Naslov
Calculation models of three layered "sandwich" panels

Autori
Sigmund, Vladimir ; Sigmund, Darko ; Zovkić, Jurko ;

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
4th International Congress of Croatian Society of Mecahnics / Franjo, Matejiček - Osijek : Hrvatsko društvo za mehaniku (HDM), 2003, 140-148

Skup
4th International Congress of Croatian Society of Mecahnics

Mjesto i datum
Bizovac, Hrvatska, 18.09.2003. - 20.09.2003

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
r/c sandwich panels; experimental tests; nonlinear and linear analysis; design

Sažetak
The "TVD process" has been developed for cheaper and faster building, reduction in required number of different operations, combination and integration of several building phases, lowering of montage and transport costs and lowering of energy costs in a finished building. Basic building element in the process is the "TVD thermo-panel" that has two spaced reinforcement meshes ade-quately connected with an insulating Polystyrene foam in-between thus forming a space truss. Its construction is simple and does not require high-energy consumption as it is made of standardized materials. Thermal element, held in place with the space truss, serves as a caisson for spraying of concrete and eliminates the need of formworks. The sandwich walls are completed &#8222 ; in-situ&#8220 ; by spraying of concrete in several layers. Resulting TVD house is purely monolithic structure with in-terconnected walls and slabs that unite load carrying, energy conservation and sound insulation functions. Thickness of the finished insulated walls varies depending on its use (bearing and non-bearing outer- and inner-walls, slabs and base plate). composite &#8220 ; sandwich&#8221 ; walls are concrete withes spaced by the insulation in-between. Characteristic loading situations are: axial vertical loading, eccentric vertical loading, in-plane shear loading and wind lateral loading. 2. Experimental testing The experimental tests were needed for studying of the achieved composite action and behavior of the &#8220 ; sandwich&#8221 ; walls under various loading situations. Known problematical areas are in mate-rial quality and characteristics and in achieved composite action of the finished wall. Sprayed con-crete usually has about 20% of voids, has lower modulus of elasticity (40%-70% of the regular concrete with bigger value perpendicular to the spraying direction). "Sandwich" wall has small compressive area and is not suitable for concentrated loadings, problematical shear transfer among the withes, etc. Tested were homogeneous and composite short walls under axial loading and long &#8220 ; sandwich&#8221 ; panels, under axial loading and moment, lateral and in plane loading. Their results are shortly presented here. Table 1 Basic geometrical and material characteristics of the tested model walls 3. Analytical modeling of the "sandwich" walls Modeling of the experimental results by nonlinear mathematical models proved to be complicated as many parameters influenced the results. It was possible to simulate observed behavior by adjust-ing parameters in various manner although some of them had no physical meaning. Optimal and most logical combination of parameters has been chosen for further behavior and close to failure analysis. As nonlinear modeling is unsuitable for design purposes, proposed is the use of uniform concrete sections with higher safety factors. Modifications of analytical formulas were based on the results of experiments and non-linear analysis.

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo

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