For a civil engineer, it is of primary importance to customize the checkings performed on element forces or displacements.

NextFEM Designer allows to handle and checks some defined quantities on nodes/elements by means of user-defined formulas.

To checks the nodes/elements the following procedure has to be done:

- choose a quantity to check from the
*quantities*drop-down list; - Choose a load case and a time/mode (or select ALL for all times/modes);
- Import the formulas from a customized
**.txt*file (see chapter 4); - Click on the
*Perform checks*

The results are shown on the *Output* window and can be exported in text format by clicking on the *Exportâ€¦* button.

It is possible to customize the list of verifications with the notation described in the following.

Formulas can be written using the following operators/functions:

Addition: **+
**Subtraction:

**–**

Multiplication:

*****

Division:

**/**

Modulo:

**%**

Exponentiation:

**^**

Less than:

**<**

Less than or equal:

**<=**or

**â‰¤**

More than:

**>**

More than or equal:

**>=**or

**â‰¥**

Equal:

**==**

Not Equal:

**!=**or

**â‰**

Sine:

**sin**

Cosine:

**cos**

Arcsine:

**asin**

Arccosine:

**acos**

Tangent:

**tan**

Cotangent:

**cot**

Arctangent:

**atan**

Arccotangent:

**acot**

Natural logarithm:

**loge**

Common logarithm:

**log10**

Logarithm:

**logn**

Square root:

**sqrt**

The hardcoded variables are:

**Frame forces verifications****A**: Area**Jx**: Moment of Inertia around x-axis**Jy**: Moment of Inertia around y-axis**Jt**: Torsional Inertia**D**: Diameter of circular cross sections**b**: Base for any other cross sections**h**: Height for any other cross sections**tw**: web thickness**tf1**: thickness of bottom flange**tf2**: thickness of upper flange**t**: thickness for planar sections**N**: Axial force**Vy**: Shear force along y direction**Vz**: Shear force along z direction**Mt**: Twisting moment**Myy**: Moment around y local axis**Mzz**: Moment around z local axis

**Displacements****dx**: nodal displacement in X direction**dy**: nodal displacement in Y direction**dz**: nodal displacement in Z direction**rx**: nodal rotation around X axis**ry**: nodal rotation around Y axis**rz**: nodal rotation around Z axis