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This paper investigates a novel mid-rise large-span cassette structure. The unique limit state divisions of the cassette structure are studied by following the probabilistic seismic capacity analysis (PSCA) method. A numerical model is established and verified through the use of shake table test results. Multidirectional pushover analyses is performed, and the directional effect of the 3D cassette structure is considered. The uncertainty present in fourteen major structural parameters is also considered in the modelling by using Latin hypercube sampling (LHS). The probability density function (PDF), cumulative distribution function (CDF), coefficient of variability (COV) and PSCA curves are obtained. The probabilistic distributions of the PSCA curves suggest that the threshold values of the maximum storey drift ratios of the large-span cassette are 1/550, 1/200, 1/60, and 1/25 for the slight damage (SD), moderate damage (MD), extensive damage (ED) and complete damage (CD) limit states, respectively. Furthermore, the average median values and logarithmic standard deviations are also given for the further probabilistic seismic fragility analysis and structural assessment performed. Finally, sensitivity analyses are conducted to examine the effects of critical structural parameters on structural damage measures. The results show that the structural performance is more sensitive to material parameters than load parameters.

Probabilistic Seismic Capacity Analysis of a Novel Mid-rise Large-span Cassette Structure Using Multidirectional Pushover Method