PROSTORNO- POVRŠINSKE REŠETKE

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1 VI Predavanje Dr Dragan Kostić, v.prof. PROSTORNO- POVRŠINSKE REŠETKE II deo 2 PROSTORNO POVRŠINSKE REŠETKE II deo PREGLED PRIMENJIVANIH SISTEMA U SVETU www.gaf.ni.ac.rs/arhkonstr/ 1

3 Patentirani sistemi Posle 1950. a naročito izmedju 1960. I 1970. neprekidno se usavršavaju, do danas. primenom CAD projektovanja primenom CAM izrade Odgovarajućim načinom montaže 4 Patentirani sistemi U početku, ovi sistemi izradjivani su na klasičan način, spajanjem štapova u čvorovima, pomoću zavrtnjeva, kasnije zavarivanjem Ovakvo povezivanje štapova je nepraktično, jer dovodi do niza teškoća pri izradi zbog preciznosti. Kasnije se javljaju specijalni elementi - prostorne spojnice za spajanje štapova u njima, a koje su najosetljiviji konstrukcijski problem ovih sistema 2

Čvorovi patentiranih sistema Ključni element sistema je čvor, obezbedjuje statički i deformacijski neoslabljeno spajanje dovoljnog broja štapova iz različitih pravaca treba da se približi idealnom modelu zgloba 5 Tipovi prostornih spojnica i čvorova MERO, UNISTRUT, SPACE DECK, TRIODETIK, OKTAPLATTE, UNIBAT, NODUS MARHI, GOŠA i drugi sistemi 6 3

7 MERO pojavio na tržištu (1942.) Osnovni čvor MERO sistema je puna, kovana, tokarena čelična kugla Tipizirane kugle od φ50mm do φ350mm 8 MERO Štap je cev kružnog preseka. Tipski štapovi su φ30/1.6mm do φ219.1/8.8mm Na krajevima je zavaren konusni element, sa čaurom i zavrtnjem 4

MERO + sistemi PRK 9 KK-čvor ima mogućnost povezivanja 18 štapova u prostoru MERO KK čvor 10 KK-Ball Node System load applied to the nodes single- or multi-layer each node has up to 18 threaded holes as pin jointed connections gives greatest freedom in design 5

11 MERO KK čvor MERO NK čvor 12 NK-Bowl Node System double-layer structure pin-jointed connection to the nodes lower chord as ball node system plane or vurved surfaces average to wide-span structure 6

MERO ZK čvor 13 ZK-Cylinder Node System single-layer structure in triangular and/or trapezoidal surface geometry bend resistant connection i.g. for curved surfaces of average span structures small to middle spans cladding elements fixed directity on members MERO TK čvor 14 TK-Disc Node System single-layer system in triangular surface geometry pin-jointed connection to the nodes curved surfaces of small to average span structures 7

MERO BK čvor 15 BK-Block Node System single- or multi-layer structure single bolted connections sharp changes in inclination of roof i.e. shed MERO BK čvor 16 Double-Node single layer structures, with high, slender sections bending-stiff, pinjointed connections plan and vurved freeformed grid-shells with targe warpage 8

17 MERO Visina i raster za dimenzionzionisanje PRS MERO KK i NK MERO-DE 18 MERO-DE predstavlja posebnu vrstu konstrukcije koja se proizvodi u tačno definisanim dimenzijama (modularna konstrukcija). Koristi se za raspone do 30m, 9

19 JUNISTRAT (UNISTRUT) pojavio se 1955.godine, pod patentnim nazivom UNISTRUT korporacije Attwood Development Co. of Muchigan (SAD). Raspon do 30m 20 TRIODETIC 1955.godine firma Fentimen Co. Ltd iz Kanade aluminijumska ili čelična glavčina sa nazubljenim procepima u potrebnim pravcima 10

SPACE DECK 21 1958.godine u Velikoj Britaniji modularna konstrukcija sa najčešće primenjivanim rasterom a=1,20m, raspona do 30m SPACE-GRID 22 prefabrikovane piramide, koje se koriste za formiranje krovnih ravni ili medjuspratnih konstrukcija Gornji pojas formira se od metalnih panela fabrika Butler Manufacturing Co. (SAD) 11

23 OKTAPLATTE 1960.godine. Proizvodjač je firma Mannesmann AG Štapovi su cevasti, Zavareni za šuplje čelične kugle. Kugle su ojačane u sredini jednim kružnim diskom 24 UNIBAT Stephane du Chateau (Francuska) i H.R.Teylor- (V.Britanija) osnovni element oblikovana piramida (montažna) Dvosmerni ukršteni sistem 12

UNIBAT 25 Rastojanje izmedju štapova gornjeg pojasa predstavlja raster ili modul a=120cm, za visinu rešetke h=38cm ili 60cm Za raster a=300cm visina je h=150cm. Moskovski ARHitektonski Institut 26 dvosmerni ortogonalni sistem ili trosmerni sistem sa dijagonalnim štapovima pod uglom od 45 Najširu primenu ovaj sistem je našao za pokrivanje jednospratnih industrijskih objekata koji se moraju izdeliti na sekcije površine 30m x 30m ili 36m x 36m. 13

MARHI 27 Modularna PRK Raster je 1,5m ili 2,0m ili 3,0m dok je visina PRS 1,060m ili 1,414m ili 2,121m. Rasponi 18m, 21m ili 24m NODUS 28 1971. Od strane British Steel Corporation Spojnica je formirana od dve livene poluškoljke 14

GOŠA Smedervska Palanka 29 ExpoCentar u Moskvi 1981. Autor čvora je V.Sjekloća Raspon 20m do 80m Dvoslojna, visine 1,5m do 3,0m Najprimenjivaniji PRS u svetu 30 još uvek se ne može govoriti o optimalnom sistemu PRK 15

31 PRK...? 16