58

*Up to V2 in, use splice plates.

*Up to V2 in, use splice plates.

FIGURE 5.32 Column splice with complete-penetration groove welds to resist bending moments.

When fasteners are used for a column splice, it is good practice to space the holes so that the shafts are pulled into bearing during erection. If this is not done, it is possible for fasteners in the upper shaft to carry the entire load until the fasteners deform and the joint slips into bearing.

Usually, for direct load only, thicknesses used for splice plates are as follows:

Column weight Splice-plate lb/ft thickness, in

Up to 233 M

Over 233 %

Four fasteners are used in each half of a 3/s-in splice plate and six fasteners in each half of a z/2-in or heavier splice plate.

If, however, the joint carries tension or bending moments, the plate size and number of fasteners must be designed to carry the load. An equivalent amount of weld may be used instead of fasteners.

FIGURE 5.33 Lifting lug facilitates column erection.
FIGURE 5.34 Column splice with flange plates. A hole in each plate is used for erection of the lower column.

A combination of shop-welded and field-welded connection material is usually required for moment connections. Splice plates are shop welded to the top of the lower shaft and field welded to the bottom of the upper shaft. For field alignment, a web splice plate can be shop bolted or welded to one shaft and field bolted to the other. A single plate nearly full width of the web with two to four fasteners, depending on column size, allows the erector to align the shafts before the flange plates are welded.

Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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