Q:A client asked me to build a garage that will also house the furnace. I need to install a bollard that would prevent a car from rolling into the furnace. What are the engineering requirements for such a structure, and do you have any suggestions for ways of making one?

A: Bill Palmer Jr., an engineer and the editor-in-chief of Concrete Construction, a sister publication of JLC, responds: Interestingly, much of today's bollard design comes from military applications, such as stopping a large truck from running through a blockade—that's when you get into some serious design! But whether you're stopping a...

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