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Old Structures Engineering

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Old Structures Engineering: Old Structures Engineering

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Two Arches

First, from Providence, a stone arch holding up some of the front facade of a bearing-wall building:

If you look closely, there are some cracks around the individual voussoirs. Given the short span and the relatively large depth of the arch, it should be fine under load. I actually wonder if the cracks are because it’s not loaded heavily enough to create enough ...

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An Arms Race

The new subway turnstiles originally had just round bars. Then the curved fins were attached to make it more difficult for people to hp over by balancing off the bar. The most recent addition is the steel sheet between the turnstiles with the sawtooth top, to keep people form jumping over by pushing up off the sides.

One solution is what’s known as a href="ht...

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Blog Post Title

No, I didn’t forget to change the title. This is a blog post about blog post titles. On several occasions, most recently at the APT conference in Providence, someone has made a point of saying to me that they specifically liked or disliked the way I title posts. In other words, not the content, but the titles had caught their eye.

Here is, in my opinion, the platoni...

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Design Decisions

The coffee shop across the street from the Rhode Island Convention Center, looking up:

This is a modern one-story building, apparently built with the taller commercial building next door. So we’re looking at the underside of the roof, with some of the architectural elements (the track lights, the exist sign, the duct grilles) defining a virtual ceiling plane. Th...

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Pretty Lights

From the Wurts Brothers, circa 1932, “General View – Manhattan – Aerial view – Night view from Empire State Building – looking northwest”:

Just to orient things a bit, the black stripe running form the middle of the left side of the view a little bit diagonally above horizontal to the right is the Hudson River. It was a reasonably clear night: you can see the “n...

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