Finite Element Modelling of Prefabricated Soft Story Building Using Optum CS

Driven by rapid urbanization, the demand for fast,
economical construction has accelerated the adoption of
prefabricated building systems worldwide. However, soft-story
configurations where ground levels feature open layouts for
parking or commercial spaces remain exceptionally vulnerable to
lateral forces from seismic activity and wind loads. To address
these vulnerabilities efficiently, this study integrates artificial
intelligence surrogate modeling alongside Optum CS 2023
v3.1.605.0 nonlinear finite element analysis to evaluate the
structural response of prefabricated soft-story multi-story buildings
across four height levels G+1, G+2, G+3, and G+4. The evaluation
utilizes standard prefabricated wall panels and deck slabs
composed of C25 concrete and S500 reinforcement steel. AI
machine learning algorithms were coupled with the finite element
framework to optimize computational workflows, accurately
predict complex stress distributions, and quantify rigidity
reduction, soft-story drift, load multipliers, wall slice capacity, and
beam utilization across all modeled configurations. The integrated
analysis demonstrates a sharp inverse relationship between overall
building height and lateral load carrying capacity. As structural
height increases, load multipliers drop significantly from 0.39 for
the G+1 model to 0.15 for the G+4 model, accompanied by a
progressive increase in soft-story drift amplification. However,
machine learning verification confirms that both wall slice capacity

and beam utilization remain safely within the limits specified by
Eurocode standards across all height variants. Ultimately,
combining AI-driven predictive analytics with nonlinear finite
element analysis proves that prefabricated modular soft-story
systems offer sufficient structural integrity for low- to mid-rise
developments. For taller multi-story configurations, AI sensitivity
mapping emphasizes that the rapid degradation of load capacity
and elevated drift necessitate supplemental lateral strengthening
measures, such as shear bracing or dampening systems, to
guarantee seismic stability.

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