Process–Cost Integrated Management and Data Utilization Based on OpenBIM

Construction projects generate large volumes of schedule and cost data throughout their lifecycle, requiring systematic integration for effective performance control. Despite the increasing adoption of BIM and Earned Value Management System (EVMS), existing studies have not sufficiently validated an interoperable IFC-centered framework that systematically links Work Breakdown Structure (WBS), cost data, and performance indicators within a single openBIM environment. To address these issues, a BIM-based EVM application system was developed using the Industry Foundation Classes (IFC) standard for efficient process–cost integrated management. Therefore, this study develops and validates an IFC-based openBIM Earned Value Management System (EVMS) to enable structured schedule–cost integration and performance monitoring within a unified data model. In this study, domestic and international methods of process–cost integrated management and current EVMS applications were investigated, and a BIM-based EVMS analysis process was established. The proposed system was then applied to two reinforced concrete construction project case studies to analyze EVMS results. The proposed framework integrates classification-based IFC object data, quantity extraction, and rule-based schedule–cost linkage to generate BCWS, BCWP, and ACWP indicators for performance evaluation. The system was implemented and empirically validated through a reinforced concrete construction project case study. Validation demonstrated the system’s ability to identify a significant cost overrun of 23,090,381 KRW and project a final budget excess of 92,447,283 KRW, demonstrating the practical feasibility of IFC-centered process–cost integration and its capability to provide early warning signals for schedule and cost deviations. The findings provide empirical evidence that an openBIM-based single-model structure can enhance interoperability, reduce manual reconciliation between WBS and cost breakdown structures, and support data-consistent EVMS analysis in heterogeneous software environments.