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Performance based approaches to construction become much more necessary as you move into more unique and challenging situations. The building codes have always been geared primarily towards basic construction for normal hazards, processes and occupant types. When we start to bridge outside those norms we are required to base our designs off sound engineering analysis and less on prescriptive code. I specialize heavily in performance based design and consultation, and will tell you the key problem you'll run into with performance based design. You are basing your design primarily off your own engineering analysis rather than an industry accepted standard. This in turn lays the full liability for your approach to the work and the product itself with your company. This tends to scare companies who do not wish to shoulder so much liability. It also places the AHJ in a potentially precarious position of needing to evaluate and approve your alternative approach, likely without having the knowledge base internally to do so effectively. However, if you can get pass these business complications to performance based design, you can in fact, design a product far superior and often time considerably cheaper than would be attainable via prescriptive based design.
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