Install Opensees 2.5.0 + Active Tcl 8.5 + Tcl Editor (Windows 64-bit):


First uninstall all versions of ActiveTcl and Opensees which is existed in your Computer. Also erase Tcl and tcleditor folders in local Disk (C).
Then unzip attached file and accomplish steps1 to 3:
1. Copy tcleditor folder into Disk (C).
2. Install "ActiveTcl8.5.18.0.298892-win32-x86_64-threaded.exe".
3. Copy and replace OpenSees 2.5.0 (rev 6536) into "Disk C/tcleditor/bin".
4. Now, use it and enjoy!!

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Prof. Julio Garcia discusses Earhquake simulation of Soil-Structure Interaction. The motion is produced by a harmonic shaker. A total of six frequencies of excitation are reached and displayed.
Frequency No 1: the system moves with such a frequency, that the whole system reacts almost as a rigid body.
Frequency No. 2: the excitation frequency increases and the frequency of the site is reached. The horizontal springs react. There is almost no reaction from the pendulums.
Frequency No.3: the excitation approaches the vibration frequency of the soil-structure model.
Frequency No. 4: the system reaches the fundamental frequency of the fixed base model. The soil-structure model does not react.
Frequency No. 5: the vibration frequency increases up to the second frequency of the fixed base model. The soil-structure model does not react.
Frequency No. 6: the vibration frequency decreases until the rest condition is reached.
Watch it and enjoy!!👇👇👇

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In this video, Prof. Terje Rølvåg discusses how you calculate and apply mass and stiffness proportional (Rayleigh) damping to FE models. He also explains why you should be careful with mass proportional damping!!👇👇👇

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Let me close today’s discussion with a novel suggestion to keep in mind while you are using a convergence algorithm for time history analysis.
From my own perspective, best priorities for analysis parameters are as mentioned below, to achieve appreciable convergence:
1- Changing Solution Algorithm
a) Trying Newton with Initial Tangent
b) Trying Broyden
c) Trying NewtonWithLineSearch
2- Trying reducing the time step by 2: dtanalysisnew=[expr
$DtAnalysis/2]
3- Trying reducing the time step by 10: dtanalysisnew=[expr
$DtAnalysis/10]
4- Trying reducing the time step by 100: dtanalysisnew=[expr
$DtAnalysis/100]
5- Try the previous methods with the smaller timestep:
a) Trying Newton with Initial Tangent
b) Trying Broyden
c) Trying NewtonWithLineSearch👇👇👇

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As i mentioned, a little while ago, sometimes we are going to accomplish three-dimensional simulation of a bridge that has a continuous concrete deck with the bents being integral, and the dual-column bent caps for the bridge are supported by reinforced concrete columns.
Following figure indicates the sample of first vertical bending mode shape of mentioned bridge with period of 0.33 sec.👇👇👇

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This figure indicates the sample of first rotational mode shape of mentioned bridge with period of 0.31 sec.👇👇👇

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This figure indicates the sample of first twisting mode shape of mentioned bridge with period of 0.26 sec.👇👇👇

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In this video, Prof. David Garber introduces the Performance-Based Design methodology.👇👇👇

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Professor Stephen William Hawking has passed away. He was an English theoretical physicist, cosmologist, author and Director of Research at the Centre for Theoretical Cosmology within the University of Cambridge. His scientific works included a collaboration with Roger Penrose on gravitational singularity theorems in the framework of general relativity and the theoretical prediction that black holes emit radiation, often called Hawking radiation. Hawking was the first to set out a theory of cosmology explained by a union of the general theory of relativity and quantum mechanics. He was a vigorous supporter of the many-worlds interpretation of quantum mechanics. Hawking was an Honorary Fellow of the Royal Society of Arts (FRSA), a lifetime member of the Pontifical Academy of Sciences, and a recipient of the Presidential Medal of Freedom, the highest civilian award in the United States. In 2002, Hawking was ranked number 25 in the BBC's poll of the 100 Greatest Britons. He was the Lucasian Professor of Mathematicsat the University of Cambridge between 1979 and 2009 and achieved commercial success with works of popular science in which he discusses his own theories and cosmology in general.
May peace be on him and condolences to his dear family, colleagues and the scientifics community at large for this loss.👇👇👇

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Happy Nowruz

Self Centering Viscoelastic Dampers (SCVDs) devised by (Karavasilis, Blakeborough et al. 2011). SCVDs are attained from series combination of viscoelastic (VE) dampers and self-centering (SC) device. The behavior of VE part is represented by generalized Maxwell which is combination of springs and dashpots. SC part consists of a pretensioning elastic tendon and a friction-based part. Under small amplitudes of deformation the SC part is inactive and SCVDs acts as a VE damper. Under large amplitudes of deformation the SC part is activated and SCVDs behaves as a hysteretic damper. Indeed, the VE part acts as an energy dissipating device and the SC part eliminates the residual drifts and inelastic deformations. Following figure indicates the SCVDs model.👇👇👇

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Which types of content do you prefer to study in this channel? Your votes help admins to growth of the channel Contents.
anonymous poll

Professional Tcl Language examples about different structures – 46
👍👍👍👍👍👍👍 53%

New algorithms to develop professional Code-Writing – 25
👍👍👍👍 29%

Video cources about earthquake engineering concepts – 12
👍👍 14%

Discussing about users big wrongs in programming – 4
👍 5%

👥 87 people voted so far. Poll closed.