RT info:eu-repo/semantics/article T1 Limit analysis of 3D building structures A1 Cacho-Pérez, M. K1 Estructuras de barras K1 Análisis plástico K1 Limit analysis K1 Building structures K1 Collapse load factor K1 Collapse mechanism K1 Uniform distributed loads K1 3305 Tecnología de la Construcción AB In this work, a limit analysis of typical building frames is carried out, and the collapse load and collapse mechanism of 3D frames composed of slender steel structural elements under concentrated and uniformly distributed loads are calculated. To this end, the direct kinematic method and nonlinear optimization techniques are proposed to search for the collapse mechanism and determine the collapse load. This work has the advantage that the structure’s equilibrium equations are obtained through a completely systematic formulation of the problem of interest. In many cases, the case of uniformly distributed loads is simplified by equivalent point loads. However, this work verifies that the results differ in the cases of point loads and uniformly distributed loads, both qualitatively and quantitatively. PB Elsevier SN 0143-974X YR 2025 FD 2025 LK https://uvadoc.uva.es/handle/10324/76021 UL https://uvadoc.uva.es/handle/10324/76021 LA eng NO Journal of Constructional Steel Research, Volume 234, 2025, 109662, ISSN 0143-974X NO Producción Científica DS UVaDOC RD 21-jun-2025