Dear reader we were discussing about live loads for foundation settlement analysis. Live load includes weight of members that are considered non-structural component of structure like
Live load can also result foundation settlement. Say if propose structures or part of the proposed structure is used as library, the live load or additional live load is weight of books-this weight may have contribution to settlement of foundation.
Similarly if the proposed structure is used as warehouse, the analysis and design of structure must include true weight of expected items that will be stored there. So they contribute to settlement of foundation.
In some projects live loads become a considerable part of total load, like large towers for electric transmission or other tower for radio signal processing. In this structures, wind loads draw significant attention from engineering, here live load (as wind) have to consider in settlement analysis.
As a whole, in settlement analysis should consider actual weight (dead) of structure and in appropriate cases including live loads. Here also considerable judgment and experience are required for determining loads for such analysis.
b. Settlement caused by secondary influences:
This cause includes
- Failure of collapsible soil underground infiltration
- Yielding of excavation done adjacent to foundation
- Failure of underground tunnels and mines
- Collapse of cavities of limestones
- Undermining of foundation while flood
- Earthquake induced settlement
- Due to extraction of ground water and oil.