Moment Curvature Curve

Display the moment-curvature relationship to consider the inelastic capacity of the generated cross-section.

Moment-curvature curve is calculated based on the nonlinear material properties defined in the Material Data dialog box. If the nonlinear material is not defined, the moment-curvature curve will be calculated based on the rectangular stress distribution for concrete from Eurocode2-1-1:2004 clause 3.1.7 and the bilinear stress-strain relationship for rebar and steel.

From the Main Menu select Results > Moment Curvature Curve.

Click Moment Curvature Curve in the Icon Menu.

Moment-Curvature Curve dialog box

Curve Options

Neutral Axis Angle: Enter the angle of neutral axis for which moment-curvature curve is calculated.

Axial Load, P: Enter the initial axial force.

Maximum Strain: Enter the ultimate strain value of the summation between Comp. Strain and Tens. Strain.

Moment-Curvature Table

Steel Comp. Strain: Structural steel strain at the extreme compression fiber

Concrete Strain: Concrete strain at the extreme compression fiber

Neutral Axis Depth: Distance from the neutral axis to the extreme compression fiber

Steel Tens. Strain: Structural steel strain in the extreme tension fiber

Rebar Strain: Maximum reinforcement strain among the reinforcements in tension

Curvature: Rotation per unit length of member (Curvature, phi = (compressive strain + tension strain) / effective depth)

Moment: Bending moment of the cross-section

Moment-Curvature for Crack, Yield, and Ultimate Point

Crack :  Display the values at the time when the concrete starts cracking.

Yield(Initial) : Display the values at the time when either concrete or steel yields. The yield criteria of concrete and steel are defined in the Nonlinear Properties of the Material Data dialog box.  

Yield : Display the values at the time when both concrete and steel yield. The yield criteria of concrete and steel are defined in the Nonlinear Properties of the Material Data dialog box.

Note

The values above may not be defined depending on the types of hysteresis curves. In such case, ”0” will be displayed.

Ultimate : Display the values at the time when the strain reaches the ultimate strain. The ultimate strain is defined in the Nonlinear Properties of the Material Data dialog box. If the nonlinear material properties are not defined, ultimate strain is determined based on the entered value in the Maximum Strain field.

Strain Diagram

Strain diagram is displayed for each point. It is updated based on the mouse curser position on the Moment-Curvature graph in real time.

Report

Click to generate the report in Microsoft Excel format. The generated excel file is saved in the same folder as the one that the *.mgs model file has been saved.