147 Short list Client: Hevo bouwmanagement Architect: Liag architecten Construction company: Teerenstra bouw Floor area ground floor: 400 m2 (auditorium / media room) First floor height: 6,5 m General The project includes a renovation and an extension of a college in Beverwijk (the Netherlands). In the centre of the existing buildings a new auditorium and media room have been designed. The concept of the new auditorium and media room will be further explained below. In consultation with the architect, the new building has been designed in a steel structure with the shape of trees. The reason for this typical design for the structure is the demanded free space on the ground floor in combination with a light roof structure. The steel structure of the trees will be visible in the final situation. In the middle section between the trees a ceiling is applied under the first floor to hide the installation facilities. On the ground floor there are four trunks that carry the first floor and the roof. On the first floor there are also four trunks with each four twigs. On each side of the first floor there are two trunks with two twigs. The trunks on the first floor are positioned on the twigs of the ground floor. The geometry of the trees and the position of the trunks is optimised by making the twigs of the trees balance each other. Because of this the bending moment in the trunk by permanent loads was minimised. However, a bending moment will occur in the connection between the twigs and the trunk because of the variable loads on the floor and loading / unloading combinations. The roof consists of a light steel plate supported by beams in two directions. The stability of the roof level is realised by the beams and the cold formed steel plate. In two directions the beams are supported by the trees with a distance of four metres. The first floor is designed as a hollow core floor supported by the steel structure. The stability of this level is realised by a cast-in-place concrete topping on the hollow core slab. On this floor there will be a media centre with mainly computers for the students. In some parts under the first floor steel beams extend out of the concrete floor, in these parts a ceiling has been placed. In the part without a ceiling the floor beams are integrated in the concrete floor. Because of the geometry and the dimensions of the trees, some of the twigs are welded on the trunk in the factory and then they are transported; on the construction site the other twigs are welded on the trunk. For the horizontal stability the structure is supported by the main building. It is not necessary to protect the whole steel structure against fire. In case of an emergency an escaping route can be found through the main building. The round hollow section columns on the ground floor are filled with sand to reduce the possible occurrence of noises. This project is a typical project for a three-dimensional calculation. Many projects can be designed and calculated with two-dimensional calculations but for this project a three-dimensional calculation has to be performed because of the complexity of the structure and the loads on the floor and on the structure. Aula - Multimedia library of the Kennemer College The expansion of a school is designed in a steel structure based on a tree structure. On the ground floor occur four trunks with each four twigs carrying the first floor as well as the trunks on the first floor. Special attention with regard to the calculation was given to the variable loadings on the floor. In the design progress, in consulting with the architect, the position of the trunks was optimised so the bending moment in the trunks was minimised. With a three dimensional calculation the whole structure is designed. The roof is designed in a light steel plate resulting in a slender steel structure. Aula mediatheek Kennemer college
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