Report - PEER - University of California, Berkeley

Traditionally, structural engineers have paid scant attention to NCCs becausetheir design and detailing had not formed part of the structural-engineering scope ofwork. In those cases where structural engineers have designed and detailed NCCs, thecomponents have been analyzed and designed (albeit indirectly) for the output of thestructural framing. We contend that such an approach is inappropriate and that theperformance-based design process should focus first and foremost on the mostsignificant investments in the building, namely, the nonstructural components andcontents.100%80%60%40%20%0%20%62%18%17%70%13%Figure 1. Investments in building construction (after E. Miranda).2. UPDATING THE DESIGN PARADIGMFigure 2 (from Hamburger) below illustrates the flow of a performance-based designprocedure. Step 2 in the procedure involves selecting a preliminary design of theframing system (framing layout, system type, material, etc), which is then analyzed instep 3 for performance capability. In a robust performance assessment, this stepwould include design of both structural components and nonstructural components. Ifthe computed performance is unacceptable, the design of the structural andnonstructural components is revised and then re-analyzed for performance capability.44%48%8%Office Hotel HospitalSelectPerformanceObjectivesContentsNonstructuralStructuralDevelopPreliminaryDesignReviseDesignAssessPerformanceCapabilityNoDoes DesignMeetObjectives ?YesDoneFigure 2. A performance-based design procedure (after R. Hamburger).114