Search Results

1 - 10 of 305 items :

  • "nonlinear analysis" x
Clear All
Application Of The Distributed Plasticity Concept In Quick Nonlinear Analysis Of Reinforced Concrete Shear Walls

, Bucureşti, Romania. Ile N., Reynouard J. M., 2000. Nonlinear Analysis of Reinforced Concrete Shear Wall under Earthquake Loading. Journal of Earthquake Engineering, 4(2), pp. 183 - 213. Ile N., Reynouard J. M., 2005. Behaviour of U – Shaped Walls Subjected to Uniaxialand Biaxial Cyclic Lateral Loading. Journal of Earthquake Engineering, 9(1), pp. 67 – 94. Massone M. Leonardo, Orakcal K., Wallace W. John, 2004. Flexural and Shear Response in Slender RC Shear Walls. In: 13 th World Conference on Earthquake Engineering, Vancouver, B.C., Canada

Open access
On consistent nonlinear analysis of soil–structure interaction problems

o ) $$\begin{array}{} \displaystyle \nu^{cr}=\frac{\beta(t_{o}=28)}{\beta(t_{o})} \end{array}$$ (15) where t o is the age of concrete at the beginning of analysis. The proposed simplified approach yields an equivalent, relative to the EC2, visco-elastic implicit creep model. 4 Case study In order to analyse the consequences of the consistent nonlinear analysis that takes into account the cracking, creep and ageing effects in the RC structure, a deep excavation, carried out in the uniform layer of quaternary sandy clays and protected by a diaphragm

Open access
Nonlinear Analysis of the Hermetic Postament Safety During Technology Accident in the Nuclear Power Plant

, Politechniki Częstochowskiej, Częstochowa, 2015, ISBN 978-83-65179-20-3. [12] Králik, J. et al. Structural Reliability for Containment of VVER 440/213 Type, In Safety and Reliability: Methodology and Applications - Nowakowski et al. (Eds) © Taylor & Francis Group, London, 2015, p.2279-2286. [13] Králik, J. Nonlinear Analysis of the NPP Technology Segments Integrity under Extreme Accident Loads for Mochovce 3 and 4, Project 3&4 Unit NPP Mochovce Completion , site: Nuclear Island, No. PNM3406345602, Bratislava, 2015. [14] Krejsa, M. Probabilistic failure

Open access
Comparative Study for Buckling Resistance of Steel Sheets Provided with Stiffeners Used in Bridge Structures

Abstract

The subject discussed in this paper is based on an experimental bridge model which was built to study the pre-critical and post-critical buckling behaviour of steel webs of box girders provided with longitudinal and transversal stiffeners. The article presents a comparison between the experimental results and the numerical ones for buckling resistance of stiffened steel webs. For this purpose two types of analysis will be carried out: an analysis to establish the values and eigenvectors of buckling, after which the critical factor for the first mode of buckling will be obtained, and then a geometrical and physical nonlinear analysis will be performed.

Open access
Numerical modelling of the reinforced concrete influence on a combined system of tunnel support

Abstract

The paper presents the experimental, laboratory determined rheological-dynamic analysis of the properties of fiber reinforced concrete, which was then utilized to show nonlinear analysis of combined system of tunnel support structure. According to the performed experiments and calculations, different processes of destructive behavior of tunnel lining were simulated in combination with elastic and elastic-plastic behavior of materials taking into account the tunnel loading, the interaction between the fiber reinforced concrete and soil, as well as the interaction between the fiber reinforced concrete and the inner lining of the tunnel.

Open access
The Influence of the Track Axis Curvature at Railway Filler-Beam Deck Bridges

Abstract

The article presents a comparative study between the simplified method calculation proposed by the prescriptions of design codes and the analysis with the FEM program LUSAS [1], regarding the influence of the curvature of the track axis at railway bridges with steel beams embedded in concrete.

The study was made on three simply supported bridges with the openings chosen so as to cover the openings used for this constructive solution, namely 10m ≤L≤30m. For each analysed opening the curve radius of the track axis was varied, in the domain in which are representative as effects, namely 100mR≤1500m. In the case of Lusas FEM analysis, a physically nonlinear analysis it was previously carried out, after which the cracked concrete was removed, as its participation in the structural stiffness is practically non-existent.

Studying the outcomes revealed by the two calculations presented, it can be concluded that the simplified method proposed by the design codes leads to a overvaluation of the track axis curvature influence at the railway filler-beam deck bridges.

Open access
Experimentally Validated Nonlinear Analysis of Bridge Plate Girders with Deformations

Abstract

Comprehensive methodology of numerical nonlinear analysis of the consecutive phases in the structural behaviour of bridge plate girders with deformations is presented. The analysis concerns all stages of structure loading until failure and especially determination of the ultimate shear load capacity. Verification and validation of the numerical procedures proposed is based on comparison of the calculated results with effects of experimental laboratory shear capacity tests of plate girders carried out at the University of Ljubljana.

Open access
Probabilistic Nonlinear Analysis of the NPP Hermetic Cover Failure due to Extreme Pressure and Temperature

Abstract

This paper describes the probabilistic nonlinear analysis of the reactor cover under a high internal overpressure and temperature. The scenario of the hard accident in NPP and the methodology of the calculation of the fragility curve of the failure overpressure using the probabilistic safety assessment PSA 2 level is presented. The model and resistance uncertainties were taken into account in the response surface method (RSM).

Open access
Probabilistic Nonlinear Analysis of Reinforced Concrete Bubbler Tower Structure Failure

. [13] KALA, Z. Sensitivity analysis of steel plane frames with initial imperfections, Engineering Structures, 33, 8, pp.2342-2349, 2011. [14] KAZAKOV K., A.YANAKIEVA, Computational Effectivness of the Augmented Lagrange Method in the FE Simulations of Pull-out of Steel Bar and Concrete, Comptes rendus de l'Académie bulgarie des Sciences, Tome 65 (2), 219-224, 2012. [15] KRÁLIK,J. Probability Nonlinear Analysis of Reinforced Concrete Containment Damage due to High Internal Over-pressure. Engineering mechanics. EACR Brno, Vol.12, No.2

Open access
Comparative Study Between Experimental Results and the Numerical One of the Lateral Buckling Resistence for the Two Curved I Girders of a Curved Bridge Model

Rezumat

Articolul prezintă un studiul al rezistenţei la flambaj lateral pentru grinzile curbe utilizate la poduri.

Rezistenţa la flambaj lateral va fi evaluată printr-o analiză geometric şi fizic neliniară utilizând programul de calcul Lusas®, fară a considera imperfecţiunile de execuţie. Pentru a da veridicitate rezultatelor analitice, studiul numeric se va realiza pe unul din modelele fizice prezentate în lucrarea [1] care pune la dispoziţie valori ale încercărilor experimentale.

Geometria modelului fizic din lucrarea [1] se bazează pe o analiză dimensională a grinzilor curbe „I” utilizate în mod frecvent la poduri. Modelul fizic este alcătuit din două grinzi I curbe, dublu simetrice, prevăzute cu antretoaze şi contravântuiri la nivelul tălpilor. De antretoazele de capăt sunt sudate pe direcţia axei curbe două console scurte de lungime e .

Schema statică a structurii este grinda simplu rezemată cu console, ale cărei aparate de reazem sunt dispuse pe direcţia coardei. Consolele scurte vor fi încărcate cu prese hidraulice la o forţă P care are ca efect în grinda principală un moment încovoietor uniform având valoarea P *e şi forţă tăietoare zero.

Pentru analiza neliniară s-a folosit formularea Total Lagrange, împreună cu utilizarea metodei lungimii arcului modificat formulată de Crisfield. De asemenea s-a considerat comportarea neliniară a materialului.

Evaluarea rezistenţei la flambaj lateral constă în determinarea momentului încovoietor critic pentru care grinda îşi pierde stabilitatea. Comparaţia rezultatelor numerice cu cele experimentale preluate, confirmă posibilitatea evaluării numerice a rezistenţei la flambaj lateral pentru grinzile curbe.

Open access