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SPEAKER
COMPANY
TITLE OF PAPER
Antonia Larese De Tetto
International Center for Numerical Methods in Engineering (CIMNE)
Towards the virtual wind tunnel
Other Authors
Riccardo Rossi, International Center for Numerical Methods in Engineering (CIMNE) | Rubén Zorrilla, International Center for Numerical Methods in Engineering (CIMNE) | Roland Wüchner, Technical University of Munich | Eugenio Oñate, International Center for Numerical Methods in Engineering (CIMNE)
Abstract
The maturity of numerical techniques both in Computational Structural and Fluid Dynamics, accompanied by the availability of affordable high-performance hardware, allows the use of virtual rapid-prototyping facilities as realistic alternatives to traditional wind tunnel experiments.
This work aims to present a virtual wind tunnel tool that combines both “standard” bodyfitted approaches and innovative embedded techniques.
Two are the distinctive features of the work. Firstly, it allows the simulation of membrane structures subjected to large displacements. This is typically challenging both for embedded solvers, due to the need of modelling a strong discontinuity of the flow field in correspondence of the structural position, and for bodyfitted techniques, due to the large displacement regime. Secondly, it allows combining body fitted and embedded structures within the same simulation.
All the presented strategies are developed both in OpenMP and MPI.
The F.E. numerical analysis by stages of the city life commercial trade center: the steel-glass atrium system (Hadid Tower, Milan)
Other Authors
Paolo De’Angelis, Redesco Progetti
Abstract
This presentation refers to the Finite Element Analyses developed for the executive and constructional phases of the steel-glass system used at the bottom of the new Hadid Tower (City Life complex, Mi-lan) to investigate its mechanical response. In particular, as a completion of the Midas-Gen executive verification, dedicated analyses were conducted by Straus7 Non-linear to simulate the installation phases of the system by means of a sequential update of the stiffness (K) and mass (M) matrices up to the final configuration (dead and permanent load, also referred to as Status 1). A comparison between a more classic linear (mono-stage) calculation - with K and M constant - and the non-linear (by stages) calculation is then reported.
Evaluation of dam performance under seismic loads with DCR time history procedure, Case study of GERD main dam design
Other Authors
Alessandro Masciotta, Studio Masciotta
Abstract
The paper shows a systematic methodology to estimate the expected level of damage in concrete structures under seismic loads, using linear time-history analysis as proposed by USACE_1110-2-6051.
The procedure evaluates the performance of the dam taking into account not only the magnitude of stress response but also their time dependent characteristics evaluating the Demand-Capacity-Ratio (DCR) defined as the ratio of computed tensile stress to tensile strength of the concrete and the Cumulative-Inelastic-Duration (CID), that refers to the total duration of stress excursions above the tensile strength.
The method has been used to design the Grand Ethiopian Renaissance Dam (GERD) along the Nile River. The dam, currently under construction, has a maximum height of 175m, it’s 1780m long and has a global volume of 10.1 Mm3
Because of the large amount of data descending from the LTHA, a specific software was developed in order to evaluate the DCR-CID values for each inquired point of the dam.
The European project SUREBridge - Analysis of laboratory test beams
Other Authors
Erika Davini, University of Pisa | Fabio Ricci, AICE Consulting Srl
Abstract
The European research project SUREBridge (Sustainable Refurbishment of Existing Bridges) is developing a new concept for the structural strengthening of road bridges (www.surebridge.eu): glass fibre-reinforced polymer (GFRP) sandwich panels are installed on top of the existing concrete slabs; pre-stressed carbon fibre-reinforced polymer (CFRP) laminates are adhesively bonded to the bottom of the longitudinal girders.
Laboratory tests were carried out on 6-m long beams subjected to four-point bending: one reference un-strengthened concrete beam and three strengthened beams. Finite element models of the tested beams were developed by using the commercial software Straus7. A fibre model with BEAM and LAMINATE elements was defined with specific non-linear stress-strain curves for the confined and unconfined concrete, steel rebars, GFRP, and CFRP. The theoretical load-deflection curves obtained through non-linear static analyses showed a very good matching with the experimental results.
The European project SUREBridge - Analysis of a case study bridge
Other Authors
Paolo Sebastiano Valvo, University of Pisa | Fabio Ricci, AICE Consulting Srl
Abstract
The European research project SUREBridge (Sustainable Refurbishment of Existing Bridges) is developing a new concept for the structural strengthening of road bridges (www.surebridge.eu): glass fibre-reinforced polymer (GFRP) sandwich panels are installed on top of the existing concrete slabs; pre-stressed carbon fibre-reinforced polymer (CFRP) laminates are adhesively bonded to the bottom of the longitudinal girders.
A real bridge located in San Miniato (Pisa) was selected as a case study for the design of a strengthening intervention. A finite element model of the existing bridge was created by using the commercial finite element software Straus7. The outcomes of an in situ experimental campaign were used to define the geometry of the BEAM and PLATE elements, as well as their material properties. A finite element model of the strengthened bridge was then developed to evaluate the increased load-carrying capacity and demonstrate the effectiveness of the proposed technique.
Amba Aradam - An Underground Metro Station in the Historical Centre of Rome
Other Authors
Luca Nardoni, CODING S.r.l. | Pietro Luciani, CODING S.r.l. | Eliano Romani, Metro C S.C.p.A.
Abstract
Amba Aradam-Ipponio is an underground station currently under construction on the new Line C of Rome metro, the major infrastructure project of the city. The station is located between two important interchanges of the Roman metro system – the station Fori Imperali-Colosseo, transfer point to Line B and San Giovanni
station, transfer point to Line A. During digging for the station in 2016, a Praetorian Guard barracks, dating back to the 2nd century AD and believed to have been constructed under the Emperor Hadrian, was discovered 9 metres below street level. The station requires an excavation until to a depth of 30m, so the entire ancient Roman site will be moved, stored safely and later would be replaced at their original depth.
This presentation describes the design of the Amba Aradam-Ipponio station. For the complexity of both excavation geometry and staged construction, a number of issues related to the modelling of the structure in 3D finite element were investigates. Soil parameters used in models were derived from in situ soil
investigation. The construction sequence, retaining structure and building material were developed from the detail design of this project. The objective of the study is to provide a detailed assessment of structural forces in the internal walls and slabs on the basis of different modelling assumptions. The findings of this
study can have a wider application to underground structures, like stations and parking lots.
E-CL ‘Blue Dolphin Project – Antofagasta (CHILE)
In these months, two Bedeschi machines are being assembled for a new outdoor coal storage area, that will supply the thermoelectric power plant in Antofagasta region – Chile.
All activities of engineering, design and supply have been developed by Bedeschi S.p.A. of Limena (Padua) on behalf of Dimisa, a Mexican firm which was awarded the supply of conveyors and machines in the coal storage.
The storage area has a capacity of about 200 000 tons, plant size is 266 x 63 meters and off-the-ground height is 12 m.
The two machines supplied by Bedeschi are: a rotating stacker, capacity 3600 t / h, total weight approx. 450 tons, electric power installed approx. 400 kW; a portal reclaimer, capacity 1700 t / h, total weight approx. 530 tons, electric power installed approx. 700 kW.
In addition to the huge size of the machines, the engineering and design had to consider a particularly severe seismic Client specification, since the machines are installed in a zone with frequent earthquakes.
By means of Straus7 software, static verifications were carried out for the main load conditions (own weight, operating loads, wind) as well as seismic calculations with modal analysis and response spectrum.
Chernobyl New Safe Confinement - A Practical Example of Bim Approach in the Production Process
Abstract
Chernobyl New Safe Confinement large span arch roof will be presented as a successful project made by Cimolai, company leader in the steel construction.
The content of the presentation will introduce some key aspects of the structural design, workflow and management of the production process, erection on site and actual status of the project.
This full presentation is not available
Andrea Mardegan
Costs-Benefits analysis of different seismic retrofit solutions applied to a medium span bridge
Other Authors
Alessandro Contin, E2B srl
Abstract
The aim of the study is a FEM analysis of the behavior of different seismic retrofit methods applied to a medium span bridge. The most common devices such as elastomeric isolators, pendulum isolators, fluid viscous and hysteretic dampers are compared in terms of economic and structural benefits.
Full and Perforated Metal Plate Shear Walls for seismic protection of existing reinforced concrete buildings: numerical calibration of experimental tests and simplified design criteria
Abstract
In the present work it has been investigated the use of metal perforated shear panels for seismic retrofitting of existing reinforced concrete (rc) structures. In this context, the use of traditional metal panels, due to the development of diagonal tensile stresses generated on rc structures, often requires expensive and invasive local reinforcement interventions of existing members. Solutions based on low-yield steels and pure aluminium alloys allow to limit the extent of the actions that panels exert on rc beams and columns. An alternative technique is based on the use of steel perforated shear panels which, thanks to the presence of suitably arranged circular holes on the plates, can either eliminate or reduce the aforementioned reinforcing interventions. In the paper, after the development of a FEM model for steel perforated panels calibrated on experimental results, it has been simulated, by using the nonlinear analysis software ABAQUS, the experimental test conducted on a rc structure adequate with metal shear panels within the ILVA-IDEM research project. Subsequently, on this structure it has been evaluated the effectiveness of using perforated panels with different arrangement of holes (diffused or concentrated on edges) in order to reduce the strengthening of rc members. In conclusion, simplified criteria for the design of aforementioned seismic devices have been developed as a function of seismic deficiencies expressed by the existing rc structures examined.