Adding stories on top of the existing building by using steel structures. Case study: Dillenburgsingel project in Leidschendam

This study intends to develop a design method of adding more stories on existing building by using a case study of construction project in Leidschendam where 9-stories are to be added on existing 6-storey residential building. A low riser building is to be changed into multistory building. The state-of-art of the project was designed by the Engineering office of SmitWesterman and implemented by demolishing a section of the existing building where additional stories were constructed. The initial idea was to add 9-stories on existing 6 stories to form a structure of 15 story-high without demolition. Even though this idea was abandoned during implementation but it was forwarded to the University to make further research and formulate possible design alternatives. This study is about searching a proper alternative to be used when adding storey on existing building by using lightweight materials (steel structures) without demolishing the existing structures, which are not at their maturity time. This is a proper method of changing an existing low riser into a multistory building with minimum waste. Therefore, this technique can be used in highly built environment. In this study, the major issue to be solved is to know how an existing low riser building can be changed into a multistory building. This study would have a significant effect on already built residential areas whereby more homes can be built in extremely limited place without demolishing the existing buildings. The major issues are to know the construction method to be used for this particular project, integration of the old and the new structures and the structural system to be used. This study will only cover the structural design of superstructure and foundation. As the new and old structure serve the same function, their function must be integrated but their structures may not be fully integrated. 1. Integrated design: The capacity of existing building will be checked for both superstructure and foundation. If the existing structure shows to be able to carry some loads acting on new structure, it can be mainly used to help new structure in carrying vertical and lateral loads 2. Separated design: If the capacity of existing structure cannot carry load from additional structure, the new structure will be designed differently from the existing one. 3. Partially integrated: This can be implemented in case the old building presents weakness in some structural aspects. The existing foundation is used at 40% but it cannot be used by the new structure since its weight exceeds the capacity of the existing foundation and it is impossible to add more piles. The super structure was designed to take safely only the design loads; no more floors were considered The existing building is stiff in lateral direction because all its 7 axes are filled with walls. Adding stories on existing building is possible with their function being integrated. However, their structures should be semi-integrated; they should be laterally connected for stability but the routes of vertical forces should be separated; the existing building should be bridged. Therefore, the new structure should have its own foundation; Fundex piles were chosen since they are free from vibration. To minimize the weight and to cover the long spans, steel structures should be used. The old and new structure should have the same shape since the cantilevers bring complications, but in case they are unavoidable continuous beam and columns should be used. In this study, dynamic behavior, influence of new to told foundation, thermal and sound comfort were not covered, they should be undertaken in future studies.

Subject

adding floors on existing building
extending the existing low riser building into a multistory building
adding more stories on existing building

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Student theses

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master thesis

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L.Uwimana_Thesis.pdf

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