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Empirical Models for the Shear Capacity and Stiffness of X-Shaped Screw Connections in Timber-Concrete Composite Structures
Modelos empíricos de resistencia al cortante y rigidez para conexiones de tornillos en X en estructuras compuestas de madera-concreto
DOI:
https://doi.org/10.15446/ing.investig.116327Keywords:
timber-concrete composite structures, timber structures, timber connections (en)estructuras compuestas de madera y concreto, estructuras de madera, conexiones de madera (es)
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In the literature, experimental data on X-shaped screw connections have been analyzed in order to develop an empirical model for their shear force capacity and stiffness, which are important parameters in designing timber-concrete composite structures. Although considerable research has been conducted worldwide to understand the composite action of timber and concrete, there is no generic model for determining the shear force capacity and stiffness of screw connections; most of the existing models are based on theoretical derivations. In this paper, empirical models are derived to determine the shear capacity of screw connections installed in X-shaped arrangements, considering the embedment and withdrawal strength of the screws within the timber and concrete. Moreover, a stiffness model based on global flexibility, as influenced by the material properties of timber, concrete, and screws, is elaborated. The model is validated using existing push-pull data and variations in material properties. A comparison with a well-known model demonstrates the suitability of our proposal. This model can be used to predict the shear force capacity and stiffness of X-shaped screw connections in timber-concrete composite structures.
En la literatura se han analizado datos experimentales sobre las uniones con tornillos en X, a fin de desarrollar un modelo empírico de su resistencia al cortante y rigidez, parámetros importantes en el diseño de estructuras compuestas de madera-concreto. Aunque se ha llevado a cabo una cantidad considerable de investigaciones a nivel mundial para comprender la acción compuesta de la madera y el concreto, no existe un modelo genérico para determinar la resistencia al cortante y la rigidez de las uniones con tornillos; la mayoría de los modelos existentes se basan en derivaciones teóricas. En este trabajo se derivan modelos empíricos para determinar la resistencia al cortante de las uniones con tornillos en X, considerando la resistencia al empotramiento y al arranque de los tornillos en la madera y el concreto. Además, se elabora un modelo de rigidez basado en la flexibilidad global, influenciada por las propiedades de los materiales de la madera, el concreto y los tornillos. El modelo se valida utilizando datos experimentales de ensayos push-pull y variaciones en las propiedades de los materiales. Una comparación con un modelo reconocido demuestra la idoneidad de nuestra propuesta. Este modelo puede emplearse para predecir la resistencia al cortante y la rigidez de las uniones con tornillos en X en estructuras compuestas de madera-concreto.
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Universiti Sains Malaysia
Grant numbers 304/PAWAM/6315691
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Copyright (c) 2025 Mohd Amirul Bin Mohd Snin, Anis Hanim Ghazali, Deng Haolin
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