pycufsm.pre.cutwp

Functions

`prop2_new`(→ pycufsm._types.Sect_Props)	Run a CUTWP analysis using the new format for nodes and elements
`prop2`(→ pycufsm._types.Sect_Props)	Function modified for use in CUFSM by Ben Schafer in 2004 with permission

Module Contents

pycufsm.pre.cutwp.prop2_new(nodes: pycufsm._types.ArrayLike, elements: Sequence[pycufsm._types.New_Element]) → pycufsm._types.Sect_Props

Run a CUTWP analysis using the new format for nodes and elements

Args:

nodes (ArrayLike): Nodal coordinates: [[x, y], …]

Note that any extra columns (such as a third column for stresses), will simply be ignored.
elements (Sequence[New_Element]): Element definition: [{

nodes: “all”|[node1, …],

t: thickness,

mat: mat_name

}]

How the nodes are connected. The material name will be ignored.

Returns:

sect_props(Sect_Props): Dictionary of section properties

pycufsm.pre.cutwp.prop2(coord: numpy.ndarray, ends: numpy.ndarray) → pycufsm._types.Sect_Props

Function modified for use in CUFSM by Ben Schafer in 2004 with permission of Sarawit. removed elastic buckling calcs and kept only section properties.

Compute cross section properties

This function computes the cross section properties: area, centroid, moment of inertia, torsional constant, shear center, warping constant, B1_vals, B2_vals, elastic critical buckling load and the deformed buckling shape

Args:

coord (np.ndarray): node i’s coordinates: coord(i,1) = X coordinate coord(i,2) = Y coordinate
ends (np.ndarray): subelement i’s nodal information: ends(i,1) = start node # ends(i,2) = finish node # ends(i,3) = element’s thicknesses

Returns:

sect_props (Sect_Props): Dictionary of section properties:

A == cross section area xc == X coordinate of the centroid from origin yc == Y coordinate of the centroid from origin Ix == moment of inertia about centroid X axes Iy == moment of inertia about centroid Y axes Ixy == product of inertia about centroid Iz == polar moment of inertia about centroid theta == rotation angle for the principal axes I1 == principal moment of inertia about centroid 1 axes I2 == principal moment of inertia about centroid 2 axes J == torsional constant xo == X coordinate of the shear center from origin yo == Y coordinate of the shear center from origin Cw == warping constant B1 == int(y*(x^2+y^2),s,0,lengths) *BWS, x,y=prin. crd. B2 == int(x*(x^2+y^2),s,0,lengths)

where: x = x_1+s/lengths*(x_2-x_1)
y = y_1+s/lengths*(y_2-y_1) lengths = length of the element

Note: J,xo,yo,Cw,B1,B2,Pe,dcoord is not computed for close-section

Andrew T. Sarawit, Wed 10/25/01 BWS, 2004 BWS, Aug 2005: additional modifications, program only handles

singly-branched open sections, or single cell closed sections, arbitrary section designation added for other types.

BWS, Dec 2006 bug fixes to B1_vals B2_vals BWS, Dec 2015 extended to not crash on disconnected and arbitrary sections