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Analiza tłumienia prędkości fali podłuŜnej w elemencie Ŝelbetowym z zarysowaniem

100%

TEODORCZYK M.

Edukacja-Technika-Informatyka

2012

vol. 3

issue 1

303-308

W pracy przedstawiono wpływ zarysowania na prędkość podłużnych fal akustycznych w elemencie żelbetowym pod obciążeniem. Badania przeprowadzono na belce o wymiarach 120 × 300 × 6300 mm wykonanej w zakładzie prefabrykacji. Pokazano, iż powstawaniu rys towarzyszy spadek prędkości propagacji fal nawet o ponad 50%. Analiza prędkości rozchodzenia się podłużnych fal akustycznych w elementach pod obciążeniem jest perspektywą opracowania metody nieniszczącej oceny stanu technicznego konstrukcji betonowych. Efektem pomiaru jest spadek prędkości fal do pewnego poziomu degradacji materiału.

This paper presents effect of cracks formation on the velocity of longitudinal acoustic waves in reinforced concrete element under load. Experiments were carried out on 120 × 300 × 6300 mm prefabricated beams. It was found, that formation of cracks causes attenuation of elastic wave (acoustic) velocity of over 50%. Hence, analysis of the elastic wave velocity can be used for structures diagnosis. Research will be carried out to develop non-destructive method for evaluation of technical state of reinforced concrete structures, which is based on the of longitudinal wave velocity.

Modernistyczne wiaty i przystanki kolejowe Warszawskiego Węzła Kolejowego. O konieczności ochrony konserwatorskiej

88%

Skalimowski A., Tucholski Z.

Ochrona Zabytków

2010

issue 1-4

73-84

The subject of the article is the history of some of the interesting interwar period constructions, namely the modernist railway platform umbrella roofs and the train station waiting halls of the Warsaw Railway Junction electrified railway lines. In 1933, an agreement was concluded between the Polish State Railways (PKP) and a consortium of British entrepreneurs on the electrification of the suburban railway lines of the Warsaw Railway Junction (to Otwock, Żyrardów and Mińsk Mazowiecki). The completion of this railway investment, one of the most significant in the interwar period, required the redevelopment of the track systems of the electrified lines and the construction of new platforms, umbrella roofs and stations. The design works related to the electrification and redevelopment of the Warsaw Railway Junction lines were conducted by the Polish State Railways Design and Study Bureau in cooperation with the Polish State Railways Warsaw Railway Junction Electrification Bureau and the Regional Directorate of the State Railways in Warsaw, under the supervision of the Ministry of Communication. At the stage of drawing up the concept of the communication system for the electrified lines, experiences of European railway management boards using electrified lines to handle suburban traffic were used to a large extent. In creating the communication system of the electric urban railway, the Polish State Railways Design and Study Bureau based their work largely on the Berlin Stadtschnellbahn (S-Bahn). The author of the concept of track systems and stations, as well as traffic organisation for the electrified railway lines of the Warsaw Railway Junction was Kazimierz Centnerszwer, Eng., a 1927 graduate of the Faculty of Railway Transport Engineering of the Warsaw University of Technology, an employee of the Polish State Railways Design and Study Bureau. Platforms adapted to the new electric rolling stock were designed at the suburban stations of the electrified lines. They were island, bay and side platforms. At the time, the Polish State Railways Design and Study Bureau created a repeatable design of a station/ platform umbrella roof connected to the waiting hall and the ticket office building or office building. Depending on the local conditions, single-pitched umbrella roofs were also built on island platforms and double-pitched ones in the case of cross-platform interchanges. Unfortunately, in spite of the preliminary research having been conducted, the name of the architect who was the author of the project remains unknown. However, the authorship of Arseniusz Romanowicz, Eng., architect, was ruled out beyond doubt. The modernist platform umbrella roofs and waiting halls constitute an extremely interesting example of Polish modernist railway architecture of the 1930s. At the same time, they are a relic of one of the most prominent investments of the interwar period, namely the construction of the cross-city railway line and the electrification of the Warsaw Railway Junction. Their value is especially high in the context of the destruction of all the railway stations in Warsaw (including the modernist Warszawa Główna main railway station) and a considerable part of Warsaw’s railway architecture and infrastructure during the war.

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1 Edukacja-Technika-Informatyka

1 Ochrona Zabytków

1 2012

1 2010

1 Skalimowski A.

1 TEODORCZYK M.

1 Tucholski Z.

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Analiza tłumienia prędkości fali podłuŜnej w elemencie Ŝelbetowym z zarysowaniem

Modernistyczne wiaty i przystanki kolejowe Warszawskiego Węzła Kolejowego. O konieczności ochrony konserwatorskiej