*SetBeam() - rectangular cross section
Sets the properties of a beam rectangular cross section.
Syntax
*SetBeam(beam_name, RECTANGULAR, len|AUTO_LENGTH, 
                                        E,      G,
                                        P2 Dim, P3 Dim, 
                                        asy,    asz,
                                        CRATIO, ratio)
    Arguments
- beam_name
 - The variable name of an existing beam.
 - RECTANGULAR
 - This argument indicates the cross section of the beam is rectangular.
 - len
 - len specifies the undeformed length of the beam.
 - AUTO_LENGTH
 - AUTO_LENGTH indicates that the undeformed length of the beam is calculated automatically using the end points of the beam.
 - E
 - The Young's modulus of elasticity.
 - G
 - The shear modulus of elasticity.
 - P2 Dim
 - The length of the side along the Y axis.
 - P3 Dim
 - The length of the side along the Z axis.
 - asy
 - The correction factor for the shear deflection along the Y axis.
 - asz
 - The correction factor for the shear deflection along the Z axis.
 - CRATIO
 - This argument indicates the structural damping matrix is the ratio of the stiffness matrix.
 - ratio
 - Ratio for calculating the damping matrix.
 
Example
*Beam( bm_1, "Beam 1", b_dummy1, b_dummy2, 
 p_beam1, p_beam2)
*SetBeam(bm_1, RECTANGULAR, 1000, 
 2.0e+05, 7.6e+04, 10, 
 5, 0, 0, CRATIO, 0.01)