There are a number of building structures in service in Czech Republic at present time where the main structural element is a cable or a suspender, for example: cable roofs, cable-stayed bridges and bridges with external prestressing cables. Knowing the value of cable tensile force is important for appreciation of reliability both during their construction and their operation. The vibration frequency method can be used for indirect estimation of the cable tensile force using the measured natural frequencies. The vibration frequency method is very suitable for experiments done only one time or occasionally. This method provides results precise enough for suitable setting of experiment and evaluation method. The vibration frequency method is often used in practice because it provides an efficient, cheap and relatively easy way to determine the cable forces and a standard measuring line for dynamic experiments can be used. The paper will present the results of an experiment carried out on the roof structure of the Administrative Center Amazon Court .The results of the experiment show that production tolerances and mounting method can significantly influence the stresses in statically indeterminate load bearing structure with cables. Therefore, it is important to verify forces in cables experimentally in these structures and it is also suitable to monitor forces during their service life.
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