ISO 22477-10:2016 pdf free

ISO 22477-10:2016 pdf free.Geotechnical investigation and testing一Testing of geotechnical structures
The load applied to the pile shall be determined directly by a purpose built calibrated load cell which does not form part of the pile. The use of pile mounted strain gauges to derive externally applied loads for steel or precast concrete piles shall only be considered in special circumstances where a load cell is unavailable and the stiffness of the pile material is known from manufacturer’s certification or has been verified directly through material element testing for the piles under test. For cast insitu concrete piles, a purpose built calibrated load cell should be used or where pile mounted strain gauges to derive externally applied loads are used, these should be calibrated against load cell readings for the specific piles under test.
Surface mounted strain gauges should be mounted in diametrically opposed pairs. Where embedded strain gauges are used to compliment test results or where the criteria exceeds in Formula (1), strain gauges or strain gauge devices should be fixed to the reinforcement bars or embedded in the concrete of concrete piles or attached to the walls of steel piles at least in diametrically opposed pairs at each depth to be considered. Where strain gauge devices are cast in concrete, it is advised that a minimum of three devices should be used at each depth to be considered. To determine load from strain, the cross section and the pile material modulus of elasticity shall be assessed. All the materials present in the pile shall be considered in this determination.
NOTE 1 Strain-transducers based upon vibrating wire technology are generally not suitable for rapid load test monitoring and strain gauge based instruments are preferred.
All loading and settlement (as a result of loading larger than 1 % of the expected static bearing capacity of the pile) after installation of the pile shall be measured. This includes all types of static preloading of the pile. In addition, any additional equipment or component parts of the loading system connected to or in contact with the pile during the application of load that can to contribute the inertial resistance of the pile shall be of known mass. The mass of this additional equipment or component parts must be recorded as part of the pile testing results.ISO 22477-10 pdf free.