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Tall timber buildings are of growing interest worldwide and also in the Netherlands. With the introduction of CLT, higher timber buildings are possible compared to traditional timber frame housing. Tall timber buildings can be made as modular buildings or as buildings with a CLT or concrete core and a timber wall/column-floor system that can contribute to the overall stability. In this paper, master student thesis projects dealing with various aspects of timber highrise buildings are presented. These include the possibilities of using 3D-modules in high-rise buildings, design aspects of differential vertical shortening, parametric design, as well as wind-induced behaviour. For tall timber buildings specific aspects as the influence of the connections on the stability and comfort (accelerations), and the necessity of performing a phased analysis to account for the different creep behaviour of timber and concrete. When this is done properly, tall timber buildings can be designed with various structural appearances, fulfilling the requirements and the wishes of architects and users. The raised technical questions have been incorporated in the teaching program of Delft University of Technology and formed the basis for the master thesis projects presented in this paper., Accepted Author Manuscript, Bio-based Structures & Materials

Tall timber buildings are of growing interest worldwide and also in the Netherlands. With the introduction of CLT, higher timber buildings are possible compared to traditional timber frame housing. Tall timber buildings can be made as modular buildings or as buildings with a CLT or concrete core and a timber wall/column-floor system that can contribute to the overall stability. In this paper, master student thesis projects dealing with various aspects of timber highrise buildings are presented. These include the possibilities of using 3D-modules in high-rise buildings, design aspects of differential vertical shortening, parametric design, as well as wind-induced behaviour. For tall timber buildings specific aspects as the influence of the connections on the stability and comfort (accelerations), and the necessity of performing a phased analysis to account for the different creep behaviour of timber and concrete. When this is done properly, tall timber buildings can be designed with various structural appearances, fulfilling the requirements and the wishes of architects and users. The raised technical questions have been incorporated in the teaching program of Delft University of Technology and formed the basis for the master thesis projects presented in this paper., Accepted Author Manuscript, Bio-based Structures & Materials

The demand for sustainable high-rise buildings is growing. Such sustainable high-rise could be realized by the use of mass timber for the structural design instead of more conventional building materials such as steel and concrete. Timber is a renewable resource which can be CO2 neutral if reforestation takes place to close its carbon cycle. In addition, the light-weight of timber reduces the loads on the foundation, and the timber could be used as an architectural feature as well. The height boundaries for tall timber buildings are currently extending, as illustrated by the ongoing realization of a 70 metres tall timber building in Amsterdam. However, the light-weight of timber make tall timber buildings prone to dynamic wind loading. In addition, the current trend to design slender high-rise further increases the wind-induced dynamic response of the building. In this thesis, the technical feasibility of a super tall hybrid wood-concrete building was evaluated and its wind-induced dynamic behaviour was optimized. To this end a 300m tall building of timber and concrete was designed for construction in the city-centre of Rotterdam, The Netherlands. Due to the absence of seismic activity in the area, wind loading was identified as the governing parameter for lateral stability design. The structural design was therefore optimized to satisfy serviceability criteria for lateral drift and occupant comfort. Based on these requirements, the structure was designed as a reinforced concrete core surrounded by a glued-laminated timber (GLT) frame and floor slabs consisting of a cross-laminated timber (CLT) panel with a thin concrete top layer. Lateral stability was ensured by an outrigger/belt-truss system at three levels, resulting in a significant increase of the global stiffness in the structure, and in a reduction of the maximum lateral inter-storey drift by a factor two. In order to fully design a 300m tall wood-concrete hybrid building, desi

The demand for sustainable high-rise buildings is growing. Such sustainable high-rise could be realized by the use of mass timber for the structural design instead of more conventional building materials such as steel and concrete. Timber is a renewable resource which can be CO2 neutral if reforestation takes place to close its carbon cycle. In addition, the light-weight of timber reduces the loads on the foundation, and the timber could be used as an architectural feature as well. The height boundaries for tall timber buildings are currently extending, as illustrated by the ongoing realization of a 70 metres tall timber building in Amsterdam. However, the light-weight of timber make tall timber buildings prone to dynamic wind loading. In addition, the current trend to design slender high-rise further increases the wind-induced dynamic response of the building. In this thesis, the technical feasibility of a super tall hybrid wood-concrete building was evaluated and its wind-induced dynamic behaviour was optimized. To this end a 300m tall building of timber and concrete was designed for construction in the city-centre of Rotterdam, The Netherlands. Due to the absence of seismic activity in the area, wind loading was identified as the governing parameter for lateral stability design. The structural design was therefore optimized to satisfy serviceability criteria for lateral drift and occupant comfort. Based on these requirements, the structure was designed as a reinforced concrete core surrounded by a glued-laminated timber (GLT) frame and floor slabs consisting of a cross-laminated timber (CLT) panel with a thin concrete top layer. Lateral stability was ensured by an outrigger/belt-truss system at three levels, resulting in a significant increase of the global stiffness in the structure, and in a reduction of the maximum lateral inter-storey drift by a factor two. In order to fully design a 300m tall wood-concrete hybrid building, desi