Grillage & Frame Analysis | LumoStruct by Lumoship

Profile Type	Layer Name Format	Example
HP (Holland Profile)	`HP[height]x[thickness]`	`HP200x10`
FB (Flat Bar)	`FB[height]x[thickness]`	`FB150x12`
T (T-Profile)	`T[web_h]x[web_t]+[flange_w]x[flange_t]`	`T300x10+150x15`

Profile Type

Layer Name Format

Example

HP (Holland Profile)

HP[height]x[thickness]

HP200x10

FB (Flat Bar)

FB[height]x[thickness]

FB150x12

T (T-Profile)

T[web_h]x[web_t]+[flange_w]x[flange_t]

T300x10+150x15

Parameter	Unit	Description
Layer dimensions	mm	Profile height, thickness, plate width
DXF coordinates	any	Automatically parsed as meters

Parameter

Unit

Description

Layer dimensions

Profile height, thickness, plate width

DXF coordinates

any

Automatically parsed as meters

General Data

Material Properties

Material

Structural Steel

Grade

E — Young's Modulus 210 000 N/mm²

f_y — Yield Strength 235 N/mm²

ρ — Density 7 850 kg/m³

Beam Profiles 0

HP Catalog (EN 10067)

or enter manually

b (mm)

t (mm)

h — Height (mm)

t — Thickness (mm)

h_web (mm)

t_w (mm)

b_f (mm)

t_f (mm)

a — Leg 1 (mm)

b — Leg 2 (mm)

t — Thickness (mm)

Effective Breadth (Attached Plate)

Stiffener PSM

Calculate b_eff by BV NR467

ℓ — Span (m)

s — Spacing (mm)

t_p,net — Plate (mm)

One side only

b_eff (calculated) 500 mm

t_p — Plate Thickness (mm)

Created Profiles:

Name	A (cm²)	Iy (cm⁴)	Wy (cm³)
No profiles created

Tip: Create beam profiles here first, then use them in the Model tab to build your grillage structure.

Model

Model maintenance

Nodes 0

X (mm)

Y (mm)

Z (mm)

ID	X (mm)	Y (mm)	Z (mm)	BC
No nodes

Beams 0

Node 1

Node 2

Section

ID	N1	N2	Section	L (mm)
No beams

Sections 0

Name	A (cm²)	Iy (cm⁴)	Wy (cm³)	Iz (cm⁴)	Wz (cm³)
No sections - create in General tab or import DXF

Quick Grillage Generator

Transverse Beams (Y direction)

Length (m)

Count

Spacing (m)

Beam

Total X: 8 m

Longitudinal Beams (X direction)

Length (m)

Count

Spacing (m)

Beam

Total Y: 4 m

Load q (kN/m)

Apply to

Support

Model Validation

Clears all nodes, elements, loads & boundaries

Boundary Conditions

Select nodes in the view and set boundary conditions. Use preset buttons for quick setup.

Current Constraints

Node	Ux	Uy	Uz	Rx	Ry	Rz
No constraints defined

Quick BC Presets

Select nodes first, then click preset

Loads

Define point loads on nodes or distributed loads on beams.

Active: LC1 - Default

Point Loads

Node	Fx	Fy	Fz (kN)	Mx	My	Mz
No loads defined

Line Loads (Distributed)

Elem	Nodes	q (kN/m)	Range
No line loads defined

Add Point Load to Selected Node

Fz (kN)

Negative = downward

Add Line Load to Selected Element(s)

q (kN/m)

Direction

Start (%)

End (%)

Negative = downward | Select multiple beams with Ctrl+Click or box select

Settings

Solver Validation

Tests the solver against 4 classic beam cases (simply supported, fixed-fixed, cantilever) with known analytical solutions. Run after any change that touches the solver to confirm results are still correct.

Material

Steel Grade

Set on the General tab

Units

Geometry, spans	m
Profile dimensions	mm
Deflection	mm
Forces, reactions	kN
Line loads	kN/m
Pressure	kN/m²
Moments	kN·m
Stress	MPa (N/mm²)

Point load Fz is a component: negative acts downward.
Line load q is a magnitude; its direction comes from the angle - 90° straight down, 0° sideways across the beam.
Reactions are reported upward positive; node coordinates are entered in mm.

Stress Limits

Normal Stress Limit (MPa)

Shear Stress Limit (MPa)

Material Library

Grade	E (GPa)	σy (MPa)
A	210	235
AH32	210	315
AH36	210	355
DH36	210	355

Grid Settings

Grid Size X (m)

Grid Size Y (m)

Grid Spacing (m)

Grid Origin X (m)

Grid Origin Y (m)

Color Theme

Background

Beams

Nodes

Grid Lines

Selection Highlight

Display Sizes

GEOMETRY

Beam Size 1.0x

Node Size 1.0x

Load Size 1.0x

Support (BC) Size 1.0x

LABELS

Beam Labels 1.0x

Load Labels 1.5x

Node Coords 1.0x

Results

No results yet.

Generate a model and click SOLVE.

Diagram Scale: 1.0x

Max deflection	-	mm
Max stress σ	-	MPa
Max moment	-	kN·m
Max shear	-	kN
Utilisation	-	%

Equilibrium	-
Plate slenderness	-

0 - -

Support Reactions

Node	Fz (kN)	Mx (kNm)	My (kNm)	Mz (kNm)

Top 10 Displacements

Node	Uz (mm)

Include self weight (dead load)

Steel density 7850 kg/m³, applied along each member

Load Combinations

Current: LC1 | Factor: 1.0

DXF Import Guide

Overview

Layer Naming Convention

With Attached Plate

Dimension Units

Complete Examples

AutoCAD Workflow

Import Section Geometry

Import Geometry

LumoStruct

General Data

Model

Model maintenance

Boundary Conditions

Current Constraints

Loads

Point Loads

Line Loads (Distributed)

Settings

Solver Validation

Material

Units

Stress Limits

Material Library

Grid Settings

Color Theme

Display Sizes

Results

Support Reactions

Top 10 Displacements

Load Combinations

Properties

Beam detail

Section Diagram

Confirm