Over the last few years a new bridge construction method, the so called "balanced lift method", has been developed at the Institute for Structural Engineering at Vienna University of Technology. In the summer of 2010 a large scale experiment on the balanced lift method was performed in Gars am Kamp (Austria) to prove the feasibility of this method. The span of the bridge amounted to about 50 m. Moreover the utilization of thin-walled precast concrete parts in bridge-building has been tested during this experiment. In addition to the balanced lift method experiment, a 30 m long beam was built, also using precast concrete parts. The cross section of the beam had a thin walled U-shape profile. The side walls had a width of 7 cm and a height of 144 cm. The bottom plate had a thickness of 20 cm and a width of 70 cm. The production of these parts took place in the weather-protected factory building. Only the foundation was built at the construction site and the precast parts were assembled on site. The U-shaped beam was prestressed to 5300 kN and the tray was filled with self compacting concrete. The advantage of this precast parts is the easy handling during transport and assembling because of the low self-weight. It was assumed that stress from the precast parts ows to the filling concrete due to its creep behaviour. This thesis contains the results of the measurement taken by a stress-measuring extensometer which analyses the long-term behaviour of the beam. In addition, a FEM (finite element method)-simulation was carried out. The comparison of the results of the measurements on the one hand and the simulation on the other hand allowed us to draw valuable conclusions on the creep behaviour.