N06: Diamond Shaped Frame - Geometric Nonlinear

A large diamond shape structure with two pin joints and two rigid joints is subjected to a compressive load at the two opposite corners.

Determine the load-displacement curve at the point of load application for applied load up to 40,000 lbs.

The material properties for the frame are:

Modulus of Elasticity = 30,000,000 psi

Poisson's Ratio = 0.0

Shear Modulus = 15,000,000 psi

The section properties for the frame are:

Axx = 1.0 in2

Iyy = 0.08333 m4

Izz = 0.08333 m4

In primary load case 1, point loads of 1,000 lbs each are applied at the top and bottom points of the frame.

F1 -Z = -1,000 lb

F3-Z = +1,000 lb

20 equal load increments are defined for computing the loaddeflection behavior of the structure from P = 2,000 to P = 40,000 lbs. The load-deflection option is used in defining the load combination data.

The finite element model consists of 120 beam elements and 120 joints.

Tested Features

Reference

T. J. R. Hughes and W. K. Lui,"Nonlinear Finite Element Analysis of Shells - Part II: Two Dimensional Shells", Comp. Meth. Appl. Mech. Eng., 27 (1981), 167-181.
EMRC, "NISA II Verification Problems Manual", 1991.