EXPERIMENTAL PROTOCOLS

 

The Wall of Wind Experimental Facility allows NHERI users to generate new and highly specific knowledge on wind loading, wind damage, and rain intrusion mechanisms. The goal is to improve design practices and create more wind-resilient and sustainable communities. The standard experimental protocols and specifications for EF-enabled user projects outline the scope, objectives, test specimen design, scaling (length, velocity and time scales), instrumentation, wind parameters, rain parameters (if applicable), test duration, data sampling rate, and safety procedures.

Physical Measurement Test Protocol

Pertains to obtaining quantitative aerodynamic and aeroelastic data before any failure occurs. Typically, valuable information is collected at lower wind speeds, where the risk of damaging the test model and/or instrumentation is lower. The protocol describes terrain roughness, wind speed increments, test duration, range of wind directions, time intervals between runs, and other test-specific parameters. The protocol is complemented by the available Standard Operating Protocols (SOP) for each instrument measuring wind-induced effects.

Failure Mode Test Protocol

Pertains to holistic system-level testing up to failure. Wind speed is incrementally increased to the maximum possible value to study failure modes, if failure occurs. The instrumentation applicable to this type of experiment is less comprehensive and is mainly focused on vibration measurements. In most of the cases, the instrumentation should be removed when imminent failure is observed or while testing at the highest wind speeds. The protocol describes general parameters (as in Physical Measurement Test Protocol) and delineates procedures for video recording of damage initiation, progressive damage propagation, failure modes, and rainwater intrusion mechanisms.

Wind-Driven Rain Test Protocol

Describes specimen preparation and procedures for tests under wind-driven rain. Nozzle types, spacing, and arrangement are specified for achieving target rain drop size distribution and rain intensity. Moisture sensors and rain collection systems and their locations in test models to detect and measure quantity and pattern of water intrusion are also specified.