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Polar

 

 

 

The Polar Chart allows the user to plot the bidirectional interaction trace and response envelope of the ground motion. The response is calculated for a particular period of vibration (T) and damping using a two-degree-of-freedom (2DOF) bidirectional system.

 


Chart

Show/hide chart general features:

Legend: show/hide the chart series legend

Records: show/hide individual records (components & triplets)

X Log: switch the X-axis scale between Linear and Logarithmic

Y Log: switch the Y-axis scale between Linear and Logarithmic

X Grid: show/hide grids on the X coordinates (parallel to Y-axis)

Y Grid: show/hide grids on the Y coordinates (parallel to X-axis)

Norm X-Axis: switch the X-axis normalization on/off (normalizes X-axis such that maximum value is 1.0)

Norm Y-Axis: switch the Y-axis normalization on/off (normalizes Y-axis such that maximum value is 1.0)

Freeze X-Axis: freeze X-axis scale to its current range (min,max)

Freeze X-Axis: freeze Y-axis scale to its current range (min,max)

Polar

2D Trace: Show the 2D Bidirectional trace of Displacement, Velocity or Acceleration response at a given period, T1, and damping 

Max Angle: show/hide the Maximum-Response Directions.

Min Angle: show/hide the Minimum-Response Directions.

H1 Dir: Plot the axis of component 1.

H2 Dir: Plot the axis of component 2.

True Azimuth: Plot the record based on its unique azimuth.

T1 (s): Plot the polar on a specific duration. The user can select the duration from the drop-down list or can type the a specific duration.

Damping: Select the desirable damping ratio. The user can select the damping ratio from the drop-down list or can type the a specific damping ratio.

Polar Envelope: Show the Polar Bidirectional Envelope of the trace.

Show Rot100, Rot50 and Rot0, SRSS, Geomean, and Max(H1,H2) Envelopes

Polar (Expert)

Symmetric: Response along angles alpha and alpha+180 degrees is taken as the maximum of the two values.

Type: Response Type: Acceleration, Velocity or Displacement

T2/T1: Ratio used to define the period of vibration in Direction. The default value for T2/T1 is 1.

Modification

For modified records, show/hide the following:

Original: display the original record (before modification)

Modified: display the modified record (after modification)

Line Wt (Mod): display the modified chart with a heavier line thickness

Copy Data

Copy Metadata: copies the record view record data, including header and footers of the data, which makes it easy to create record tables in MS Excel or Word.

Copy Chart Data: copies the chart series data which can be exported to create tables in MS Excel or Word.

Copy Chart Image: take a screenshot of the selected chart

 

Figure: Symmetric Polar Chart of 65010 record along with Polar Envelope, maximum and minimum angles

 

Figure: Asymmetric Polar Chart of 65010 record along with Polar Envelope, maximum and minimum angles

 

Figure: H1 and H2 Directions of CSP Record

 

Figure: H1 and H2 Directions oriented along the azimuth of CSP Record

 

 

 

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