44 Stresses In Arch Ribs

Equating moments about X to zero yields p

FIGURE 4.4 Arch stresses at any point may be determined from forces at the elastic center.

FIGURE 4.4 Arch stresses at any point may be determined from forces at the elastic center.

For structural steel members, the shearing force on a section usually is assumed to be carried only by the web. In built-up members, the shear determines the size and spacing of fasteners or welds between web and flanges. The full (gross) section of the arch rib generally is assumed to resist the combination of axial thrust and moment.

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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