oo culm and the web is mad of bamboo slats connected to the culms on either side of the attachment points. To make things clearer (extracted from the above paper):
The authors of the paper did a numerical beam-model in ANSYS to see if they could replicate their theoretical results, and it is fairly correct (some differences due to the non-linear behavior of the semi-ring joints that they use, they remain of an order of 5-10% difference in maximum deflection).
My problem is that I am not able to obtain the same deflection values that the authors did (11.4 mm for a total service load of 7.063 kN applied punctually on the upper chord where the truss elements meet, or even replicate the load/deflection curve). Using an orthotropic material, with the engineering constants taken from (ResearchGate - A bamboo Beam-Column Connection Capable to Transmit Moment), my model is too flexible and I get a maximum deflection of 24.28 mm. I tried other orthotropic mechanical characterizations from other sources (Kathry & Mishra, 2012, Finite element analysis of bamboo and joints using steel members under various loading conditions for design study and Chand , Shukla & Sharma, 2008, Analysis of Mechanical Behaviour of Bamboo (Dendrocalamus strictus) by Using FEM), to no avail.
Of course, the problem could be with the material properties I inputted but I am trying to contact the research team to see directly with them. In the meantime, I am looking to make sure the model itself is not flawed.
It also seems to me that gravity was not accounted for in the numerical of the paper, but it seemed to much of an oversight to be possible (still, the deflection curve of their paper goes through 0).
There are several points I am not quite sure about: after all I am still fairly new to Karamba3D and may still have some things to learn about the inner mechanics of the plugin.
The very first is: should I put eccentricities of the slat-elements of the truss in the definition of their cross-section (directly with the Cross Section box) or as an offset of the beam element (with the ModifyElem box)? I tried both approaches and they seem to yield similar results (max. deflection change by 0.65mm in my latest model).
Second is: is it good practice to subdivide the beam elements in more than one element (and connecting the pieces rigidly) in order to get better results? I imagine some meshing or subdivision is performed when the analysis is run but there is no way of visualizing it (that I found in any case). Subdividing the chord elements seems to give smoother deformation results (though I did not check stress I have to admit). My issue on this topic is that the subdivision of the slat-elements of the web is problematic. On the screenshot below, where the elements are divided in two, lets take the example of node 18. It seems to me that all elements of the diagonal element (28, 29, 34 & 35) are all rigidly connected to the node 18. 28 & 29 are not connected together, independently from 34 & 35. The added rigidity may not be a bad thing for my model, but it is not correct I think? Is there a way of solving the problem?
Element tags:
Node tags:
And here is my GH file (clean enough hopefully): verification-model-V04.gh
Thank you all in advance for any insight (even on the inner logics of Karamba)!
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ect + Geco
TUTORS:
Arturo Tedeschi (Authorized Rhino Trainer) + Maurizio Arturo Degni
Il workshop avanzato ECOLOGIC PATTERNS affronta l’impiego di strategie parametriche all’interno del processo progettuale, approfondendo l’utilizzo di Grasshopper in sinergia con plug-in, software di analisi ambientale e simulazione fisica. Obiettivo fondamentale è la generazione della forma come risultato di tecniche di form-finding e di input ambientali (solari, termici e acustici). Verranno acquisiti nuovi strumenti operativi e di simulazione al fine di costruire modelli parametrici ottimizzati in grado di adattarsi a diverse condizioni di contesto.
MORE INFO…
and enhancing its intrinsic qualities.
The program of the workshop consists of an intense exploration of Günther Domenig’s Steinhaus (situated at Ossiachersee in Carinthia, Austria) and it’s visible and hidden properties. By the use of mapping strategies these properties can be isolated and will be implemented as a temporary installation.
Each participant will investigate certain spatial aspects using methods of mapping.
In a series of tutorials on various techniques, strategies will be developed to translate and structure the collected information into a unified spatial concept. Participants will work amongst groups to propose the result of their investigations with a site specific installation which will be digitally materialized on site.
Complementary program:
lecture by Stefan Rutzinger & Kristina Schinegger, soma
guided tour and lecture about Steinhaus and Günther Domenig by Christian Halm
presentation by Clemens Preisinger, karamba
Closing event and presentation
250€ early bird registration (until June 14th) | 300€ (until June 28)
More information at www.semf.cc
Email us at info@SeMF.cc…
rsi giornalieri (livello base) dedicati a 4 diversi topic Rhinoceros - 8 febbraio Grasshopper - 16 febbraio Rhino cam - 8 marzo Stampa 3D - 9 marzo
tutor: Amleto Picerno Ceraso, Francesca Viglione, Gianpiero Picerno Ceraso.
. Arduino for interaction (livello base-medio) 15, 16 marzo Il workshop parte dalle basi della programmazione di arduino fino ad arrivare all’interazione tra un oggetto fisico ed un imput informativo tutor: Gianpiero Picerno Ceraso
. Grasshopper advanced: “Complex surface” (livello medio) - 18, 19, 20 marzo Il workshop ha come obiettivo lo sviluppo di superfici complesse rispondenti ad informazioni provenienti dall’ambiente. Il corso parte dalle nozioni di Grasshopper fino ad arrivare alla possibile realizzazione di un oggetto tramite le tecniche di fabbrizazione digitale. tutor: Amleto Picerno Ceraso nb: è richiesta una conoscenza base di Grasshopper
. Emotional design (livello alto) 23, 24, 25 marzo Il workshop verterà sull’acquisizione, registrazione e manipolazione di tali dati/emozioni tramite Grasshopper e il loro utilizzo per controllare i parametri del design di specifici oggetti che diventeranno quindi, essendo customizzanti con le specifiche emozioni dell’utente, istanze e memoria tattile di precise esperienze. tutor: Andrea Graziano nb: è richiesta una conoscenza base di Grasshopper
. Fabricated fashion (livello alto) 26, 27, 28, 29, 30 marzo Il tema del workshop verte sulle tecniche di progettazione digitale applicate al fashion. tutor: Luis e Elizabeth Fraguada nb: è richiesta una conoscenza base di Grasshopper
. Blender (livello alto) - 16, 17, 18 maggio tutor: Andrea Graziano
. Interaction design: Arduino + Grasshopper (livello medio) - 2, 3, 4 maggio Il corso ha l’obiettivo di indagare processi di interazione tra le persone e gli ambienti in cui vivono attraverso il responsive design. nb: è richiesta una conoscenza base di Grasshopper e Arduino. tutor: Amleto Picerno Ceraso del Mediterranean FabLab e Antonio Grillo del FabLab Napoli.
info su costi: http://www.medaarch.com/2765-il-nuovo-calendario-attivita-firmato-medaarch/
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) Course Fee: Professional EUR 825,- (+VAT), Student EUR 415,- (+VAT)
Led by plug-in developer and structural engineer Clemens Preisinger, along with Zeynep Aksoz and Matthew Tam from the expert Karamba3D team, this three-day workshop will focus on methods of setting up structural systems in the parametric environment of Grasshopper. The participants will be guided through the basics of analyzing and interpreting structural models, to optimization processes, and how to integrate Karamba3D into C# scripts.
This workshop is aimed towards beginner to intermediate users of Karamba3D. However, advanced users are also encouraged to apply. It is open to both professional and academic users. For beginner users of Rhino and Grasshopper, there will be an optional introductory course one day before the Karamba3D course.
Karamba3D 1is a parametric structural engineering tool which provides accurate analysis of spatial trusses, frames, and shells. Karamba3D is fully embedded in the parametric design environment of Grasshopper, a plug-in for the 3D modeling tool Rhinoceros. This makes it easy to combine parameterized geometric models, finite element calculations, and optimization algorithms like Galapagos.
Course Outline
Introduction and presentation of project examples
Optimization of cross sections of line-based and surface-based elements
Geometric optimization
Topological optimization
Structural performance informed form finding
Understanding analysis algorithms embedded in Karamba3D and visualizing results
Complex workflow processes in Rhino, Grasshopper, and Karamba3D
Places are limited to a maximum of 10 participants with limited educational places. A minimum of 4 participants is required for the workshop to take place. The workshop will be canceled if this quota is not filled by October 28. The workshop will be taught in English.
Course Requirements
Basic Rhino and Grasshopper knowledge is recommended. An introductory course is offered.
No knowledge of Karamba3D is needed. Participants should bring their own laptops with Grasshopper and either Rhino 5 or Rhino 6 installed. You can download a 90-day trial version of Rhino. Karamba3D ½ year licenses for non-commercial use will be provided to all participants.
Please register here……
Added by Matthew Tam at 6:38am on September 13, 2019
artes y Jueves 18:00 a 22:00 Sábado 10:00 a 14:00
Durante el curso el participante conocerá y entenderá los fundamentos de programación y sus aplicaciones usando Processing: una plataforma de desarrollo en lenguaje java, que surgió en MIT, creada por investigadores enfocados a procesos numéricos y/o generativos para arte y diseño. Se realizarán ejercicios programados para generar gráficas, volúmenes o situaciones kinéticas en tiempo real, basado en algoritmos o reglas complejas y en el procesamiento de datos, soluciones que permitirán comprender temas esenciales como datos primitivos y datos compuestos, algoritmos generativos, geometría 2D y 3D paramétrica, programación estructurada y programación orientada a objetos, control de flujo, variables y ámbito de variable, entre otros temas.
NOTA: Es requisito para cursar los talleres del Bloque 1 y Bloque 2 que los alumnos inscritos tegan bases sobre programación. Este taller forma parte del propedéutico para el Diplomado.…
Added by Alberto Lara at 9:37pm on February 12, 2012
lysing and assessing sustainable performance of buildings and structures, called sustainability-open. Yes, open-source: that means everybody can use it as much as they want. We hope that this will give designers and engineers to make more sustainable buildings and structures in the future. And you can take a look at our code - to learn or improve it if you like! The framework is still in early stage and doesn't do a lot yet at the moment, so this is your chance to become an early-adopter.(By the way, very soon new components will come out that will early let you do more.)
The framework is linked to Grasshopper and Rhino - as soon as we have a little bit more, we will add some links on this site too.
At the Design Modelling Symposium Berlin (September 28 - October 3)we will host a workshop over the weekend which will show you everything about the framework and its components, our future plans, etc. We will also teach you how to develop your own components. Not everything will be purely related to the framework as we will be doing a lot of .net development related to Rhino/Grasshopper and other parametric applications. If you would like to know more about the framework, take a look at: http://www.sustainability-open.com or follow us on Twitter: @sustainableopenIf you would like to sign up for the workshop in Berlin or would like to know more, go here:https://www.design-modelling-symposium.de/frontend/index.php?folder...Regards,Jeroen…
lysing and assessing sustainable performance of buildings and structures, called sustainability-open. Yes, open-source: that means everybody can use it as much as they want. We hope that this will give designers and engineers to make more sustainable buildings and structures in the future. And you can take a look at our code - to learn or improve it if you like! The framework is still in early stage and doesn't do a lot yet at the moment, so this is your chance to become an early-adopter.(By the way, very soon new components will come out that will early let you do more.)
The framework is linked to Grasshopper and Rhino - as soon as we have a little bit more, we will add some links on this site too.
At the Design Modelling Symposium Berlin (September 28 - October 3)we will host a workshop over the weekend which will show you everything about the framework and its components, our future plans, etc. We will also teach you how to develop your own components. Not everything will be purely related to the framework as we will be doing a lot of .net development related to Rhino/Grasshopper and other parametric applications. If you would like to know more about the framework, take a look at: http://www.sustainability-open.com or follow us on Twitter: @sustainableopenIf you would like to sign up for the workshop in Berlin or would like to know more, go here:https://www.design-modelling-symposium.de/frontend/index.php?folder_id=180Regards,Jeroen…