Zobrazeno 1 - 10
of 28
pro vyhledávání: '"Romanas Karkauskas"'
Autor:
Liudas Liepa, Romanas Karkauskas
Publikováno v:
Mokslas: Lietuvos Ateitis, Vol 4, Iss 4 (2012)
The article discusses an algorithm for optimizing and analyzing steel inelastic frame structures evaluating geometrical nonlinearity. The structure is discretized applying bar type finite elements that can be tensioned, compressed or bended. For such
Externí odkaz:
https://doaj.org/article/dec6d8c01efb491ca2b9350d807d2f67
Autor:
Romanas Karkauskas, Michail Popov
Publikováno v:
Journal of Civil Engineering and Management, Vol 17, Iss 4 (2011)
The establishment of the real stress-strain state of the structure is one of the most important problems for designing and undertaking the reconstruction of building constructions as well as making calculations for the purpose of optimizing cross-sec
Externí odkaz:
https://doaj.org/article/b5e18b51943549f08949e95cda694aad
Autor:
Romanas Karkauskas, Michail Popov
Publikováno v:
Mokslas: Lietuvos Ateitis, Vol 1, Iss 5 (2011)
The expressions of the finite element method tangent stiffness matrix of geometrically nonlinear constructions are not fully presented in publications. The matrixes of small displacements stiffness are usually presented only. To solve various problem
Externí odkaz:
https://doaj.org/article/0411e14a0c4c436ea5bcfbd704d41ab0
Autor:
Romanas Karkauskas, Michail Popov
Publikováno v:
Engineering Structures and Technologies, Vol 1, Iss 1 (2009)
The purpose of the problem of optimization is introducing a project on the structure satisfying the limit requirements of the safety and usability conditions of the various eff ects of external actions. It can be provided by disposing comprehensive i
Externí odkaz:
https://doaj.org/article/1eaa07a5e62e402f93c5ab60effd5522
Autor:
Romanas Karkauskas
Publikováno v:
Journal of Civil Engineering and Management, Vol 13, Iss 3 (2007)
A mathematical model and calculation algorithm for geometrically non‐linear structure cross‐sectional optimisation are developed. Inelastic strains in the state prior to plastic collapse are evaluated. The algorithm is obtained combining the extr
Externí odkaz:
https://doaj.org/article/29b6fb6044a64b0eb7fb8e4abb3eec1b
Autor:
Romanas Karkauskas, Juozas Nagevičius
Publikováno v:
Technological and Economic Development of Economy, Vol 13, Iss 1 (2007)
A developed mathematical model and calculation algorithm for steel frame cross‐sectional optimisation taking into account inelastic strains and maintenance requirements are presented. An evaluation of dissipative features when employing inelastic s
Externí odkaz:
https://doaj.org/article/9f7426069f4b40b5b92681f8200ca8cd
Autor:
Arnoldas Norkus, Romanas Karkauskas
Publikováno v:
Technological and Economic Development of Economy, Vol 11, Iss 4 (2005)
The aim of the article is to present a developed algorithm of a stepped structural optimization method in the case of load combinations. The presentation of external loading via load combinations usually is employed in design codes. The pinâ€joint
Externí odkaz:
https://doaj.org/article/fd66f27fba3b44f5b971f800d93109ba
Autor:
Arnoldas Norkus, Romanas Karkauskas
Publikováno v:
Journal of Civil Engineering and Management, Vol 10, Iss 3 (2004)
An actual design of lightâ€weight structures must evaluate strength, stiffness and stability constraints as well as the nature of external loading. A designed structure must satisfy optimality and safety criterions per prescribed maintenance perio
Externí odkaz:
https://doaj.org/article/0f52491a8a1f45d589ecd6748da081b3
Autor:
Romanas Karkauskas
Publikováno v:
Journal of Civil Engineering and Management, Vol 10, Iss 2 (2004)
An actual structural design, especially that of lightweight structures, must evaluate strength, stiffness and stability constraints. A designed structure must satisfy optimality criteria. One faces known difficulties when trying to implement several
Externí odkaz:
https://doaj.org/article/e523457784f74d109dff23971c5fd399
Autor:
Romanas Karkauskas
Publikováno v:
Journal of Civil Engineering and Management, Vol 3, Iss 12 (1997)
Nagrinėjame įtempčių ir deformacijų būsenos (ĮDB) nustatymą plokščiose strypinėse sistemose, kai poslinkiai dideli, o deformacijos mažos. Šiuo atveju pusiausvyros lygtys sudaromos nepaisant strypų deformacijų. Geometriškai netiesin
Externí odkaz:
https://doaj.org/article/1a4ffd77cb06411794c01172fd3146bd