Effective Width

FIGURE 4.36 Effective width of a closed rib.

se (in) may be found from Eq. (4.166). For determination of shears, reactions, and moments, it is sufficiently accurate to take ae = a and ee = e. (The error in using the resulting section for stress computations usually also will be small.) Then, in terms of the values given by Table 4.7, the effective plate width for a closed rib is a'0 + e'a = a°ae + J ec (4.179)

ae ee

The flexural rigidity in the longitudinal direction usually is taken as the average for the orthotropic plate. Thus

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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