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2 2015

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Untypical design solution of prestressed concrete large span slabs

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Szydłowski R. , Smaga A.

Very often is necessary to use large spaces without supports in low floors in designed building where the construction system of the higher levels is completely different. In realized design for hotel building the authors of this paper have proposed prestressed structure made up two slabs and concrete walls as a I-beam web. It was formed the structure similar to box-section bridge beam. In this paper are presented and discussed the designing assumptions, parameters, the static and strength analysis results and the structure detailing. Based on the obtained results and experience from design process the conclusions was drawn.

Research of forces changes in tendons of roof under the sound-wave influence

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Sieńko R. , Szydłowski R.

The article presents the results of tests, aimed for determining the influence of the acoustic wave, generated in the performance and sport hall, on the changes of forces in the tendons elements of the roof. The measurements have been realized in the existing object, build in the sixties of the 20th century, by simulating the actual acoustic influence with use of loudspeaker system at various sound intensity levels and wave lengths.