Analysis Of Shear Failure Of Reinforced Concrete Piers Under Static Ice Pressure At ICE-Water Interface

This paper examines the mechanism of shear failure of piers 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 Trestle Bridge across the Ulan Moron River at No.3 Dam in Erdos City,Inner Mongolia as a case,the numeric analysis of static ice pressure on the piers at ice-water interface was made through modeling of forced piers and using of finite element software ANSYS.The temperature variation and freezing thawing cycles causes many problems,which is harmful to the hydraulic structure more significant in northern area of our country.Both floating ice pressure or static ice pressure will have an adverse impact on the piers in the water,which leads to the piers vibration,the stiffness,the stability and threats safety operation of upper structure.Firstly,this paper states the research status of static ice pressure and its effect on bridge piers at home and abroad and points out the research methods and technical route.Secondly,it analysis the principle of the static ice pressure from the ice microstructure, produce and fadeaway of static ice pressure, strength and mechanical properties of ice.On this basis,this paper chooses the typical bridge span then calculates vertical loads of superstructure generated by MIDAS CIVIL calculation and analysis principal stresses of the connections of pier column-pile cap,pier column-bent cap under the combination action of loads from the superstructures and the static ice pressure by ANSYS so as to judging the security of the structure.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,pier column-bent cap,the expansion of ice cover would produce the static ice pressure due to the ricing of its temperature.The results of modeling analysis are basically consistent with the measured ones on-site test.It has practical significance through puts forward to the static ice pressure measures at the same time, provides technical support for the prevention of the occurrence of such incidents.