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Theses

Exploration structurelle et environnementale des ouvrages en bois de grande portée

Abstract : This thesis investigates the levers for optimizing long-span timber structures both on the mechanical and on the environmental levels. The current development of timber construction urges designers to question in depth the structural systems and construction principles suited to this material and particularly to reflect upon the mechanical behavior, the manufacturing, and the cost of timber connections.First, using a statistical approach, we propose to develop a simplified model to assess the stiffness and the mass of a dowel connection based on a limited number of input variables ((N, V , M) torsor and cross-section form factor), so that it can be easily used in structural design models. Then, through a simple illustrative example, we study the impact of semi-rigid connections on the shape optimization of a glulam-braced frame, part of the lateral load resisting systems of a high-rise building.Furthermore, the connections, which often requires the most complex manufacturing process, cannot be overlooked when assessing the costs and environmental impacts of a timber structure. Therefore, we present a life cycle analysis (LCA) framework for evaluating the environmental impacts of a timber structure with a particular focus on connections and especially suited to the first phases of the design during which the most fundamental choices are made. To that end, we introduce methods for selecting and reducing the number of LCA indicators. First, the contribution of midpoint indicators to endpoint impacts is analyzed to identify the most relevant indicators that dominate the absolute impact of the system on the damage level. Secondly, we propose the use of a ranking and range error index (RREI) to select uncorrelated indicators over a given set of scenarios.In light of the proposed limited set of indicators and the simplified model of dow-el-type connections developed in this work, we finally investigate ways of optimizing long-span timber structures. Through two case studies, one on a truss and one on a gridshell, we illustrate the centrality of the design and behavior of connections in relation to the continuity of the elements, the density of the connections, and the choice of materials in the structure.
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  • HAL Id : tel-03572887, version 1

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Koliann Mam. Exploration structurelle et environnementale des ouvrages en bois de grande portée. Structures. École des Ponts ParisTech, 2021. Français. ⟨NNT : 2021ENPC0035⟩. ⟨tel-03572887⟩

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