Numerical simulation of stress and strain state induced by shrinkage of concrete in large-size plate

• Autorzy: Dacko M. , Nowak J.
• Języki publikacji: EN

Abstrakty

EN

The paper presents the numerical simulation of the shrinkage effect of concrete aprons. Three types of square aprons with the sides of 5, 10 and 20 mm and of the same thickness were considered. In simulations it was assumed the following properties of concrete: E = 32000 MPa, v = 0.17, p = 2.4e-9t/mm3, at = l 0-5. The shrinkage of concrete has been reported by the homogeneous temperature field in a plate. The plates were located on elastic foundation with stiffness k = 50 MN/m3. The foundation was simulated by using elements of GAP type, which did not transmit the drawings. Introducing the coefficients of rigidity in shear of GAP and the coefficient of friction between the foundation and the plate allowed to analysis the load plate friction forces caused by the shrinkage of concrete. The plate weight was taken into consideration, too. The numerical simulation was performed using the finite element method. Uniform changes in temperature -30° C and -60°C adopted in the analysis correspond to the values of contraction plates 0.3 mm/m and 0.6 mm/m. In practice, regular contraction joints are produced by notching of hardening concrete to a depth of about 1/3 the thickness of plate, for example, in a grid of 5 x 5 m. Studies show that in the case of protection of large-size plates from accidental shrinkage cracks, for example with the use of reinforcement, the stresses caused by the simultaneous change in temperature is not a major threat in slabs of large size.

Słowa kluczowe

EN

airfield; concrete apron; temperature; thermal load; numerical analysis

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2010
• Tom: Vol. 17, No. 1
• Strony: 93--99
• Opis fizyczny: Bibliogr. 6 poz., rys.

Twórcy

autor

Dacko M.

autor

Nowak J.

• Military University of Technology S. Kaliskiego 2 Street, 00-908 Warszawa, Poland tel: [phone], fax: [phone],

Bibliografia

• [1] Dacko, M., Brodzik, R., Numeryczna analiza wpływu obciążeń termicznych na stan przemieszczeń i naprężeń betonowych płyt lotniskowych, Biuletyn WAT, Nr 2, Warszawa 2008.
• [2] Dacko, M., Brodzik, R., Numeryczna analiza betonowych płyt lotniskowych, Zeszyty Naukowe WSOSP 1(9), Dęblin 2006.
• [3] Dacko, M., Brodzik, R., Numeryczna analiza betonowych dyblowanych płyt lotniskowych, Drogownictwo 6, Warszawa 2007.
• [4] Dacko, M., Marszałek, J., Zastosowanie programów NASTRAN do analizy nośności lotniskowych nawierzchni betonowych, Biuletyn WAT, Vol. LIII, Nr 8, Warszawa 2004.
• [5] Szydło, A., Nawierzchnie drogowe z betonu cementowego, Polski Cement Sp. z o.o., Kraków 2004.
• [6] Nita, P., Betonowe nawierzchnie lotniskowe. Teoria i wymiarowanie konstrukcyjne, Wydawnictwo ITWL, Warszawa 2005.