1.3.12 Normal definitions of beams and shells

Product: ABAQUS/Standard  

Elements tested

B21    B21H    B22    B22H    B23    B23H    B31    B31H    B31OS    B31OSH    B32    B32H    B32OS    B32OSH    B33    B33H   

PIPE21    PIPE21H    PIPE22    PIPE22H    PIPE31    PIPE31H    PIPE32    PIPE32H   

S4    S4R    S4R5    S8R    S8R5    S9R5    STRI3    STRI65   

Problem description

Material:

Linear elastic, Young's modulus = 30 × 106.

Boundary conditions:

End A is clamped, at end C.

Loading:

25.0 at end C.

Section properties:

0.25, 0, 1.0 × 106, 0.01041667.

For B23, B23H, B33, B33H, and STRI3 elements, different values of are used: vertical members, 5.208 × 10–3, horizontal members, 1.0 × 10–6.

For pipe elements a circular cross-section of outer radius 0.5 and wall thickness 0.05 is used. Five pipe elements are used along segment AB. A single linear beam element is used along BC with section properties as defined above.

Remarks

Normal definitions written to the output file by the analysis input file processor are all correct.

Reference solution

Displacements: .

For shear flexible elements properties have been defined such that the first term is negligible.

For Love-Kirchhoff (cubic) elements the second term does not apply.

Results and discussion

Element Type (ABAQUS) (Analytical)
B21(H)5.098 × 10–55.098 × 10–5
B22(H)5.098 × 10–55.098 × 10–5
B23(H)6.662 × 10–36.667 × 10–3
B31(H)5.098 × 10–55.098 × 10–5
B31OS(H)5.098 × 10–55.098 × 10–5
B32(H)5.098 × 10–55.098 × 10–5
B32OS(H)5.098 × 10–55.098 × 10–5
B33(H)6.662 × 10–36.667 × 10–3
PIPE21(H)2.166 × 10–32.199 × 10–3
PIPE22(H)2.167 × 10–32.199 ×10–3
PIPE31(H)2.166 × 10–32.199 × 10–3
PIPE32(H)2.167 × 10–32.199 × 10–3
S45.098 × 10–55.098 × 10–5
S4R5.098 × 10–55.098 × 10–5
S4R55.098 × 10–55.098 × 10–5
S8R5.098 × 10–55.098 × 10–5
S8R55.098 × 10–55.098 × 10–5
S9R55.098 × 10–55.098 × 10–5
STRI3 6.341 × 10–36.667 × 10–3
STRI65 3.991 × 10–55.098 × 10–5

Due to the lack of symmetry for triangular meshes, the displacements at the nodes that are at point B differ slightly. The maximum values are documented here.

Input files

eb22gxs8.inp

B21 elements.

eb2hgxs8.inp

B21H elements.

eb23gxs8.inp

B22 elements.

eb2igxs8.inp

B22H elements.

eb2agxs8.inp

B23 elements.

eb2jgxs8.inp

B23H elements.

eb32gxs8.inp

B31 elements.

eb3hgxs8.inp

B31H elements.

ebo2gxs8.inp

B31OS elements.

ebohgxs8.inp

B31OSH elements.

eb33gxs8.inp

B32 elements.

eb3igxs8.inp

B32H elements.

ebo3gxs8.inp

B32OS elements.

eboigxs8.inp

B32OSH elements.

eb3agxs8.inp

B33 elements.

eb3jgxs8.inp

B33H elements.

ep22pxs8.inp

PIPE21 elements.

ep2hpxs8.inp

PIPE21H elements.

ep23pxs8.inp

PIPE22 elements.

ep2ipxs8.inp

PIPE22H elements.

ep32pxs8.inp

PIPE31 elements.

ep3hpxs8.inp

PIPE31H elements.

ep33pxs8.inp

PIPE32 elements.

ep3ipxs8.inp

PIPE32H elements.

ese4sgs8.inp

S4 elements.

esf4sgs8.inp

S4R elements.

es54sgs8.inp

S4R5 elements.

es68sgs8.inp

S8R elements.

es58sgs8.inp

S8R5 elements.

es59sgs8.inp

S9R5 elements.

es63sgs8.inp

STRI3 elements.

es56sgs8.inp

STRI65 elements.