This thesis discusses the results of experimental tests on two post-tensioned timber core-walls, tested under bi-directional quasi-static seismic loading. The half-scale two-storey test specimens included a stair with half-flight landings. Multi-storey timber structures are becoming increasingly desirable for architects and building owners due to their aesthetic and environmental benefits. In addition, there is increasing public pressure to have low damage structural systems with minimal business interruption after a moderate to severe seismic event. Timber has been used extensively for low-rise residential structures in the past, but has been utilised much less for multi-storey structures, traditionally limited to residential type building layouts which use light timber framing and include many walls to form a lateral load resisting system. This is undesirable for multi-storey commercial buildings which need large open spaces providing building owners with versatility in their desired floor plan. The use of Cross-Laminated Timber (CLT) panels for multi-storey timber buildings is gaining popularity throughout the world, especially for residential construction. Previous experimental testing has been done on the in-plane behaviour of single and coupled post-tensioned timber walls at the University of Canterbury and elsewhere. However, there has been very little research done on the 3D behaviour of timber walls that are orthogonal to each other and no research to date into post-tensioned CLT walls. The “high seismic option” consisted of full height post-tensioned CLT walls coupled with energy dissipating U-shaped Flexural Plates (UFPs) attached at the vertical joints between coupled wall panels and between wall panels and the steel corner columns. An alternative “low seismic option” consisted of post-tensioned CLT panels connected by screws, to provide a semi-rigid connection, allowing relative movement between the panels, producing some level of frictional energy dissipation.

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O principal objetivo deste trabalho é apresentar um estudo sobre análise de estrutura tridimensional de edifícios de andares múltiplos considerando a interação de deslocamentos e esforços entre os vários elementos que formam a estrutura, levando-se em consideração a rigidez transversal à flexão das lajes. Isto é realizado através de um modelo que compatibiliza o elemento que discretiza o núcleo com sete graus de liberdade, baseado na teoria da flexo-torção de Vlassov, com o restante da estrutura tridimensional de edifícios de andares múltiplos formada pelos núcleos, pilares, vigas e lajes. Os elementos finitos de placa adotados na discretização do pavimento, responsáveis pela consideração da rigidez transversal das lajes na análise do edifício são o DKT (Discrete Kirchhoff Theory) e DST (Discrete Shear Theory). Para os pilares e os núcleos o equilíbrio de forças é verificado na sua posição deformada, ou como é conhecido da literatura técnica, análise em teoria de 2ª ordem, considerando a não linearidade geométrica. Para o cálculo dos esforços e deslocamentos na estrutura são aplicadas as técnicas de subestruturação em série e paralelo na matriz de rigidez global da estrutura. Elaborou-se um programa de computador para o processo de cálculo, utilizando a linguagem computacional Fortran Power Station 90 e pré e pós processadores em Visual Basic 6.0 para ambiente Windows. Finalmente são apresentados alguns exemplos para comprovar a validade do processo de cálculo utilizado / The main aim of this work is to apresent a study about analysis of three-dimentional structures of multistory buildings considering the interaction of displacements and stresses of the elements of the structures, with the influence of the transverse bending stiffness of slabs. The plate finite elements adopted in floor discretization, responsible for considering the bending stiffness contribution of slabs in the analysis of buildings, are the DKT (Discrete Kirchhoff Theory) and the DST (Discrete Shear Theory). For columns and core walls the forces equilibrium is verified for the columns in their deformed position, which is known in the technical literature as second order analysis, considering the geometric non-linearity. The techniques of serial and parallel analyses of substructures are applied to the global stiffness matrix for the calculus of forces and displacements in the structure. A computer program was developed for the calculation process, using the computer language Fortran Power Station 90 and pre and post-processors in Visual Basic 6.0 for a Windows environment. Finally, some examples are presented to check the validity of the employed calculus process

O principal objetivo deste trabalho é apresentar um estudo sobre análise de estrutura tridimensional de edifícios de andares múltiplos considerando a interação de deslocamentos e esforços entre os vários elementos que formam a estrutura, levando-se em consideração a rigidez transversal à flexão das lajes. Isto é realizado através de um modelo que compatibiliza o elemento que discretiza o núcleo com sete graus de liberdade, baseado na teoria da flexo-torção de Vlassov, com o restante da estrutura tridimensional de edifícios de andares múltiplos formada pelos núcleos, pilares, vigas e lajes. Os elementos finitos de placa adotados na discretização do pavimento, responsáveis pela consideração da rigidez transversal das lajes na análise do edifício são o DKT (Discrete Kirchhoff Theory) e DST (Discrete Shear Theory). Para os pilares e os núcleos o equilíbrio de forças é verificado na sua posição deformada, ou como é conhecido da literatura técnica, análise em teoria de 2ª ordem, considerando a não linearidade geométrica. Para o cálculo dos esforços e deslocamentos na estrutura são aplicadas as técnicas de subestruturação em série e paralelo na matriz de rigidez global da estrutura. Elaborou-se um programa de computador para o processo de cálculo, utilizando a linguagem computacional Fortran Power Station 90 e pré e pós processadores em Visual Basic 6.0 para ambiente Windows. Finalmente são apresentados alguns exemplos para comprovar a validade do processo de cálculo utilizado / The main aim of this work is to apresent a study about analysis of three-dimentional structures of multistory buildings considering the interaction of displacements and stresses of the elements of the structures, with the influence of the transverse bending stiffness of slabs. The plate finite elements adopted in floor discretization, responsible for considering the bending stiffness contribution of slabs in the analysis of buildings, are the DKT (Discrete Kirchhoff Theory) and the DST (Discrete Shear Theory). For columns and core walls the forces equilibrium is verified for the columns in their deformed position, which is known in the technical literature as second order analysis, considering the geometric non-linearity. The techniques of serial and parallel analyses of substructures are applied to the global stiffness matrix for the calculus of forces and displacements in the structure. A computer program was developed for the calculation process, using the computer language Fortran Power Station 90 and pre and post-processors in Visual Basic 6.0 for a Windows environment. Finally, some examples are presented to check the validity of the employed calculus process