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Query: "keywords" (nonlinear modelling) .

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1.
Glued-in rods in cross laminated timber - numerical simulations and parametric studies
Boris Azinović, Henrik Danielsson, Erik Serrano, Miha Kramar, 2019, original scientific article

Abstract: Numerical simulations and parametric studies of glued-in rods in cross-laminated timber have been performed. The simulations were based on 3D finite element analysis, using a cohesive surface model for the bond-lines between the laminations and the bond-line along the rod. The parametric studies investigated the influence of the glued-in length, the rod diameter, and the rod-to-grain angle on the load-bearing capacity and stiffness of the connection. The analyses showed that the load-bearing capacity generally increases with the glued-in length and the rod diameter, which agrees well with experiments. For different rod-to-grain angles, different mechanical behaviour was observed, especially considering the failure modes.
Keywords: glued-in rods, cross laminated timber (CLT), parametric study, nonlinear numerical modelling, glued-in length, rod diameter, rod orientation
Published in DiRROS: 13.09.2023; Views: 232; Downloads: 137
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2.
DendroTools : R package for studying linear and nonlinear responses between tree-rings and daily environmental data
Jernej Jevšenak, Tom Levanič, original scientific article

Abstract: We introduce in this paper the dendroTools R package for studying the statistical relationships between tree-ring parameters and daily environmental data. The core function of the package is daily_response(), which works by sliding a moving window through daily environmental data and calculating statistical metrics with one or more tree ring proxies. Possible metrics are correlation coefficient, coefficient of determination and adjusted coeffi- cient of determination. In addition to linear regression, it is possible to use a nonlinear artificial neural network with the Bayesian regularization training algorithm (brnn). dendroTools provides the opportunity to use daily climate data and robust nonlinear functions for the analysis of climate-growth relationships. Models should thus be better adapted to the real (continuous) growth of trees and should gain in predictive capabilities. The dendroTools R package is freely available in the CRAN repository. The functionality of the package is demonstrated on two examples, one using a mean vessel area (MVA) chronology and one a traditional tree-ring width (TRW).
Keywords: dendroclimatology, daily climate data, running window, nonlinear modelling, tree-ring proxies, climate reconstruction
Published in DiRROS: 16.04.2018; Views: 2974; Downloads: 1856
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