The assessment of the risk of damage in structures, generated by vibrations, is implemented according to the type of vibrations. In this perspective the vibrations are divided into two types:
- Continuous vibrations;
- Impulsive vibrations.
When the vibrations are of the impulsive type, in Portugal, the evaluation is performed according to the Portuguese Standard NP2074: 2015 – Evaluation of the influence of impulsive vibrations in structures. However there are situations where this standart has no application, by the type of vibration in question do not beeing impulsive. For continuous vibration, not impulsive , as it occurs with some frequency, There is no Portuguese standard applicable, nor European, or ISO. In these circumstances, the dBwave carries out the measures in accordance with German standards, that are a reference in Europe. In this case the standard DIN 4150-3 Structural vibration – Part 3: Effects of vibrations in structures.
The measurement procedures are different in the two standards because, in the case of continuous vibrations, they can come into play resonance phenomena, Thus the measures must to be carried out where the structure vibrates more.
The evaluation criterion is the following:
|Line||Type of structures||Guide values Vi , in mm/sec peak|
|Buildings used for commercial purposes, industrial or similar project|
|Homes and buildings of similar design and/or occupation|
|Structures that due to your particular sensitivity to vibrations, cannot be classified as none of the above and are of great intrinsic value (ex..: historic buildings)|
We carry out measurement and exposure assessment of structures to continuous vibration according to DIN 4150-3.