STRAP 2012 Enhancements

2012 ATIR Engineering Software Ltd.

Version 2012

October 2012

Enhancements Guide

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STRAP2012 - Enhancements

Highlights

page

New wall element :A new wall element with the following featureshas been added to the geometry "Wall"option.

openings in the wall may be definedadditional nodes are automatically added atthe top/bottom faces of the wall when itconnects to a wall with a different cross-section above or below.

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User-defined steel shapes :General combined steel shapes can now bedefined in STRAP geometry and designed inthe steel postprocessor. The shapes can bearbitrary combinations of standard steelsections, plates and sections defined bydimensions.

page

Section property reduction factors :Section area and moment-of-inertia can now be reduced by a user-defined factor. This option isuseful for modeling cracked concrete sections.

page

Interface language :The interface language (input, output and Help) may now be specified in the program "Setup"option. The following languages may be selected:

English, Spanish, Russian, Portuguese, Chinese, Taiwan Chinese.

Detailed List of Enhancements:General:

The interface language (input, output and Help) may now be specified in the program "Setup"option. The following languages may be selected: English, Spanish, Russian, Portuguese,Chinese.Beam/element selection by section property: three new options have been added - "Select allproperties" and "Select none" and "Invert selection"Beam numbers revised in STRAP geometry are now automatically updated in the Steel designmodule.

Geometry:General:

"Hidden

lines"

may

now

be

deleted

from

the

display

(similar

to

Results)

page

Nodes:The program will not allow nodes used for defining "Grid lines" to be deleted.Move nodes: if a moved node is connected to a wall element, the program asks the userwhether to revise the wall section accordingly. If the relevant wall section is used in otherlocations

in

the

model,

the

program

will

ask

whether

to

revise

all

of

them.

page

Restraints:Delete

rigid

links:

the

link

can

now

be

deleted

in

specified

directions

only.

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STRAP2012 - Enhancements4


Beams - general:"Split beam" with tapered section:

the program now automatically creates new sections at the new intermediate nodesnew intermediate "solid sections" are created if the end sections are also "solid sections"(from CROSEC). This feature is important for post-tensioned concrete beam design (POSTTEN).

page

page

page

Beam properties:General combined steel shapes can now be defined.

the shapes can be arbitrary combinations of standard steel sections, plates and sectionsdefined by dimensions.the various elements can be attached to each other at any location and at any angle.the program calculates all section properties required by the Steel design module - plasticmoment, shear center, principal axes, etc.

Section area and moment-of-inertia can now be reduced by a user-defined factor. Thisoption is useful for modeling cracked concrete sections. A table of section properties sorted by display colour may now be printed. This table canserve as a legend for a printout of the model geometry that shows the sections in colour.A new option to delete all unused properties has been added.The user may now define a name for each propertyIncreased capacity:

32,000 properties32,000 materialsmaterial name: 20 characters

page

Walls:A new wall element with the following features has been added to the geometry "Wall"option.

rectangular openings in the wall may be defined at any location and with any dimensions.additional nodes are automatically added at the top/bottom faces of the wall when itconnects to a wall with a different cross-section above or below, i.e. the new element canhave more than four nodes.

"Old" wall elements are automatically converted to the "new" element and new nodes areautomatically added in the cases described above.

Loads:

page

Global loads:applied to nodes: a new option to select the nodes that the load is applied to.applied to a line of beams: a new option to define a chain of lines. a new option to select several global loads and revise the type, direction and level of all ofthem.

Wind loads:a new option to apply loads to only selected beams in a "panel"New wind load Codes added: ASCE, Australia

Results:BS8007: when the program increases the reinforcement to prevent cracking of the concrete onone face, it now also tries increasing the reinforcement on the opposite face when searching forthe optimal solution.The Australian concrete code AS3600 has been added: The program now calculates thefollowing according to the code: Punching, slab deflections, slab reinforcement.

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Steel:The new "General combined steel shapes" may be designed by the Steel design module (referto the Geometry enhancements).Design according to the ASCE code has been updated to the 2012 versionDesign according to the AASHTO code has been updated to the 2012 version

Dynamics:page

page

page

Different "sets" of weight eccentricities may now be defined for a model:Each set can be assigned to an earthquake direction and the calculation of natural frequencyand mode shapes for all sets can be carried out simultaneously.The results for all "sets" (or selected ones) can be transferred simultaneously to the STRAPresults.

A new table that displays for all levels whether they are "soft storeys" and all values used forthe soft storey calculation.A new table that displays the"Stability Coefficient ( )" values according to levels.Storey shear table: a new column has been added that shows the moments generated by theshear forces.The following code has been added: Australia AS 1170.4 - 2007The

following

Codes

have

been

updated

according

to

the

latest

versions:

ASCE,

Taiwan.

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Language

Select an interface language.

Click the "flag" icon at the top of the program main menu:

Note:the characters may not display correctly after selectinga different language. Revise the Windows "Controlpanel" "Language and regional settings as explained inthe menu.

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Beam selection

Limit by properties Further limit the beam selection according to property groups:

Yes: Beams in the property group are selectedNo: Beams in the property group are not

selected

Click:

Select all to set all properties to Yes

Select none to set all properties to No

Invert selection to toggle the selection for all

properties



Move nodes

If a wall is connected to the selected node, the program now asks how to revise the wall section:

The program creates new nodes where necessary.

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Rigid links

Remove Delete rigid links defined at the specified nodes and links defined in the Walls option.

The links may be deleted in

all directions or in

selected directions only:



General steel sections

Use this option to create a combined section consisting of any number of steel elements - plates or rolledsections. For example:

"Reference points" are selected on the new subsection and the current combined section; the programcombines the sections at the respective reference points. For example:

Subsections may be rolled sections, plates or existing STRAP property steel sectionsAll sections may be rotated to any angle or "flipped" - horizontally or vertically.

Refer to:General combined - menusGeneral combined - example

- Menus

There are three menus involved in creating a combined section:select subsection ,orientation and connection pointcorrect subsection

location (displayed starting with the second subsection)main menu

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Select subsection

Section type:

Select on of the following:any steel section from the current tableany existing property group that is a steel sectiondefine a plate

Angle:

Reference point:

The reference point can be selected at any corner or the mid point of any line (except for round sections). Forexample:



Correct location

Dx, Dy :

Move the new subsection relative to the reference point. For example this allows a gap to be defined betweenthe sections:

Combined/new section reference point:

Select new reference points for the current combined section and the subsection just added or the subsectionselected.

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Main menu

Major axis direction:

The

I section represents the section as displayed and the section will align with the x2 axis as shown inthe option, i.e. in the example above:

Note that the in unsymmetric sections the larger side is always placed in the positive axis direction, i.e. thesection would be oriented in the model in the same way even if the section were defined with the larger flangeat the bottom.

Use the Local axes option to modify this default orientation.

Subsection:

Add Add a new subsection (first click "Ref. point" to select the point where the next subjection will bejoined to it). The Select subsection

menu is displayed.

Delete Delete any subsection.

Update Revise the details of any subsection; the Select subsection

menu is displayed with theexisting data for the selected subsection.

Move Move any subsection; the Correct location

menu is displayed with the existing data for theselected subsection.

Angle Revise the angle/flip for theselected subsection (can also be revised by selecting "Update").

Ref. point Select the reference point in the combined section where the next subsection will be added.

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- Example

Create the followingcombined section consistingof an I-section and a channelattached to its top flange:

select the first section:

Each section has a "reference point" denoted on the section by a . This point defines where the referencepoint of the next subsection will be joined. In our example, the reference must be at the centre of the topflange.

click Reference point

and move the

to the center of the flange and click the mouse:

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Add the channel:

select the channel, select its reference point and rotate it: :

The program displays the combined section; no corrections are necessary:



Section modification factors

Modification factorsThe area and moments-of-inertia of an property may be reduced by a factor. This open is useful when thecracked section properties of concrete members is required for the analysis. Different factors may be enteredfor A, I2, I3 and J:

The factors are also displayed in the Output - property table.

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Section property list

Property listA property list may be displayed/printed with the property names shown in the same colours as on the screendisplay:

Note:element properties are not shown.to print the table in colour, set

Use colour for printing drawings in Setup - print parameters - general



Walls

Generaladditional nodes are automatically added at the top/bottom faces of the wall when it connects to a wall witha different cross-section above or below:

OpeningsOpenings may now be defined anywhere in any wall segment (this replaces the "coupling beam" option):

One opening can be defined in each segment; the opening can be of any size and can be located anywhere inthe segment

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Note:dh is measured from the 'start' of the segment, either from the outer face if orfrom the centre:

if (dv+H) is greater than the story height, the program builds the model as follows:



Global loads - define

Global loads - point, area or pattern - applied as joint loads, may now be applied to selected nodes only.

Apply loads to selected nodesselect nodes using the standard Node selection option.

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Dynamic - eccentricities

Eccentricities Many seismic design codes stipulate that the weights be applied offset from their center of mass, i.e. at aspecified distance from the nodes.

define different "sets" of eccentricities and assign each set to an earthquake direction.For each set:

define default values that are assigned to every defined set.define different eccentricities at specific levels in the model; values defined here override the default values.

Note:all sets are solved at the same timethe levels are defined in the "Stories" option.

For example, the following sets are required for a typical model:+X1 eccentricity, X2 earthquake direction-X1 eccentricity, X2 earthquake direction+X2 eccentricity, X1 earthquake direction-X2 eccentricity, X1 earthquake direction



Enter values of eccentricity in any global direction at any level; the program will apply the eccentricity to theweights at all nodes at that level. Note that the default eccentricity will be used when a value is left blank.

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Dynamic - story calculations

Stability coefficientThe program calculates and displays the "Stability coefficient ". For example , ASCE 7-10, 12.8.7: "P-Deltaeffects on story shears and moments .... are not required to be considered where the stability coefficient ( ) ..is equal to or less than 0.10"

For example:



Soft storiesThe program identifies "Soft stories" as defined in the Code. For example, ASCE 7-10, Table 12.3.2 - "Stiffness soft story irregularity is defined to exist where there is a story in which the lateral stiffness is lessthan 70% of that in the story above or less than 80% of the average stiffness of the three stories above".

For example:

STRAP 2012 Enhancements

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