Assessing Earthquake Resistance of HRB400 Reinforced Concrete Frames Through Data Detection Techniques

In national building standards, HRB335 steel bars have been phased out, with HRB400 and higher-grade steel becoming standard for structural materials. The use of HRB400 reinforced concrete (RC) frame structures has grown, as earthquake-related casualties and economic losses are often caused by building collapse. This study evaluates the seismic performance of RC frame structures reinforced with HRB400 material, focusing on four key parameters: axial compression ratio, aspect ratio, concrete strength, and longitudinal reinforcement strength. Using a data detection method, the seismic vulnerability of these structures is assessed. Aftershock analysis reveals that with 160 aftershocks, the probability of slight damage is 0.92, moderate damage is 0.59, and serious damage is 0.29. This suggests that repeated aftershocks elevate the vulnerability curve, increasing the likelihood of structural damage. Thus, the inspection and evaluation of HRB400-reinforced structures is crucial for ensuring building safety in seismic regions.