New Products
Engineer's Studio® Ver.2
Supports SFHB 2012
3D plate dynamic non-linear analysis

œPrice Ultimate: US$18,000/Advanced: US$7,800
@@@@@@@@@ @@@@@Lite: US$5,200/Base: US$3,300
œRelease@July 19, 2012
UC-win series
Dynamic non-linear analysis

Introduction
Revision item in Engineer's Studio® Ver 2.00.00 are as followings.
  1. Supports Specifications For Highway Bridges 2012
  2. Decomposition algorithm for mesh of plate element has been improved. (Automatic decomposition in square, square{triangle)
  3. Supports damping element (F = C * V^a)
Specifications For Highway Bridges 2012
The contents of Specifications For Highway Bridges 2012 "Seismic design" has been greately changed. For the dynamic analysis of this product, "Reporting the seismic waveform of new SFHB", "‚l|ƒΣ of of reinforcement concrete section" and "‚l|ƒΣ of steel pier cross section" are the supported item and the verification of residual displacement is now supported as well.

In the latest SFHB, the type I waveform at the time of earthquake level 2 has been refreshed. All of the necessary waveform for the dynamic analysis are saved into the folder in which the product has been installed (C:\Program Files \FORUM 8\Engineers Studio 2.0.0\Samples\Waves\).

Figure 1 is the necessary input screen for ‚l|ƒΣ of reinforcement concrete section, where the values regarding the allowable strain of reinforcement are input. For the stress strain curve of concrete, the conventionally ultimate strain 0.8ƒΠcc has been changed to 0.5ƒΠcc. ‚l|ƒΣ characteristic (Figure 2) can be obtained from these conditions. This is the non-linear history model of bi-linear type specified by SFHB.

Click the image for a larger picture. Click the image for a larger picture.
Figure 1@
Input screen to calculate allowable strain ƒΓst
Figure 2 ‚l|ƒΣcharacteristic
of reinforcement concrete section

The necessary input screen for ‚l|ƒΣ of steel pier section is figure 3. This is in case of rectangular cross-section which is not concrete filled, where input regarding the allowable strain ƒΓa of steel pier. The non-linear history model is as shown in figure 4.

Click the image for a larger picture. Click the image for a larger picture.
Figure 3@Input screen for calculating
the allowable strain of steel pier cross section
Figure 4@‚l|ƒΣ characteristic
of steel pier cross section

Mesh partition of plate element
Mesh partition algorithm of plate element has been improved. Although conventionally the automatic division in a triangle had been supported, the outline can now be automatic divided in square element. The quality of automatic division has also been improved.

Click the image for a larger picture.
Figure 5@Automaic mesh partition of plate element

Damping element
Damping element is now supported. The characteristic of this damping element is a model in which the relationship of speed and force is shown in the following expression.



Where,
@F : damping resistance force(kN)
@V : speed(m/sec)
@C : damping coefficient(kN.sec/m)
@ƒΏ : velocity exponent (For example 0.3 etc. If it is set to 1.0, it is the linear viscous damper)

Damping element is placed between the node point of i edge and j edge like the spring element. The force is occurred according to the velocity difference of the 2 nodes occurred during the dynamic analysis, which is to say, relative velocity. This force is the damping force. Damping element has also the element coordinate system same as the spring element, however, the relationship of speed and force occurs in the uniaxial direction (xl) from the node point of i edge and j edge. If both nodes have the same coordinate, the different coordinate system needs to be obtained.

C and ƒΏ in the above expression are the value given by the maker who produces the damper.

When the damping force has occurred, the curve shown in the following figure can be seen.

Click the image for a larger picture.
Figure 6 Dynamic analysis result of damping element
of steel opposite lohse bridge

The other added functions
In addition, the functions have been added as follows.
  • Function to register the animation of displacement diagram (Figure 7)
  • It is possible to specify the concrete strain for calculating initial yield moment My0.
  • Function to recalculate an allowable curvature and allowable rotation angle using the axis force at the time of maximum response after calculating a frame (Figure 8).

Click the image for a larger picture. Click the image for a larger picture.
Figure 7@Function to register an animation Figure 8@Details of recalculated allowable curvature

Finally
We will continue to improve the function in the future as well. Please look forward to it!
(Up&Coming '12@Fall Issue)
–ί‚ι
Up&Coming

FORUM8