Analysis Of Seismic Performance Concorroded Reinforced Concrete Frame Structure

In recent years, earthquake disasters in worldwide are increasingly frequent. Public arepaying more and more attention to it especially after the Wenchuan Earthquake whichhappened in our country. Many earthquake disasters happened both at home and abroad showthat earthquake destructions were more likely to happen during the earthquake due to theexisting building structures which were built at various times and places would havedurability damage which would reduce the seismic performance of the structures. The articledoes research on corroded reinforced concrete frame structure and construct the3-D finiteframework element model, frame eismic performance under different corrosion rate isanalyzed. Main research work as follows:1)Do modal analysis on the frame structure when the rust and corrosion rate ofreinforcement is respectively0,10%,20%,30%and comparative analysis towards the naturalvibration period of the structure. The results showed that the action of rust has a significantinfluence to the cycle of the structure, and increasing along with the increasing of corrosionrate. When the value is10%,20%,30%, the cycle of the structure increases respectively by3.5%,6.5%,10.9%. The concrete degradation changes significantly to the cycle among them.2) Applying seismic waves which peak acceleration isrespectively0.05g,0.15g,0.25g,0.35g. Do dynamic time history analysis on the frame structure when the rust and corrosionrate of reinforcement is respectively0,10%,20%,30%. The results showed that under thesame seismic response, the top displacement, velocity and acceleration of the frame structureall have different degree of delay along with the deepening of reinforcement corrosion.3)Do comparative analysis on the lateral displacement and the displacement betweenevery two adjacent floors of the corrosion framework, the results showed that he ability ofhorizontal resist lateral displacement declines significantly along with the increasing ofreinforcement corrosion. when earthquake action is small, the horizontal displacementamplification of corroded frame structure is slightly larger than noncorroded frame structure.With the earthquake intensity increasing and corrosion degree deepening, lateral and relativestorey displacement accelerated increasing. Especially when the value is30%, the topdisplacement increased by nearly70%, the capability of the structure to stand the earthquakedeclined sharply.4) By applying stress to the structure after the earthquake analysis, we found in negativemoment area of beam end the first to break, and the lower the extent of damage in the uppercolumn; tensile failure occurs mainly at the bottom and nodes, the underlying columnmaximum force, as the weak link; with the increase in corrosion rate, peak acceleration of seismic waves increases, the underlying frame structure appeared failure situation in the framecolumn.