Analysis

The FIU Bridge Accident Report

I wrote about the FIU bridge collapse this past summer when the OSHA report came out. The more comprehensive analysis from the National Transportation Safety Board has been released, and it brought up a lot of the same issues for me. In short, regardless of the mistakes that led to the specific accident that occurred, …

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Strain Compatibility Visualized

Some engineering concepts are easy to explain. For example, the idea that stress and strain are related can also be expressed, crudely, as objects squash when you push on them. Everyone understands that on an intuitive level. Other concepts, like strain compatibility, are a little more difficult. The short version of strain compatibility, if I …

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Mansard Stability

The defining feature of a mansard roof, a sloped facade/roof, is mildly problematic as structure. Under just the gravity load of the wall’s own weight, there is a small overturning moment, which is resisted as an inward thrust at the top and an outward thrust at the base. If the sloped wall is carrying other …

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