Browsing by Author "Berwart Astudillo, Sebastián Ignacio"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Case study: Seismic and gravitational design of 15-story office and residential building archetypes with a semirigid clt diaphragm and reinforced concrete shear walls in Chile
    (World Conference on Timber Engineering (WCTE), 2025) Barrios Pi, Sebastián Andres; Veliz Sanzana, Fernando Daniel; Berwart Astudillo, Sebastián Ignacio; Montaño Castañeda, Jairo Alonso; Araya Miranda, Raúl Eduardo; Lagos, Guzmán Jorge; Beltrán Beltrán, Martín Aleksei Ignacio; Chacón De La Cruz, Matías Fernando Nicolás; Valdivieso Cascante, Diego Nicolás; Guindos Bretones, Pablo; Almazan Campillay, José Luis; Santa María, Oyanedel Hernan
    This study is part of the "Ciudad Madera" technological consortium, which seeks to promote widespread wood construction in Chile, whose seismic code provides no guidance for cross-laminated-timber (CLT) seismic diaphragms. Currently, this lack of a design methodology for Hybrid Mass-Timber-Reinforced-Concrete (HMT-RC) buildings, has pushed a tendency for structural designers to solely rely on the concrete topping as the seismic horizontal diaphragm element. This study validates HMT - RC and develops a seismic-design method for buildings up to 15 stories high, with CLT floor system performing as the seismic diaphragm. Twenty monotonic/cyclic connector tests and six full-scale 4 m × 4 m Radiata-pine CLT diaphragm tests will calibrate nonlinear models of office and residential building archetypes, analyzed in a 72-case parametric matrix (height, seismic zone, soil class, design philosophy). Findings show: (i) RC-core and coupling-beam detailing governs drift, (ii) flooring size is controlled by a vibration criterion, and (iii) commercial timber column-to-column splices meet seismic inter-story rotation demands.
  • No Thumbnail Available
    Item
    The link frame model (LFM), a tool for the seismic analysis of timber frame buildings considering system effects
    (2025) López Rodríguez, Nicol Ester; Berwart Astudillo, Sebastián Ignacio; Guindos Bretones, Pablo
    This article proposes a model that makes possible the seismic analysis of timber frame multistory buildings in general-purpose software. The model is entitled link frame model (LFM) and shows the following advantages in comparison to previous models: (1) it can model shearwalls only with frame elements and links with errors close to 0% with respect to analytical code models such as e.g. the special design provisions for wind and seismic (SDPWS); (2) for seismic analysis, both the static analysis method and the modal spectral analysis method can be used, in addition to the gravitational analysis; (3) the computation of the natural period shows deviations close to 0% in comparison with eigenvalues and eigenvectors; (4) it can be implemented in general purpose structural analysis software such as e.g. ETABS or SAP2000; and (5) building system effects, i.e. interaction of shearwalls with other assemblies, can optionally be captured if assigning the proper diaphragm out-of-plane flexural stiffness. Given the great impact of this last aspect in practical design, and the lack of its research, this paper does not only present the model and validation itself, but also analyzes the consequences of considering system effects in a representative case study building. The analysis demonstrates that the average shearwall tension (uplift) of regular buildings can decrease by 80% if considering system effects, which could make timber buildings much more cost competitive in seismic countries.