Testing for solar foundation uplift resistance on site involves a combination of real-time installation monitoring and physical verification tests to ensure the foundation can withstand significant wind loads.
According to the provided guide, the following methods are used to test and verify uplift resistance:
- Torque-to-Capacity Correlation: During installation, engineers estimate uplift capacity in the field using industry guidelines from the Deep Foundations Trade Association (ADSC). This uses the formula Capacity = Kt × T, where ‘T’ is the installation torque. This provides a real-time field estimation of the ultimate capacity.
- On-Site Pull-Out Tests: This is the definitive method for verification. A controlled upward force is applied to the installed helical pier to measure its vertical load capacity. This confirms the pier meets the engineered requirements for the specific soil conditions and pier configuration.
- Lateral Load Resistance Testing: Because solar arrays are subjected to horizontal wind and seismic forces, lateral testing is conducted alongside uplift testing to ensure the foundation remains stable under multi-directional loads.
- Proprietary Modeling Software: Tools like HeliCAP® are used to model configurations and calculate expected capacities and installation torque based on site-specific soil data before and during the testing phase.
Ultimate capacity must always be validated through these on-site tests and professional engineering analysis to ensure compliance with ICC-ES AC358 acceptance criteria.
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