Components

This page has been superseded by Components in the Android phone, iPhone & iPad volume

Android phone & iPhone

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Components

At a glance: Components on an Android phone or an iPhone are described here. The General – Components section describes aspects of the components edit facilities that are common to Mac , PC, Android phone and iPhone.

The main Components tab

Component names are listed on the Components tab; one of the main tabs described in the Android phone &  iPhone – Introduction under Lists of Entities.

The Component edit facilities are Entity edit facilities as described in the Android phone & iPhone – Introduction. Here is an elaboration on that description.

Button – “Import component from another XSF file” on this Components tab is described in Android phone & iPhone – Files under Other files.

Button – “Write transformed section properties” on this Components tab writes a text file of the transformed section properties of the cross-section. This is a text file as described in Android phone & iPhone – Files under Text files. For each component it gives:

  • The total area
  • The centroid of that area in terms of the X, Y axes.
  • The second moments of area about the X and Y axes.

Finally it gives the same information for the whole cross-section using modula ratios stipulated for each component.

None of this information is used in the main computations described under Load cases.

“+” button in the top right corner of the display invokes facilities for adding a component to the list. A tap on this causes a display to appear offering:

  • Shape, typically of concrete.
  • Point, typically an arrangement of steel bars.
  • Cancel.

A tap on a choice will cause the component list to reappear. If the choice was not “cancel” at the top of the list is a prompt “Enter a – component name” in grey text on a white background. A tap on that grey text will cause a virtual keyboard to appear at the bottom of the display so that a name can be entered.

The requirements of the name are described in Android phone & iPhone – Introduction under Entity names.

Shape component edit facility – First display

At the top of the first display is a label “Modula ratio=” and a number with a blue glow indicating it is editable. This is used for the transformed section properties but not in the computations described under Load Cases.

Under that is a label “Material=” and the name of a material. A tap on the material name will reveal a list of the names of the materials that have been described. Any one of these materials can be selected.

Under that is a label “Shape described” and a segmented control offering Anti-clockwise and Clockwise. The shape description on the third and fourth displays must conform to this.

Button – “Write to text file” near the bottom of this display writes a description of the component to a text file as described in Android phone & iPhone –  Files, Text Files.

The next > button in the top right corner leads to the second display

Shape component edit facility – Second display

The second display has a heading Stage and Other distortions.

Under this heading is a label “In terms of reference axes” and the word “Global” or the name of a load case. A tap on this “Global” or the load case name will reveal a list of the names of the load cases that have been described and also “Global”. Any one of these can be selected. Each load case has reference axes and “Global” means the X, Y axes. Under that the selected axes are described; the X and Y of the origin and the angle of the reference axis.

The rest of this display is in two parts labeled “Stage distortion” and “Other distortion” respectively.

Each part has three lines labeled

  • “Axial strain=” .
  • “Ref. ax. cur.=” that means “Reference axis curvature =”.
  • “Other ax. cur.=” that means “Other axis curvature =”.

and each line has a number with a blue glow indicating it is editable.

If the user does not intend to use the stage distortion and other distortion facilities in the application all these number should be set to zero.

The application includes facilities that automatically give values to these number: the “Adopt this load case as at a stage” button on the load case edit display sets the stage distortion, and the “Apply this set” button on the time affect set edit display makes contributions to the Other distortion.

Where these facilities suffice there is no need to edit these number. The need to edit the other distortion numbers is discussed in General – Time affect sets , Time affects not included in the automatic facilities

The next > button in the top right corner leads to the third display.

Shape component edit facility – Third and fourth displays

The third display is a graphic display of the component and the whole cross-section; the other components being gray. This is as described in Android phone &  iPhone – Introduction, Graphical information. It is editable and the next display, a fourth display is available for keying in numbers as described in Android phone & iPhone – Introduction, Graphical information.

In addition to the red circle indicating the corner that is the subject of the editing the side from that corner to the next is red to indicate the side that will be broken if a corner is added.

Point component edit facility – First display

At the top of the first display is a label “Modula ratio=” and a number with a blue glow indicating it is editable. This is used for the transformed section properties but not in the computations described under Load Cases.

Under that is a label “Material=” and the name of a material. A tap on the material name will reveal a list of the names of the materials that have been described. Any one of these materials can be selected.

Under that is a label “Section area =” with a number having a blue glow indicating it is editable. That number is the cross-sectional area associated with one point, usually the cross-section area of one steel reinforcing bar. This is used in the computations; both described under load cases and also the transformed section properties.

Further down is a label “Bar diameter =” with a number having a blue glow indicating it is editable. This is ignored by the computation described under load cases and also the transformed section properties. It is used with two buttons on the same display.

Button – “Compute from diam.” Computes a cross-sectional area from the given bar diameter and puts the result in the number adjacent to the “Section area =” label.

Button – “Compute from area” Computes a diameter from the given sectional area and puts the result in the number adjacent to the “Bar diameter =” label.

Button – “Write to text file” near the bottom of this display writes a description of the component to a text file as described in Android phone & iPhone – Files, Text Files.

The next > button in the top right corner leads to the second display.

Point component edit facility – Second and third displays

The second display is a graphic display of the component and the whole cross-section; the other components being grayed. This is as described in Android phone & iPhone – Introduction, Graphical information. It is editable and the next display, a third display is available for keying in numbers as described in iPhone – Introduction, Graphical information.

The display for each point on the editing display has four items:

  • “X =” label with a number being the X of the location.
  • “Y =” label with a number being the Y of the location.
  • “Other strain =” label with a number being a strain value that is the other distortion.
  • “Stage strain =” label with a number being a strain value that is the stage distortion.

If the user does not intend to use the stage distortion and other distortion facilities in the application these “other strain” and “stage strain” values should be zero.

The application includes facilities that automatically give values to these number: the “Adopt this load case as at a stage” button on the load case edit display sets this stage strain, and the “Apply this set” button on the time affect set edit display makes contributions to this other strain.

Where these facilities suffice there is no need to edit these number.  The need to edit the other distortion numbers is discussed in General – Time affect sets , Time affects not included in the automatic facilities