Kinematic method for determining influence function of internal forces in the steel shell of soil-steel bridge

• Autorzy: Machelski C.
• Języki publikacji: EN

Abstrakty

EN

The live loads of soil-steel bridges are vehicles, and their influence on the steel shell is exerted through the roadway surface. To obtain the maximum values of internal forces in the element analyzed it is essential to place the vehicles in an appropriate manner over the structure. The influence surface of the internal forces in the shell can be utilized in this task, with the reference to the level of roadway. In the paper, there are presented the methods which enable the influence functions of internal forces to be obtained by means of kinematic constraint concept. It is based on the imposition of the basic deformation which is suitable for the internal force in the considered element of the system. Further, on the basis of the deformations inside the element the boundary forces are calculated. They are substitute load of nodes of this element in the global model of structure, which represents the influence function of internal force. Practical calculations of influence function are carried out by means of FEM, using the substitute load of nodes of the element. Due to this load, there is created the surface of the vertical displacements of a roadway (corresponding to the direction of external loads) which constitutes also the influence function of internal forces. The algorithm proposed can be applied in any geometrical model, provided that the analyzed element in which the force is to be found is the bar. The model does not require any change of discretization when choosing next element or internal force for the analysis. Simple formulas presented allow the boundary forces to be calculated. They can be used to determine the influence functions of internal forces and normal stresses in the soil-steel bridges.

Słowa kluczowe

PL

siły wewnętrzne; powłoki stalowe; most gruntowo-stalowy

• Wydawca: De Gruyter
• Czasopismo: Studia Geotechnica et Mechanica
• Rocznik: 2010
• Tom: Vol. 32, nr 3
• Strony: 27--40
• Opis fizyczny: Bibliogr. 6 poz.

Twórcy

autor

Machelski C.

• Institute of Civil Engineering, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław

Bibliografia

• [1]MACHELSKI C., MICHALSKI J.B., JANUSZ L., Deformation factors of buried corrugated structures, Journal of the Transportation Research Board, Solid Mechanics, Transportation Research Board of Nationals Academies, Washington D.C., 2009, 70–75.
• [2]PETTERSSON L., Full Scale Tests and Structural Evaluation of Soil Steel Flexible Culverts with Low Height of Cover, Doctoral Thesis in Civil and Architectural Engineering, KTH Stockholm, Sweden, 2007.
• [3]MACHELSKI C., Applications of kinematic method in the influence function of internal forces in the beam structures (in Polish), Zastosowanie metody kinematycznej do wyznaczania funkcji wpływu sił wewnętrznych w układach prętowych, Inżynieria i Budownictwo, 1998, nr 7.
• [4]MACHELSKI C., ANTONISZYN G., Influence of live loads on the soil-steel bridges, Studia Geotechnica et Mechanica, 2004, 3–4, 91–119.
• [5]MACHELSKI C., ANTONISZYN G., Load rate of the circumferential sector of soil-steel bridges structures, Archives of Civil and Mechanical Engineering, 2005, Vol. V, No. 4. 85–102.
• [6]ANTONISZYN G., Soil-steel bridges. Influence of geometrical parameters on internal forces in steel shell (in Polish), Mosty gruntowo-powłokowe. Wpływ ukształtowania obiektu na siły wewnętrzne w stalowej powłoce, MOSTY, 2008, nr 2, 26–35.