Theory referenceΒΆ Coordinate system and sign convention Coordinate system Sign conventions Section calculator General concept Compute bending strength Compute Moment-curvature relation Compute NM interaction domain Compute MNN interaction domain Compute MM interaction domain Compute strain profile for given external forces Section integrators General concept Fiber integrator Marin integrator Linear elastic material Elastic-plastic material Bilinear compression Parabola rectangle UserDefined constitutive law