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This is less than the allowable tensile stress of 0.380 ksi. Therefore the design is OK.

7.3.6.2.3. Example 3: Flat Plate. Figure 7.44 shows a schematic section of a two-way flat plate system. Design of post-tension slab for an office-type loading is required. Given.

Specified compressive strength of concrete: f'c = 4000 psi Modulus of elasticity of concrete: Ec = 3834 ksi

Allowable tensile stress in precompressed tensile zone = 6-f = 380 psi Allowable fiber stress in compression = 0.45fC = 0.45 x 4000 = 1800 psi

Figure 7.44. Example 3: flat plate: (a) span and loading; (b) elastic moments due to dead load plus live load.

Tendon cover: Interior spans

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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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