Abstract: The complex corrosive environment created by dust, moisture, chemical substances, and corrosive media (e. g. ,sulfides) released during mining excavation poses significant adverse effects on building structures near mining projects. To quantify the impact of material corrosion and near-fault ground motion on the seismic performance of reinforced concrete (RC) structures,this study investigates a six-story RC frame structure situated in a corrosive environment. The seismic performance of the structure under the combined effects of earthquake loading and environmental corrosion is explored. Based on numerical simulations and probabilistic analysis,five corrosion scenarios (0%,5%,10%,15%,and 20%) are introduced for seismic fragility assessment. Inter-story drift ratio is selected as the structural damage index to quantify the performance degradation mechanism under different levels of corrosion and seismic intensities. The results indicate that near-fault earthquakes result in higher structural failure probabilities compared to far-field earthquakes. Additionally,higher corrosion rates significantly increase the failure probability under the same peak ground acceleration (PGA). While far-field earthquakes exhibit more pronounced cumulative damage effects,the influence of corrosion on fragility shows relatively minor differences between nearfault and far-field conditions. The mining environment has multifaceted impacts on the fragility of building structures,with chemical corrosion playing a particularly prominent role. Therefore,the effects of corrosive environments should be fully considered in structural design and management to ensure the safety and durability of building structures. 

Key words: seismic vulnerability,RC frame structure,near-fault ground motion,material corrosion,numerical simulation, mine environment