Stage Semper Opera House
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Report from the annual report 2017
The opera house ‘Semperoper’ in Dresden is well-known for its opera ball. Since 2006, it regularly takes place in February, with many celebrities from politics, business, science, and culture in attendance. Traditionally, the ball is opened each year with the debutants’ presentation. But in 2017, it was completely different. After extensive reconstruction work on the rehearsal stage in the “Semper Zwei” building, this could not be used as planned for the preparation of the celebration. The special load-bearing capacity requirements of the ceiling structure for such dance events could not be proven. The Otto Mohr Laboratory of the Technische Universität Dresden was given the task to check the dynamic behaviour of the ceilings and to estimate the structural behaviour. To evaluate the available load capacity of the rehearsal stage floor, dynamic characteristic values were determined by in-situ measurement.
Aufbau der Messtechnik in der Küche
For this, the entire measuring technique had to be set up in the kitchen of the “Semper Zwei”. First, the determination of a static reference load case was necessary. This was carried out by loading the ceiling with weights. By measuring the deflection under a static load of the ceiling’s bottom side, a static ceiling stiffness could be derived. For the characterization of the dynamic properties of the ceiling, modal parameters were determined, by a defined impulse excitation of the ceiling. From these values, both the total structural attenuation of the slab and the transfer functions of the entire system could be determined. For the evaluation of different excitation spectra, different load scenarios were imitated. So, it was possible to evaluate the occurring spectral loads as a function of a person’s weight, walking speed, number of people,and floor construction. The challenge was also to capture the transmission behaviour of the special stage floor construction suitably since the approach of measuring the properties of the ceiling might not be sufficient.
By the investigations, it could be shown that due to the usual demands of a dance event on the ceiling, no damage is to be expected and the required carrying capacity is provided.