3 Type “Gridwork”

The gridwork consists of two systems of parallel beams with equidistant distances in both x and y directions and rigidly connected at their points of intersection. The beams are supported at the ends, and the load is applied in the direction of the normal to the xy plane. If the distances a₁ and a₂ between the beams are small in comparison with the dimensions a and b of the grid, and if the flexural rigidity of each of the beams parallel to the x axis is equal to I₁ and that of each of the beams parallel to y axis is equal to I₂, the coefficients are as follows:

Properties

Category	Property	Description / Notes
Flexure / beam / CSS lib	beam, 1 / Cross section	E1, E2... E modulus [ MPa ] I1, I2 ... Moment of inertia [ m4 ] It1, It2 ... Torsion moment of inertia [ m4 ] Az1, Az2 ... Effective surface for shear [ m2 ] G1, G2 ... G modulus [ MPa ]
	beam, 1 / Beam spacing, a1 [m]
	beam, 2 / Cross section
	beam, 2 / Beam spacing, a2 [m]
Flexure / beam / input	beam, 1 / Material 1
	beam, 1 / Width of beam, t1 [mm]
	beam, 1 / Depth of beam, h1 [mm]
	beam, 2 / Material 1
	beam, 2 / Width of beam, t1 [mm]
	beam, 2 / Depth of beam, h1 [mm]
Flexure	D11 [MN/m]
	D12 [MN/m]
	D22 [MN/m]
	D33 [MN/m]
	D44 [MN/m]
	D55 [MN/m]
Membrane	Effective height, hx [mm]	Effective height of slab in "x" direction for membrane behavior
	Effective height, hy [mm]	Effective height of slab in "y" direction for membrane behavior
	Material	Material of slab
	d11 [MN/m]
	d22 [MN/m]
	d12 [MN/m]
	d33 [MN/m]