Browsing by Author "Jara-Cisterna, Alan"

Now showing 1 - 4 of 4
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    Economic and technical analysis of CLT production facilities: an application to small and emerging markets
    (2022) Benedetti, Franco; Rosales, Victor; Jelvez, Arnaldo; Nunez, Mario; Rebolledo, Alonso; Jara-Cisterna, Alan
    The CLT market is quickly growing and developing in different regions of the world. However, the production and consumption are highly concentrated in Central Europe (Austria, Germany, Italy, and Switzerland). Due to the elevated levels of personalization required for the construction projects, the CLT manufacturing process involves costly and specialized equipment that represents an entry barrier for domestic producers in markets where the demand is small and incipient. This work discusses a production model and supply chain integration for the development of the CLT industry in emerging environments where the product and its properties are not well-known. Furthermore, a comprehensive economic analysis is performed for three small capacity mills designed according to SMEs capabilities. Findings suggest that CLT manufacturing with low-capacity plants (less than 10,000 m(3)/yr) is profitable but high levels of integration are required. The most influential variables in the economic results are the lumber cost and production volume; therefore, special attention must be paid to the efficiency of the process. Despite the small size of the studied plants promoted by the proposed production and plant design model, the sale price is attractive and competitive.
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    In-plane testing and hysteretic modeling of steel-spline cross-laminated timber diaphragm connection with self-tapping screws
    (2024) Chacon, Matias F.; Jara-Cisterna, Alan; Benedetti, Franco; Veliz, Fernando; Guindos, Pablo
    This study examines experimentally and numerically the in-plane behavior of a steel-spline Cross-Laminated Timber (CLT) connection with self-tapping screws. Although this connection is a strong, rapid, and cost-effective alternative suitable for CLT diaphragms of tall timber-concrete buildings, no previous cyclic/monotonic testing has been documented. Two specimens were tested under axial and in-plane shear loads, where a ductile failure mode was observed due to bending and withdrawal of screws, and deformation and buckling of the strap. Mechanic properties, such as strength capacity, stiffness, ductility, energy dissipation, equivalent viscous damping, stiffness/strength degradation, and damage index characterize the joint. Furthermore, the yield point and ductility were calculated with the EEEP, CEN, and Yasumura-Kawai methods, the last approach most accurate, with a mean ductility of 7.25 and 5.50 for the axial and in-plane shear tests, respectively. Overstrength factors of about 2.6 and 1.9 were also estimated for respective tests by comparing analytical expressions from timber codes and literature. Finally, three numerical models (SAWS, DowelType, and ASPID) were assessed to measure their epistemic uncertainty, showing an adequate force and dissipated energy history simulation, with a normalized root mean square less than 8.8% and 4.5%, and R(2 )over 87% and 97%, respectively. {GRAPHICAL ABSTRACT}
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    Numerical Analysis of the Seismic Performance of Light-Frame Timber Buildings Using a Detailed Model
    (2022) Benedetti, Franco; Jara-Cisterna, Alan; Carlos Grandon, Juan; Astroza, Nicool; Opazo-Vega, Alexander
    Timber structures have gained interest for the construction of mid-rise buildings, but their seismic performance is still a matter under development. In this study, a numerical analysis of the seismic performance of light-frame timber buildings is developed through a highly detailed model using parallel computing tools. All of the lateral-load-resisting system components and connections are modeled. Combinations of lateral load capacity distributions in structures of one, three, and five stories are studied in order to assess the effects on the global performance of different triggered failure modes through nonlinear static and dynamic analyses. The results suggest that shear bracket connections and sheathing-to-framing connections control the buildings' responses, as well as the failure mode. For a ductile response, the lateral displacement must be dominated by the in-plane wall distortion (racking); therefore, the system must be provided with a story shear sliding stiffness and load capacity at least twice that of the walls. Furthermore, based on the pushover capacity curves, the performance limits are proposed by evaluating the stiffness degradation. Finally, the effect of the mobilized failure mode on the structural fragility is analyzed. Even though standard desktop PCs are used in this research, significant reductions in the computation effort are achieved.
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    Vibration-based monitoring of a cross-laminated timber building in a high seismicity zone
    (2024) Jara-Cisterna, Alan; Benedetti, Franco; Rosales, Victor; Almazan, Jose Luis; Opazo-Vega, Alexander
    Cross-laminated timber (CLT) buildings have emerged as an alternative to make more sustainable and resilient cities. However, very few cases of vibration-based monitoring of these buildings have been reported. This paper discusses the variation of the dynamic properties of a 5-story cross-laminated timber (CLT) building through vibration-based monitoring over 23 months. The building combines different construction systems, is relatively slender for its type, and was built in a high seismicity zone. The monitoring strategy included periodic measurements of the dynamic properties during construction, reference measurements with high-sensitivity accelerometers, and 10 months of continuous measurements with low-cost equipment. In addition, continuous measurements allowed the analysis of the dynamic properties during special events associated with wind gusts and moderate-intensity earthquakes. During the construction stage monitoring and reference measurements, up to 5 modal shapes of the building with their respective vibration frequencies and damping ratios were detected. These dynamic properties allowed the calibration of a simplified numerical model of the building. Subsequently, during the continuous monitoring phase of the building, it was observed that the first two translation frequencies varied by up to 8% due to changes in climatic conditions and the moisture content of the timber. Finally, monitoring during a 5.4 Mw earthquake showed that vibration frequencies temporarily decreased by up to 15% and returned to their initial value after the seismic event had passed. The results of this research will contribute to the knowledge of the dynamic response of this type of building and the updating of their structural design codes.