Selection Of Bearing Structure Form
The selection of bearing structure form is one of the primary considerations when designing any building. It is important to understand the possible options available and the advantages and disadvantages of each, in order to make an informed decision. Within the selection process, there are a number of considerations that should be taken into account, including site conditions, type of loading, soil conditions, and type of subgrade.
Site Conditions
The site conditions need to be more closely surveyed in order to determine the available soffit level and the distance to the bottom of the foundation. A thorough geotechnical investigation, as well as a review of the local building codes, should be conducted as part of the site investigation. The topography will play an important role in the type of bearing system selected, as well as the impact that the building site might have on the structural system. The available subgrade should also be considered, as some systems may be more suitable for certain soils.
Loading Conditions
The type of loading should be determined in order to calculate the stresses that will be imposed on the bearing system. An analysis of the vertical and lateral loads will provide an indication as to what type of load should be considered, as well as the magnitude of the load. Structural analysis software can be used in order to accurately calculate the forces, which will have an effect on the final selection.
Soil Conditions
The soil conditions should be taken into consideration when selecting a bearing system, particularly in regards to how the system will interact with the subgrade. If a significant amount of upheaval or settlement is expected, the use of a compressed bearing system may be necessary in order to limit the movements of the structure. Concentrated and distributed loads should be factored in to the analysis, in order to make sure that the bearing system can resist these forces. If the soil conditions are poor, then a piled foundation may be the better option.
Subgrade Type
The type of subgrade should also be taken into consideration when selecting a bearing system. Different subgrade types provide different levels of support and flexibility, and will often require a different type of bearing system to take advantage of their characteristics. For example, a rigid subgrade such as concrete rig can provide greater support than a more pervious subgrade, such as soil. The type of bearing system chosen should be compatible with the subgrade type in order for the structure to be properly supported.
In conclusion, the selection of a bearing structure form is an important consideration when designing any building. The different types of bearing systems available, as well as the benefits and drawbacks of each, need to be carefully considered in order to make an informed decision. The site conditions, type of loading, soil conditions, and type of subgrade should all be investigated in detail prior to making a selection. By taking all of these factors into account, the most appropriate bearing system can be selected.
