Estimation of stiffness and energy dissipation for the models of reinforced-concrete composite slabs based on the investigations of statically loaded slabs

• Autorzy: Gromysz K.
• Języki publikacji: EN

Abstrakty

EN

Reinforced concrete composite slab consists of a thin prefabricated slab in which span reinforcement is located and of concrete joined with the slab, with such concrete being laid on site. The existence of a joint of two concretes in such floors is interpreted as introducing a contact layer into a monolithic slab. In the paper parameters of two models are estimated. The first is a model of a contact layer and the second is a model of a composite slab with a single degree of freedom. The models consider that the contact has elastic properties and inelastic properties causing energy dissipation. Experimental investigations are discussed further based on which the parameters values of the contact layer model were determined. Delamination was experienced for the slabs characterised by low contact layer stiffness after applying a maximum load. In addition, the strains of a contact layer having low stiffness are accompanied by lower energy dissipation than of a layer with high stiffness. The smaller stiffness of composite floors, as compared to monolithic floors, occurs as a consequence of the existence of a joint. Such decrease for a composite slab is interpreted in the model with a single degree of freedom as the serial connection of stiffness of a monolithic slab and an element considering the existence of a contact layer. The stiffness of an element considering the existence of a contact layer decreases along with a load, and the elements corresponding to the higher stiffness of the contact layer are characterised by higher energy dissipation. The aforementioned results of the investigations confirm the assumptions of the contact layer model and a composite slab model with a single degree of freedom. The findings made represent a basis for establishing a method of evaluating the condition of a joint in composite slabs according to statistical investigations.

Słowa kluczowe

EN

reinforced concrete; composite slab; hysteresis loop; energy dissipation; stiffness

PL

płyta żelbetowa; płyta kompozytowa; pętla histerezy; rozpraszanie energii; sztywność

• Wydawca: Komitet Inżynierii Lądowej i Wodnej PAN ; Politechnika Warszawska, Wydział Inżynierii Lądowej
• Czasopismo: Archives of Civil Engineering
• Rocznik: 2012
• Tom: Vol. 58, nr 3
• Strony: 259--292
• Opis fizyczny: Bibliogr. 7 poz., il.

Twórcy

autor

Gromysz K.

• Silesian University of Technology, Department of Building Structures, ul. Akademicka 5, 44-100 Gliwice,

Bibliografia

• 1. A. Cholewicki. Building structures composed of precast units (in Polish), Wydawnictwa Instytutu Techniki Budowlanej. Warszawa 2001.
• 2. W. Starosolski, Prefabricated and composite floors. General floors design principles. Construction Review (in Polish), Przegląd Budowlany, 5, 22-24, 2003.
• 3. K. Gromysz, Longitudinal Shearing Balancing in Joint Surface of Composite Concrete Slabs (in Polish), Inżynieria i Budownictwo, 3, 141-147, 2010.
• 4. K. Gromysz, Modelling the influence of composite stiffness on energy dissipation in reinforced composite concrete floors, Archives of Civil Engineering, 58, l, 71-96, 2012.
• 5. A. Zbiciak, Numerical analysis of dynamic behaviour of elastoplastic beams. Archives of Civil Engineering, 55, 3, 403-420, 2009.
• 6. S. Goszczyński, J. Ślusarczyk, Relationship M(k) for reinforced concrete subjected to changing loads. Archives of Civil Engineering, 55, l, 65-78, 2009.
• 7. A. Halicka, A study of the stress - strain condition in the interface and support zones of composite structures with shrinking and expansive concretes (in Polish), Wydawnictwo Politechniki Lubelskiej, Lublin 2007.