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StatRapid Load Testing (STR)

Brochure - StatRapid, A new Rapid Load Testing Application (2970 downloads)


In response to market demand for Rapid Load Testing the company Cape-Holland ( has manufactured Rapid Load Testing devices (the so-called StatRapid) based on dropping a mass on a soft cushioning system. StatRapid systems are indicated by the maximum rapid load they can achieve. For example, a StatRapid 8MN device can achieve rapid loads ranging from 0.2MN to 8 MN. Higher and lower capacity devices are available.


A StatRapid 8MN system consists of a lifting and guidance frame, a modular drop mass (allowing for a mass up to 40 tonnes), a catch mechanism and a modular soft spring system. The size and duration of the load can be adjusted by varying the drop mass weight, the spring stiffness and the lifting height. The system is hydraulically operated and has sensors for a proper vertical and stable position. It should be noted that the dead weight of the drop mass can also be used for the first (static) loading cycle.


The catch mechanism catches the drop mass after bouncing up from the springs. This prevents unwanted rebounds and allows for successive cyclic testing  with increasing loads similar to static load cycling testing.  In accordance with the CUR and ASTM standards the load, displacement and acceleration are measured near the pile top and then recorded. The load is measured with one or more load cells, the displacement with an optical system (Reyca) and the acceleration with a servo accelerometer.


The required load duration for Rapid Load Testing depends on the pile length. The modular set up allows for the tuning of the StatRapid system for piles with different lengths before going to site, which can be checked with the Allnamics-RLT simulation program.

The PDR, Allnamics' testing monitoring system, and the associated monitoring and analysis Allnamics-RLT software allow the reporting of the  Rapid Load Test results according the ASTM D7383-10 standard and CUR 230 Guideline.