GGU-VIBRATION: Driving ram (diesel hammer)
For a driving ram (diesel hammer) the following "Edit/Systemparameters" dialog box opens:
The input corresponds to the input for vibrating pile drivers.
The predominant soil type is entered for "Soil". Three soil types are differentiated:
Cohesive soils
Gravels, sands
Stones.
This input is important for analysis of the resulting ground vibration acceleration aGround,R according to Equation 9.1 and Table 9.2 in Bulletin 61. The building settlement hazard can be assessed using the resulting ground vibration acceleration aGround,R. The allowable value, including for soils susceptible to collapse, is:
aGround,R 1/3 · g = 3,300 mm/s² = 3.3 m/s²
The program issues a warning message if the allowable values are exceeded.
For computation of the resulting ground vibration acceleration aGround,R "soft or loose ground" and "very firm or dense ground" are differentiated according to Table 9.2. This setting is made in "Ground is".
In the "Equipment" group box in place of power and frequency, however, the energy per stroke [kN·m] and vibration frequency [Hz] or [1/s] are entered. Vibration frequency input is only required for determining the allowable values according to Table 7.1 in Bulletin 61. Resonant frequencies are not anticipated for impact driving.
Here, too, the equipment data can be selected and adopted from a list of common commercial appliances using the button of the same name. Equipment selection and editing of the equipment list are described separately in Section “Selecting and managing equipment”.