Abstract
The effects of prestressing forces on a reinforced concrete frame are shown in the paper. The structure is a statically indeterminate frame with two fixed supports. The load is due to tendon prestressing with Nk = 600 kN and due to self-weight of columns and beam. The columns height is 6.00 m and the beam span is 20.00 m. Effects of prestressing can be replaced by an external equivalent load. Calculations are performed by the force method, by the direct stiffness method and using the 'Tower' software. The rotational restraints are released at fixed supports and the restraint moments are calculated by the force method. The direct stiffness method uses the members' stiffness relations for computing member forces and displacements in structures. The unknown nodal rotations and translations are obtained by solving a system of equations. The considered tendon profile is without eccentricity above the columns. 'Tower 7' is software for static and dynamic structural analysis and for design of concrete elements. It enables overall structural analysis of plane and three-dimensional structures. Automated, integrated tools allow fast and reliable design or the verification of the results obtained by standard methods. Version 7 is a professional tool with high performance. Three different calculation methods have given close results, with minor differences.
Highlights
Metod proračuna metodom sila i metodom deformacija ostaje u senci savremenog projektovanja i razvoja savremenih softvera
Datum konačnog prihvatanja članka za objavljivanje/ Paper accepted for publishing on: 02. 03. 2014
Summary
Posmatrani sistem je armiranobetonski ram (AB ram) sa dva uklještenja. Konstrukcija i opterećenje su simetrični (Curić, et al, 2010, pp.). Na njega deluje opterećenje prednaprezanjem kablom silom Nk=600 kN, kao i sopstveno opterećenje. Opterećenje od sopstvene težine elemenata je od rigle i stuba. Koncentrisanim skretnim silama u pravcu simetrale ugla na mestu oštrog preloma trase kabla, i. Podeljenim skretnim opterećenjem u pravcu centra krivine na delu kabla u krivini. Skretne sile javljaju se duž celog kabla, jer je reč o paraboli, pa ih izražavamo kao sile koje deluju na jedinicu dužine, a ugao skretanja i dužina odsečka su beskonačno mali. Ovaj sistem je usvojen bez ekscentriciteta nad stubovima da bi se videlo ponašanje sistema kada nije tipično i optimalno rešenje, kako bi se videla i dokazala njegova funkcionalnost, tj. Ovaj sistem je usvojen bez ekscentriciteta nad stubovima da bi se videlo ponašanje sistema kada nije tipično i optimalno rešenje, kako bi se videla i dokazala njegova funkcionalnost, tj. nefunkcionalnost
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