RISK-BASED DESIGN CHECK FOR COLLAPSE SAFETY USING FEW GROUND MOTIONS

Abstract eng:
The 3R method (Response analysis, Record selection, Risk-based decision making), which is used to check the adequacy of structural collapse safety by few nonlinear dynamic analyses, is briefly presented. The 3R method uses characteristic ground motions, which are selected by two-step selection procedure. Hazard-consistent set of ground motions is selected in the first step, while in the second step a subset of a few ground motions is obtained on the basis of the seismic response analysis of equivalent single-degree-of-freedom model, which is not computationally demanding. All ground motions are scaled to single intensity level, which corresponds to target collapse risk. The objective of the method is not precise assessment of collapse risk, but decision making whether the collapse risk is lower or greater in comparison to the target collapse risk. For this reason simple decision model may be introduced. If collapse is observed for less than half of characteristic ground motions, it can be decided that the reliability of structure against collapse is appropriate and vice versa. For an example of reinforced concrete dual structural system it is shown that an intensity-based assessment can provide sufficiently accurate risk-based decision making.

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