Design of a BIM-based Dynamic Monitoring and Audit Traceability System for Engineering Costs

Abstract

Dynamic monitoring and audit traceability of engineering costs require integrated processing of BIM components, cost data, contract information, and construction progress. Traditional cost-management workflows based on manual quantity take-off and scattered documents have limited ability to support real-time control and complete audit paths. This study proposes a BIM-based dynamic monitoring and audit traceability system for engineering costs. A component-level mapping mechanism integrates bills of quantities, contract information, construction progress records, and cost items into a unified data structure. Based on BIM parametric modeling, quantities are automatically extracted, dynamic cost models are updated through timestamps and version control, and cost deviations are identified through planned-value, actual-cost, and deviation-value comparison. A schedule-cost coupling model is further introduced to detect abnormal cost changes caused by progress delays or rushed work. For traceability, a data-log and version-tracking mechanism records cost data generation, modification, and confirmation, while multi-source association auditing links components, business events, and cost results. Experiments show that cost-calculation time decreases from 128.5 s to 42.7 s, deviation identification increases to 92.8%, and audit-path completeness reaches 95.6%. The system supports BIM-based data integration, engineering monitoring, and traceable decision support.