PSI - Issue 28

Mirjana Jelic et al. / Procedia Structural Integrity 28 (2020) 1833–1838 Mirjana Jeli ć , Aleksandar Sedmak/ Structural Integrity Procedia 00 (2019) 000–000

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The Hall 1 is the most prominent example of the application of concrete pre-stressing patented system IMS-Žeželj which was fully designed and developed by Branko Žeželj (1910-1995) within Institute for material testing of materials IMS in Belgrade. The pre-stressing patented system IMS-Žeželj has been worldwide patented and accepted as one out of three pioneering concrete pre-stressing technologies and Branko Žeželj is remembered to be one of the greatest and most active constructors in the world (Muravljov, 2010; Jelić, 2017a,b). The Hall got the status of the monument of culture in 2009 by the decree of the Government of the Republic of Serbia. At the time when the Hall 1 has been designed a calculation of the Dome construction system could be made only for the symmetrical load. Therefore for the estimation of the deflections of the Dome under unsymmetrical load, the Dome test model on a reduced scale 1:10 has been made out of the same material (Fig. 2). In this paper the structural integrity of the Dome system, using Finite element software SAP2000, is compared with the deflections measured on the Dome test model on a reduced scale 1:10. The paper contributes to understanding of the ribbed type Dome pre-stressed free-standing structures. In that respect, in part 2. of the paper the Dome system structural elements, static data with the deflections measured on the Dome test model on a reduced scale 1:10, and geometric parameters are presented, while in part 3 deflections of the Dome based on finite element analysis are presented and compared with the deflections measured on the Dome test model on a reduced scale 1:10.

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Fig. 1. (a) Hall 1 of the Belgrade Fair, (b) Inside the Hall 1 (Žeželj, 1960)

Fig.2. Branko Žeželj in front of the model of the Dome of Hall 1 of the Belgrade Fair (1:10) (Muravljov, 2010)

2. The Dome system 2.1 Structural elements

The Dome system consists of following structures: (i) central circular cap of reinforced concrete, which has diameter of 27 m; (ii) the 80 I cross section precast reinforced concrete semi-arched ribs, each 35 m long and 34 tons weight, which supports (i); (iii) the pre-stressed concrete great support hollow ring with diameter of 94 m and trapezoid cross section, which supports (ii) (Fig. 3). Between the structure (i) and the structure (iii) three intermediate rings stiffen the ribs of the Dome laterally. The structure (iii) is supported by eight pairs of inclined columns in “V” form. The structure (i) of the Dome comprises two slabs of reinforced concrete 8 cm thick and 80 cm apart, which are stiffened by three circular and eight radial ribs between the slabs. The spaces between the ribs are filled with curved lightweight concrete slabs which contain circular roof lights (Fig. 3) (Žeželj, 1960). The support columns of the structure (iii) of the Dome lies on a circle of diameter of 106 meters (Fig. 3). The foundation of the Hall 1 was made on 35 „Frankie“ pre-stressed concrete piles, above which is the supporting pyramid of the V shape column (Fig.3) (Žeželj, 1957; Petrović, 1968).