Seismic risk assessment method for frame structures considering steel corrosion
In order to scientifically evaluate the seismic risk of steel corrosion in frame structures,the effects of steel corrosion and concrete cracking on the anti-collapse performance of frame structures were studied.The mean deformation capacity of the structure corresponding to the collapse limit state was defined as a function of time,and the annual failure probability of the structure collapse was integrated by considering the aging time.The seismic collapse probability of the structure considering the corrosion effect of steel bars was obtained.A seismic risk assessment method considering the aging effect of structures was proposed,and this method was applied to corroded RC frame structures with different seismic intensities.The impact of structural aging effects on seismic risk near the collapse limit state was studied.The results show that the collapse margin ratio(CMR)of a frame structure with 6,7,8-degree seismic intensities that has been corroded for 50 years is 18.7％,31.0％,and 19.4％lower than that of a non corroded structure,respectively.The mean annual collapse rate of a frame structure with 6,7,8-degree seismic intensities considering aging effects for 50 years is 28.6％,59.8％,and 32.6％higher than that of a structure without considering aging effects,respectively.It is recommended to consider the influence of structural aging effects in the seismic risk assessment of RC frame structures in different intensity zones.
万方数据
维普
