algorithmic modeling for Rhino
Hi everybody,
I´ve got some questions:
I need to know if Karamba calculates the instant deflection of a beam or the deflection along a certain period of time (e.g. 5 years)
I´m using reinforced concrete, is the material homogenous for the calculation or there is a division between steel and concrete?
And the last one, is it possible to export results to an Excel sheet or another format?
Thanks in advance,
Patricia
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Hi Patricia,
Karamba 1.0.5 calculates the deformation assuming linear elastic material behavior. In order to allow for creep, shrinkage and cracking in reinforced concrete you can reduce the Young's Modulus by a factor. For reinforced concrete slabs the influence of shrinkage, creep and cracking can be approximated as follows:
max_f ~ 1.2*(1+phi_inf)/0.6*f_c
here max_f is the maximum deflection at time t=infinite, 1.2 is a factor that takes account of shrinkage, phi_inf is the creep factor (phi_inf~2.5 inside buildings, phi_inf~0.7*2.5 outside of buildings) and 1/0.6 allows for cracking.
Thus the factor for Young's Modulus is
0.6/(1.2*(1+phi_inf)).
The above relation can be found in 'Beton im Hochbau - Handbuch für den konstruktiven Vorentwurf', A. Pauser, Verlag Bau + Technik, Düsseldorf, 1998.
Karamba 1.0.5 assumes an isotropic material for beams. This is normally sufficient for analyzing and designing reinforced concrete structures.
Karamba 1.0.5 offers the possibility to export models via the DAfSt-format which can be read by Robot, RFem and other FE-packagers. However the DAfSt-format does not support shells. Using VB- or C# scripts one has full access to the model properties (see the Karamba Hacker's guide) which can be used to write custom exporters.
Best,
Clemens
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