Naslov
Structural stability analysis of stadium roof

Autori
Črešnar, Antonio ; Uroš, Mario ; Gidak, Petra

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

Izvornik
Proceedings of the IASS Annual Symposium 2019: Form and Force / Lázaro, Carlos ; Bletzinger, Kai-Uwe ; Oñate, Eugenio - Barcelona : International Centre for Numerical Methods in Engineering (CIMNE), 2019, 1405-1411

ISBN
978-84-121101-0-4

Skup
60th Anniversary Symposium of the International Association for Shell and Spatial Structures ; 9th International Conference on Textile Composites and Inflatable Structures (Structural Membranes 2019)

Mjesto i datum
Barcelona, Španjolska, 07.10.2019. - 10.10.2019

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
reticulated shell ; shape optimisation ; stability analysis ; postbuckling behaviour ; extreme imperfection sensitivity

Sažetak
In this paper the stability of single layered reticulated shell stadium roof is analysed. Preliminary structure geometry is obtained by process of structural optimization according to the tension-compression analogy, which is originally developed for the form finding problems of tensile structures. Final coordinates of nodes are defined by solving nonlinear system of equations in the procedure of form finding of tensile structures. System of equations are solved using force density method for gravity loads. The procedure is applied iteratively until equilibrium. With this procedure more optimal distribution of axial forces is obtained while influence of bending moment for vertical load is reduced to minimum. Stability analysis is carried out and postbucklingbehaviour of the shell is observed. Equilibrium paths are obtained by the finite element method considering geometrical and material nonlinearity to determine load capacity of the structure. The bifurcation points are detected and postbuckling equilibrium paths were developed for various imperfections which are assumed in the form of buckling modes and its linear combination. Several values of extreme amplitudes are considered for each imperfection. Finally, the sensitivity diagrams are constructed. The shape of the structure is the result of optimization process and the buckling modes are close to each other. Consequently, postbuckling branches sharply decrease resulting with extreme imperfection sensitivity.

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo

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