,在墩柱-承台连接处、墩柱-盖梁连接处形成应力集中,在上部荷载和静冰压力组合作用下导致桥墩斜向剪切破坏,建模分析结果与现场检测结果基本一致.

The mechanism of shear failure of piers is examined under the static ice pressure at ice-water interface around the piers in the cold area, which was cased by the ice cover body due to the alternation of freezing and thawing. Taking the RC voided slab Bridge across the Ulan Moron River at No. 3 Dam in Erdos City,Inner Mongolia as a case, the numeric analysis of static ice pres- sure on the piers at iceater interface was made through modeling of forced piers and using the finite element software ANSYS. The results have shown that the oblique shear failure occurred under the combination action of loads from the superstructures and the static ice pressure,which caused the stress concentration at the connections of pier column-pile cap and pier column-bent cap,the expansion of ice cover would produce the static ice pressure due to the rising of its temperature. The results of modeling analysis are basically consistent with the measured ones on-site test.