Materials

Materials

Pre-Analysis Tab

Concrete and steel grades are assigned to each member type from the Pre-Analysis tab page in the Building Analysis Form.


Unit Weight of Member
Unit Weight of Concrete given in this field is used for calculating the self-weight of columns, walls, beams, slabs and foundations.

Unit Weight of Blocks
Unit Weight of Blocks is used in calculating the self-weight of the filler blocks used in ribbed slabs. 

From this page press the Edit Materials button in the Material field.



Material grades in ProtaStructure are taken from the Codes. You can easily define a new grade using  the Add or "+" button. 

By default, two sets of material are predefined :
  1. Default Materials – used for all superstructure storeys members (Storey 1 and above)
  2. Foundation Floor – used for foundation members modelled in Sotrey 0

There is option to add “Storey Having Different Material” if there is a need define specific storey members to have different materials.

Material can also defined for each member individually by selecting a member > right-click > Edit Section/Material.

Selecting a Concrete Grade

ProtaStructure allows you to select different concrete grades for different member types. You can define concrete grades for columns, beams, slabs, ribbed slabs and foundations separately.

To select a concrete grade for a member type, you press the button next to the member type label to display the Concrete Grades List. After selecting a grade you can check the “Apply to all member types” option to use the same grade for all member types.

If you want to define a new concrete grade, press the “Add” or "+" button. Similarly, you can delete an existing grade by selecting it in the table and pressing the “Delete” or "X" button.

Fields on the Concrete Grades List are editable. You can select any cell to enter a new value.
In the Concrete Grades List, the characteristic strength is:
  1. Cube strength of the concrete for British Standard Code template
  2. Cylinder strength of the concrete for Eurocode and ACI code template.
For the analysis and design of members, the design strength for a given material is derived from the characteristic strength divided by the Material Factor. The Material factor is defined in the Material Coeff field.
The Modulus of Elasticity of the concrete grades are calculated using the formula Ec = Ko + 0.2 fcu.
After selecting a concrete grade, you can close the form by clicking the “OK” button.

Selecting a Steel Grade

ProtaStructure allows you to select different steel grades for different member types. You can define steel grades for Truss, Purlin, Girt and Brace Members separately.

To select a steel grade for a member type, you press the button next to the member type label to display the Steel Grades List.

If you want to define a new steel grade, press the “Add” or "+" button. Similarly, you can delete an existing grade by selecting it in the table and pressing the Delete” or "X" button.

Fields on the Steel Grades List are editable. You can select any cell to enter a new value.

In the Steel Grades List, the design strength for a given material is derived from the characteristic strength divided by the Material Factor. The Material factor (Safety Factor) is defined in the Material Coeff field.
After selecting a steel grade, you can close the form by clicking the OK button.

Selecting a Reinforcement Bar Grade

ProtaStructure allows you to select different steel grades for different member types. You can define the steel grades for columns, beams, slabs, ribbed slabs, foundations and links separately.
For example, if you want to use “Grade 460-Type2” for the whole system, and Grade 485-Fabric for slabs, you can easily select this here.
To select a steel grade for a member type, you can press the button next to the member type label to display the Steel Grades List. After selecting a grade you can check the “Apply to all member types” option to use the same grade for all member types.

If you want to define a new steel grade, press the “Add” button. Similarly, you can delete a grade by selecting it in the table and pressing the “Delete” button.

Fields on the Steel Grades List are editable. You can select any cell to enter a new value.

In the Steel Grades List, the characteristic yield strengths of the steel grades are given. For the analysis and design of members, the design strength for a given material is derived from the characteristic strength divided by the “Material Factor”. The Material factor is defined in the “Material Coeff” field.

After selecting a steel grade, you can close the form by clicking the “OK” button.

If the “Rib Type” of a steel grade is "Type 0", then these bars will automatically have hooks at the ends. If you don’t want hooks at bar ends, you can remove the check in the “Hook” column, thus providing straight bars.


Properties of Hook

Determining Bars Sizes to be used

In the Materials page, next to each Member Type Steel button there are “Rebar Diameters” buttons. If you click a “Rebar Diameters” button you will see a list of available bar sizes.
If you untick "Use" against a bar, then for the selected steel grade, this diameter will not be used for the selected member type in the project.

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