Shifted neutral axis method

Procedure 4-14 Design of Base Details for Vertical Vessels - Shifted Neutral Axis Method [4,9,13,17,18]... 

The Equivalent Area Method is also known as file Shifted Neutral Axis Method . This procedure is in contrast with the Centered Neutral Axis Method which assumes that the neutral axis is on the centerline. The Centered Neutral Axis Method is easier to apply but also results in a conservative anchorage design. The Equivalent Area method is more accurate and will result in reduced anchorage requirements. Both methods are used to determine the anchorage requirements and the base plate details of a vertical vessel supported on a skirt. 

The Equivalent Area Method is based on reinforced concrete beam design that utilizes a balance between the steel in tension and the concrete in compression. Because of the different properties the neutral axis is shifted from the centerline. This procedure enables the designer to find the exact position of the neutral axis and compute the properties required based on this location. 

As an example, we discuss a structural study, by the Rietveld [10] method, of neutral poly thiophene [11]. This polymer is, sofar, the most ordered polyheterocycle, even though no oriented films have been obtained up to now, and so the only available samples are thermally annealed powders. Interestingly, aside from the expected (and found) co-planarity between adjacent rings, the detected 3-D order can be interpreted in terms of a discrete number of preferred arrangements, each of them shifted with respect to another along the chain axis, and co-present in the crystallites. This hypothesis accounts for the relative doping ease of polythiophene. 

---