“Computational Civil Engineering - "Intersections" International Journal

“Computational Civil Engineering 2005”, International SymposiumIaşi, România, May 27, 2005Designing reticulated space systemsConstantin Jantea 1 , Florin Varlam 11 Prof. Ph. D. eng. “Gh. Asachi” Technical University, IaşiSummaryThe results of static and structural analysis, by means of a computer program, oftwo reticulated space structures made up of metal pipes are being presented.1. INTRODUCTIONReticulated space systems are structures made up of connected bars, either directly,if they are connected by hinges, or by gusset plates, aided by the weld. A system ofbars, spatially developed from the point of view of static analysis is a multiplyindeterminate structure whose solving in various assumptions of loading becomespossible only if we use computer programs. In what follows several aspectsconcerning the computation of two such structures will be made:- Power line poles for night games, Oneşti stadium;- Brine pipe duct over Trotuş river at Oneşti.Of the two structures, the first has not been implemented, while the latter was builtin 1995.2. POWER LINE POLES FOR NIGHT GAMES, ONEŞTI STADIUM2.1. Constructive solutionA pole (Fig. 1) is 40.20 m high considered from the upper surface of its foundation.It is a space structure made up of four branches which are hinge-connected invertical plane by diamond shaped cross studs and additional struts (combinedsystem). Furthermore, on the horizontal, at the strut level, diagonal bars areprovided which form with the struts diaphragms that confer torsional rigidity to thepole. (section 1-1, Fig. 1).The pole is built up of two segments, the bottom one - 20.00 m high, and a variablesection ranging from 3.5× 3.5 m at the base to 1.5× 1.5 m at top, the upper onehaving a height of 20.20 m and a constant section of 1.5× 1.5 m; this way the polebeing subjected in its lower half to the bending moment diagram produced by thehorizontal loads acting upon it (wind loads).