Structural Engineering

What Is The World’s Furthest Leaning Tower?

by Jonathan Locke September 28, 2017
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                The Capital Gate in Abu Dhabi is the furthest leaning tower in the world.  How far does it lean? Let’s look at the universally known Leaning Tower of Pisa for comparison.  It leans at 3.97 degrees, which […]

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Reviewing Elongation Reports

by Calvin Curtis August 25, 2017
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At this point, I think it’s fair to say that I’m a proponent of post-tensioned structures.  I’ve found that they can be very economical, and there are many things you can only do with post-tensioned concrete.  However, there’s one point that I think all structural engineers […]

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Balancing Post-Tension

by Calvin Curtis May 15, 2017

Last month, I wrote a quick post about understanding the sources of long-term losses with post-tension tendons.  One of the key points to take away from that is that the more post-tension material you use, the less effective each individual tendon becomes.  However, this is […]

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Denver Dad Saves $$$ on Post-Tension Tendon Supports Using One Simple Trick

by Calvin Curtis April 7, 2017

Last month, I discussed the need for precompression in a post-tensioned slab.  In that post, I mentioned that the code minimum amount of precompression is 125 psi for elevated slabs. I’ve also mentioned some of the various types of elevated decks in the past.  One […]

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Top Five Toys for Structural Engineers

by Katelyn Wager January 20, 2017
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A countless number of toys exist today, but there are a few that have become the favorites of structural engineers.  Below is a list of the top toys that will help kids start thinking about structural design and get their creative juices flowing. Legos – […]

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Precompression vs. Balanced Load in Post-Tension Concrete

by Calvin Curtis January 6, 2017

My Post-Tension elevator speech is pretty well rehearsed at this point: “We drape steel cables — tendons — in the concrete forms, and then place the concrete.  Once it cures, we pull the ends of the tendons, which try to straighten out.  That does three […]

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What is Punching Shear?

by Calvin Curtis November 30, 2016
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There are several factors that come into play when designing an elevated concrete slab.  Obviously, the ability to support the design loads comes first, followed by the allowable deflections and long-term serviceability of the slab.  However, the factor that most frequently comes up when I’m […]

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Sequential Stressing and Elastic Losses

by Calvin Curtis November 30, 2016
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In a previous post, I discussed the sources of short- and long-term losses in unbonded post-tension tendons.  Recently, a question came up on one of my LinkedIn groups regarding elastic shortening and sequential stressing. To refresh your minds, concrete — which is generally regarded by […]

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Denver Engineers Not Surprised by New Post-Tension Rule

by Calvin Curtis November 30, 2016
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Good day!  Your usual post-tension maniac here, with more exciting information on post-tensioning! A few months ago, I mentioned that finishing post-tension tendons was an area of special concern, since corrosion is very much the arch-enemy of post-tension tendons.  There are actually a lot of […]

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EVstudio and Oakwood Homes: Castle Rock, CO “The Reagan”

by Shannon Osiecki March 2, 2016
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EVstudio was hired to produce full sets of structural plans for several Oakwood homes, including “The Reagan: Carriage House at The Meadows,” located in Castle Rock, Colorado.  ”The Reagan” is one of many options for the Meadows community. “The Reagan” is a 3-story house.  The […]

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Damaged Post-Tension Tendons

by Calvin Curtis February 25, 2016
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I’ve written a great deal in the last couple of years regarding design considerations for post-tension slabs, as well as the “right” way to install and finish post-tension tendons.  And while I’ve touched briefly on some of the potential pitfalls of post-tensioning, I haven’t discussed […]

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Restrained versus Unrestrained Members

by Calvin Curtis January 22, 2016
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In the last several months, I’ve had many questions about what constitutes a “restrained” concrete member, and what constitutes an “unrestrained” concrete member.  The volume has been such that I’ve decided to take a break from my usual post-tensioned discussions and lay this out. This […]

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