Because structural detailing is governed by physics and codes that change slowly, but software licensing changes fast. The represents the last definitive written record of a tool that millions of tons of concrete and steel were designed with.
For example, if you open the PDF and search for you will learn that ACSD 2015 uses a constraint-based system similar to Dynamic Blocks. The manual provides the exact formula for anchoring a bar to a concrete face so that if the beam size changes, the bar stretches automatically. autocad structural detailing 2015 manual pdf full
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