Table of Contents
What is a base plate?
(bās’plāt), A temporary form representing the base of a denture; used for making record of maxillomandibular (jaw) relationships and the arrangement of teeth.
What is base shear of a structure?
Base shear is an estimate of the maximum expected lateral force on the base of the structure due to seismic activity. It is calculated using the seismic zone, soil material, and building code lateral force equations (Figure 10.3). Notations in IBC/UBC are used in mathematical equations.
What is a base plate in construction?
The base plate acts as an interface between the superstructure and the foundation; thus, completing the load path into the foundation. Base plates help provide a uniform distribution of superstructure loads to the foundation, and therefore conform to the shape of the foundation, typically a square or a rectangle.
What is base plate in the construction of structural steel building?
Base plates usually are attached to the column during the fabrication of the structural steel and delivered as one piece. instances, the base plate is set using leveling screws attached to the sides of the plate (see Erection later in this article) and then grouted.
What are the types of base plates?
Types of Base Plate
- Flat Base.
- Angle Flat.
- Ribbed or spigot.
What is the material of base plate?
With their outstanding thermal conductivity, electrical conductivity and material purity, our base plates reliably dissipate heat away from the active device….Customized base plates.
| Molybdenum | Tungsten | |
|---|---|---|
| Electrical conductivity at 20 °C [1/(Ωm)] | 17.9 · 106 | 18.0 · 106 |
| Electrical resistance at 20 °C [(Ωmm2)/m] | 0.056 | 0.050 |
How is base shear calculated?
Geologists are able to calculate an “anticipated” amount of force that will be generated by a major earthquake in a specific geographical region. The base shear formula is: V = 0.2 (W) V represents the shear force that will be generated at the base of a building. W represents the weight of the building.
What is the difference between base shear and storey shear?
Base shear is an estimate of the maximum expected lateral force that will occur due to seismic ground motion at the base of a structure. Storey shear factor is the ratio of the story shear force when story collapse occurs to the story shear force when total collapse occurs.
What is the use of base plate?
A temporary oriented base plate is used for leading the drill bit and conductor to the site of well hole on the seabed. This device is welded with steel plate and rebar, and filled with concrete in the center.
What is the minimum thickness of base plate?
A minimum thickness of 12 mm is recommended for posts and lightly loaded columns, while 20 mm minimum thickness is recommended for normal applications (after Ref. 7). Preferred plate thicknesses for the base plate are: 12, 16, 20, 25, 28, 32, 36, 40. Base plates are typically cut to size using thermal processes.
How does shear transfer occur in base plates?
The tests investigated three mechanisms commonly used for shear transfer in base plates, including (1) friction between the base plate and the grouted footing, with and without steel shim stacks (2) anchor rod bearing and (3) shear key bearing. The base plate tests are complemented by ancillary tests to characterize material properties.
How is the shear force of a base plate resisted?
In most cases, the shear force can be resisted through friction between the base plate and the grout. The friction depends on the compressive load and on the coefficient of friction. Pre-stressing the anchor bolts will increase the shear force transfer by friction.
How are shear lugs attached to base plates?
To resist moderate to high column base shear loads, such as induced by seismic loading in low- to mid-rise structures, one or multiple shear lugs (also known as a shear key) may be attached to the base plate. The shear key is often provided in the form of a plate welded to the underside of the base plate.
How is shear force transmitted to the base?
Shear force will primarily be transmitted by friction between the base plate and the grout layer to the concrete foundation. If the compression force is small, or if tension force is present, as may occur in slender high rise structures like towers and masts, the friction will be small or absent.