Effect of multi-component excitation on the sliding response of unanchored components in nuclear facilities

• 1st investigation on the effect of multi-axis seismic excitation bidirectional sliding components. Evaluates ASCE 43-05 and 4-16 nuclear standards for displacement. different intensity measures response During an earthquake, equipment left unanchored in a facility can slide interact with safety-critical systems components, posing safety risk to facility. However, computing especially two directions, be computationally expensive during preliminary design stages. Nuclear acknowledge this by providing alternative, approximate method estimating This paper investigates horizontal interaction influence vertical component It also evaluates explores multi-component predicting A decoupled analysis approach is taken where suite 40 floor acceleration histories obtained from history representative power plant are used as input analyze Bouc-Wen type model determine nonlinear The computed responses components under uni-, bi-, tri-axial examined, along method, it concluded that significantly overconservative all cases. greatest sites high shaking at higher friction coefficients. Different evaluated, found most efficient peak velocity (PFV) low coefficient values (PFA) values; efficiency these not affected incorporating multiple excitation.