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More often than not, there are unused margins between the limits defined by static ratings and the "true limits" measured by a DLR or real-time thermal rating (RTTR) system. Several methods have been developed since the 1990s, most of which rely upon sensors deployed on overhead lines to measure parameters in real-time.
These load factors are, roughly, a ratio of the theoretical design strength to the maximum load expected in service. They are developed to help achieve the desired level of reliability of a structure [6] based on probabilistic studies that take into account the load's originating cause, recurrence, distribution, and static or dynamic nature. [7]
The dynamic loads have some relationship with expected field loads.: [3] often factors of 4 or 5 are used to estimate the allowable working load on boxes. A test can also be conducted with platens that are not mechanically driven but are free to move with a fixed mass (or fixed force) loaded upon them. [4] The results of static load testing can be:
A dynamic load is one which changes with time fairly quickly in comparison to the structure's natural frequency. If it changes slowly, the structure's response may be determined with static analysis, but if it varies quickly (relative to the structure's ability to respond), the response must be determined with a dynamic analysis.
Kentledge load testing in Haikou, Hainan, China. Static load testing is an in situ type of load testing used in geotechnical investigation to determine the bearing capacity of deep foundations prior to the construction of a building. It differs from the statnamic load test and dynamic load testing in that the pressure applied to the pile is slower.
Mechanical load is the physical stress on a mechanical system or component [1] leading to strain. Loads can be static or dynamic. Some loads are specified as part of the design criteria of a mechanical system. Depending on the usage, some mechanical loads can be measured by an appropriate test method in a laboratory or in the field.
Dynamic load testing (or dynamic loading) is a method to assess a pile's bearing capacity by applying a dynamic load to the pile head (a falling mass) while recording acceleration and strain on the pile head. Dynamic load testing is a high strain dynamic test which can be applied after pile installation for concrete piles. For steel or timber ...
The dynamic component is computed as the product of the pile velocity times the damping factor (a soil parameter related to soil grain size). The static component is the total soil resistance minus the dynamic component). Dynamic load testing takes a further step in analyzing the data and computing static capacity and resistance distribution.