181 At the old Philipssite in Leuven a great project for sports accommodation was planned for several years. The building should contain a multifunctional hall for sports, a swimming pool and facilities for fitness, judo, meeting rooms, … The design was based on an oval ground floor with a rectangular central part with cafeteria, circulation space (staircases, elevators), rest rooms, a kitchen and other technical rooms. This central part divides the oval base in half: one half is dedicated to swimming, as well recreational (wild water course, pool for children, jacuzzi, ..) as for competition, with side activities like fitness, sports practice and dining. The second half is totally dedicated to the multifunctional hall where several (inter)national sport competitions can take place and where about 3 000 people can be seated. Structurally seen the central block is constructed as a stiff concrete core, while the rest of the building is existing of concrete columns (and some concrete walls) with a rather lightweight roof structure: mostly laminated wooden beams but because of the wide span and the limited constructional height a steel truss over the hall was designed. This steel truss needed to be calculated for stability by software that can give answers to the following questions: • Which steel sections have to be used to build a sufficient frame, and is an enhanced steel quality needed to maintain the (limited) truss height and still be economical? • What is the maximum possible deflection and following: what initial negative deflection does the structure need to be given to guarantee the officially needed height under the trusses in the hall? What will be the horizontal transposition at the ‘sliding’ support when the truss reaches its maximum deflection, so the suitable support apparatus can be determined? The fixed specifications for these steel trusses were : • Total span: 60 m • Maximum constructional height: 2,5 m • Loadings: self weight roof (30 kg/m²), sprinkler (10 kg/m²), acoustic ceiling when needed (60 kg/m²), snow/mobile loads (40 kg/m²) With these specifications the truss was analysed with the ESA-Prima Win software with the following results: the most economical solution (taken into account the steel stresses, including buckling) seemed to be that the upper beam and the lower beam were constructed with improved steel quality S 355 and that an HPsection will be used. The vertical calculated deflection was 29 cm under full load and 22,5 cm under permanent loading so a negative deflection of 30 cm was chosen for the construction of the truss. For the ‘sliding’ support in ESA-Prima Win was determined that a horizontal deformation of almost 3 cm should be possible. Roof span - sports complex A new building for sports accommodation was build at the old Philips-site in Leuven. For the longest roof trusses (span 60 m) above the playing fields the ESA-Prima Win software was used to design the most economical steel construction. The limited truss height and the possible deformations, the vertical deflection as well as the horizontal displacement, were taken into account. Roof span - sports complex - Leuven
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