Publicacións

@article{veliz_structural_2024,

title = {Structural performance of strong timber diaphragms: High-capacity light-timber frames and cross-laminated timber},

author = {Fernando Véliz and Matias F. Chacón and Jorge Lagos and Sebastián Berwart and Nicol López and Pablo Guindos-Bretones},

url = {https://www.sciencedirect.com/science/article/pii/S2352012424004879},

doi = {10.1016/j.istruc.2024.106335},

issn = {2352-0124},

year  = {2024},

date = {2024-05-01},

urldate = {2026-04-20},

journal = {Structures},

volume = {63},

pages = {106335},

abstract = {The construction of tall timber buildings is not only challenging because it requires stronger vertical lateral systems but also because it demands much Stronger Timber (ST) diaphragms in comparison to the ones required by low-rise timber construction. Two main ST alternatives exist: High-capacity Light-Timber Frame (HLTF) and Cross-Laminated Timber (CLT) diaphragms. Both approaches provide more strength, stiffness, and still have the potential to provide ductile failure than traditional timber diaphragms. However, it is unclear the structural performance differences between these two ST alternatives, which is the aim of this research. In this study, an experimental program comprising the monotonic and cyclic testing of several representative sheathing-to-framing connections, plus the full-scale monotonic bending testing of six HLTF and CLT diaphragms was accomplished to characterize and compare the performance of both ST diaphragm configurations. Failure modes and mechanical properties such as stiffness, load-bearing capacity, and ductility were evaluated for all specimens. Results show that HLTF diaphragms have larger load-bearing capacity than CLT ones. Conversely, CLT diaphragms perform more ductile than HLTF ones, with a mean of μ= 1.87 and μ= 3.5, respectively, where the first was due mainly to high plastification of fasteners and the second to premature brittle failure of some components. Furthermore, the experimental findings were utilized to evaluate the precision of prevailing analytical and numerical models, thereby illustrating their capability to adequately represent the elastic and nonlinear responses of both ST alternatives. Finally, a sensitivity analysis of a two–story wall building with varying diaphragm (LTF, HLTF and CLT) and different light-frame shear walls (rigid and flexible) was studied. Both the diaphragms and shear walls were modeled under two different equivalent diagonal link models. The sensitivity analysis concluded that both flexible diaphragm assumption and envelope approach might not be an efficient solution, while semi-rigid approach with flexibility index η ranging 0–0.5 may be expected when using ST with LTF shear walls. Finally, the diaphragm model employed enabled the validation of its elastic behavior under lateral loads, with use factors under 30% for typical setups.},

keywords = {Analytical displacement model, Cross-laminated timber, Finite element models, Full-scale experimental tests, High-capacity light-timber frames, In-plane monotonic bending tests, Sensitivity analysis, Strong timber diaphragms},

pubstate = {published},

tppubtype = {article}

}

@article{naves_global_2020,

title = {Global and local sensitivity analysis to improve the understanding of physically-based urban wash-off models from high-resolution laboratory experiments},

author = {Juan Naves-García-Rendueles and J. Rieckermann and Luis Cea-Gómez and Jerónimo Puertas-Agudo and Jose Anta-Álvarez},

url = {https://www.sciencedirect.com/science/article/pii/S0048969719361480},

doi = {10.1016/j.scitotenv.2019.136152},

issn = {0048-9697},

year  = {2020},

date = {2020-03-01},

urldate = {2026-08-06},

journal = {Science of The Total Environment},

volume = {709},

pages = {136152},

abstract = {Physically-based urban wash-off models are a promising means of studying the transport of finer suspended solids and their associated pollutants during rain events, considering spatial and temporal heterogeneities. This study contributes to the understanding of these models through an in-depth sensitivity analysis to provide the necessary information to simplify the model and deal with parameter identifiability. First, based on twelve tailored high-resolution experiments, the accurate measurement of input variables was used to study the parameters of the Hairsine-Rose sediment transport model through a global sensitivity analysis. Using Standardized Regression Coefficients (SRC) and Extended Fourier Amplitude Sensitivity Test (EFAST) methods, the analysis showed that both the total washed-off mass and the TSS peaks concentration are highly sensitive to the critical mass, which considers the reduction in the detachment of particles when the sediment available decreases and is scattered over the surface. In addition, the rain- and flow-driven detachment parameters were presented as key for smaller and larger sediment particles, respectively. Then, those uncertainties that are associated in field studies with the determination of the model input variables were also considered by conducting a local sensitivity analysis. The initial load of sediment and the mean grain size were seen to be the most important variables, thus underlining the need for very accurate measurements here. Moreover, a precise definition of Harsine-Rose parameters is also necessary to achieve reliable results in order to work on treatment and management techniques to minimize the impact of urban surface contaminants on urban environments.},

keywords = {2D shallow water model, Hairsine-Rose model, Iber, Sensitivity analysis, Urban wash-off modelling},

pubstate = {published},

tppubtype = {article}

}