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  • Author or Editor: Krisztián Hincz x
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Cutting patterns of a simple form of a tent, so called 'Chinese hat', were analyzed in the paper. Stress distributions in prestressed membrane structures, according to cutting patterns prepared by the help of various numerical methods, were compared. A recently developed computer program, based on the dynamic relaxation method was used for the numerical analysis. The close connection between the shrinking of the cutting pattern and the stressing process of the tent was shown. Shrinking of the cutting pattern means that the stress free size of the tent is smaller than the boundaries of the theoretical shape, the tent structure achieves its shape and prestress during stressing on the original edges. The shrinking can be uniform or proportional to the stresses in the theoretical shape. The cutting pattern prepared without shrinking, produces tent surface that fits to the original boundaries without any strain and stress. To get prestress in the structure, the boundary conditions have to be changed.  Cutting patterns prepared by the help of different methods and based on various models, without shrinking and with different shrinking, were analyzed. After the short demonstration of the different methods, the stresses in warp and weft directions were compared in the different construction shapes.

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A cikk azonos alaprajzi elrendezésű, de különböző peremfeltételekkel rendelkező kötélhálók paraméteres statikai vizsgálatának eredményeit ismerteti. Röviden bemutatjuk a kötélhálók statikai vizsgálatának fő lépéseit és az általunk kidolgozott számítógépes programok alapjául szolgáló numerikus eljárást. Bemutatjuk és összehasonlítjuk a különböző alakú peremekre feszített szerkezetek esetén a változó előfeszítés és változó peremfeltételek (változó árboc- és peremmagasságok) mellett kapott kábelerők és elmozdulások jellemző értékeit.

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A cikkben bemutatjuk egy árbocra és külső merev peremekre feszített ponyvaszerkezet szélcsatorna- kísérlettel meghatározott alaki tényezőit. Az alaki tényezőket meghatároztuk az MSZ EN 13782 számú és a mára érvényét vesztett MSZ 15021/1-86 számú szabvány alapján is. A háromféle alakitényező-mezőnek megfelelően, azonos szélnyomás mellett elvégeztük az állapotváltozás-vizsgálatot és összehasonlítottuk a kapott lánc- és vetülékirányú metszeterők jellemző értékeit. A szerkezetet kétféle peremkialakítás mellett vizsgáltuk, a cikkben bemutatjuk a megtámasztások merevségének a hatását is a metszeterőkre és az elmozdulásokra.

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Geiger-féle kábelkupola parametrikus vizsgálata

Parametric Analysis of a Geiger Cable Dome

Építés - Építészettudomány
Authors:
Richárd Joao Rosa
and
Krisztián Hincz

An urging need for wide spanned closed areas without internal support has been continuously increasing. Amongst the possible structural solutions, we can find the different cable dome or suspen-dome systems inspired by the tensegrity structural form, which have become widely used due to their relatively simple mechanical behavior, economical material input and easy constructability. The conventional numerical methods cannot be used for their investigation due to the nonlinear behavior of the cables caused by the lack of resistance to compressive forces and the geometric nonlinearity due to the large structural motions. The Dynamic Relaxation Method is a favorable solution technic for the analysis of tensegrity structures. The method requires only the solution of the equations of motion for each degree of freedom, the structure’s stiffness matrix does not have to be compiled. The objective of the study was the development of a numerical model for the parametric investigation of cable dome systems. The applied environment is Rhinoceros 3D’s Grasshopper, which is particularly suitable for parametric investigations. In the developed computer program different design parameters can be examined, such as the number of inner rings and the radial segments, the length of the columns or the pretension, which is an extremely effective design approach in the case of complex spatial structural systems where the determination of the optimal configuration is crucial.

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Abstract

The current research aimed to obtain mean pressure distribution over an air-inflated membrane structure using Computational Wind Engineering tools. The steady-state analysis applied the Reynolds-Averaged Navier-Stokes equations with the k ε standard turbulence model. The pressure coefficients were compared with former experimental results to validate the numerical solution. Significant errors were detected close to the critical flow separation points when comparing the numerical results with the wind tunnel tests. However, these errors are local, and the numerical methodology provides accurate results in those areas with minor turbulence motion influence. In general, the numerical solution provided good approximation of the pressure coefficient fields.

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