Weaknesses of Truss Retaining Structures
Although truss retaining systems offer several benefits in excavation support, they also suffer from serious structural and operational weaknesses. The most common challenges associated with the use of truss systems in retaining structures include:
1. Lack of Field-Based Engineering Design
Structural engineers often treat truss systems as standardized designs, leading to limited site-specific inspections and a lack of customized engineering solutions tailored to the actual needs of the project.
2. Misconceptions by Clients and Developers
Most clients and project owners tend to view truss systems as purely cost-driven, sometimes even seeing them as non-essential structures. This perspective often stems from a lack of awareness regarding regulations, responsibilities, and legal consequences in the event of structural failures.
3. Poor Execution by Unqualified Contractors
Contractors responsible for building these systems often show little interest in adhering to technical drawings or specifications. Due to the apparent simplicity of truss designs and construction methods, non-professionals are frequently assigned to perform critical tasks, increasing the risk of failure.
4. Passive Role of Supervising Engineers
Because of the accumulation of these issues, site supervisors may also feel disempowered or ineffective in addressing design and construction problems. As a result, they often become complicit in accepting project risks, rather than actively working to resolve them.
Source: General Supervision Guide for Engineers (Iran)
