Articles
Getting Twisted about Helical Strakes
If you have a vortex shedding problem on a stack, then in some cases helical strakes are your best option; however, there are other cases where helical strakes are not the best option. When not to use Helical Strakes? If there is another stack (or tall structure) that is nearby, then the interference effects will cause the…
It’s not my Default
There is a feature in MecaWind that is seldom used, but can be very helpful. It’s a feature under the File Menu called “Save Current File as Default”. What does it do? When this feature is is selected, it takes the current file and sets it up as the default file that will be opened the…
The Next Big Thing in Lifting Lug Design
All structural design is important but verifying that the lifting lug design is adequate to lift a piece of heavy equipment might just be one of the most important things an Engineer can design. Engineers often design structures and equipment for extreme wind, seismic and other loading that may never occur; however, in the case…
Take Vortex Shedding Seriously
When I was a new Engineer working for an equipment manufacturer, I can say that I didn’t have a healthy appreciation for wind Induced vibration (vortex shedding). I worked for an equipment manufacturer who won and lost jobs based upon our cost, and considering vortex shedding increased our cost and decreased our competitiveness. We really…
MecaStack Default File
There is a feature in MecaStack that is seldom used, but can be very helpful. It’s a feature under the File Menu called “Save Current File as Default”. What does it do? When this feature is is selected, it takes the current file and sets it up as the default file that will be opened the…
ASCE 7-16 Wind Changes
The ASCE 7-16 Minimum Design Loads for Buildings and Other Structures was released in the Summer of 2017, and some jurisdictions are starting to reference this standard. MecaStack has a built in calculator for ASCE 7 wind loads on the stack, but Meca also offers a program called MecaWind which calculates wind loads on any type of structure per…
Tune up your next Stack
One of the most common problems encountered on a cylindrical stack is Wind Induced vibration due to Vortex Shedding. If you have never visually observed vortex shedding, watch this brief video and prepare to be amazed. There are a couple of options to address this problem, and this newsletter discusses the option of Tuned Mass Dampers (TMD).…
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