OpenSeesPy Sub-Stepping Methods

Project and Purpose

OpenSeesPy Sub-Stepping is a helpful package when your system is huge.
There are 4 sequential divisions(/2, /4, /8, /16). From v0.1.2.0 user can define the substepping factors.

DispControlSubStep(Nsteps:int , IDctrlNode:int, IDctrlDOF:int, Dmax:float, fac1=2, fac2=4, fac3=8, fac4=16, LoadConstandTimeZero=False)
LoadControlSubStep(Nsteps:int, Lincr:float, fac1=2, fac2=4, fac3=8, fac4=16, LoadConstandTimeZero=False)

How to use

Download via pip. The only requirement is OpenSeesPy library.

pip install OpenSeesPySubStepping

Find the project release @Pypi.org

Versions

v0.1.2.0

Substepping factors can be modified be the user.
Note: Default substepping factors are 1/2, 1/4, 1/8, 1/16

v0.1.1.2

Add description to pypi.org
Update REAME.md with example
Example folder
Add github workflow in order to publish library to pypi.org

Example

import openseespy.opensees as ops
from OpenSeesPySubStepping import DispControlSubStep
from OpenSeesPySubStepping import LoadControlSubStep


def main():
    """
    Create a Cantilever Problem
    """

    ops.wipe()
    ops.model('basic', '-ndm', 2, '-ndf', 3)
    height = 5.0
    nElem = 20

    ElemLength = height / nElem
    nodeID = []
    Ycoord = 0
    for i in range(nElem + 1):
        nodeID.append(i)
        ops.node(i, 0.0, Ycoord)
        Ycoord += ElemLength
    IDctrlNode = i

    ops.fix(0, 1, 1, 1)
    ops.geomTransf('Linear', 1)

    concrete = 'Concrete04'
    steel = 'Steel02'

    matTAGConc = 319
    matTAGSteel = 312
    fcc = -20000
    ec2c = -0.002
    ecu2c = -0.0035
    Ec = 30000000
    fct = 2200
    et = 0.001
    fy = 500000
    E0 = 200000000
    b = 0.01
    ops.uniaxialMaterial(concrete, matTAGConc, fcc, ec2c, ecu2c, Ec, fct, et)
    ops.uniaxialMaterial(steel, matTAGSteel, fy, E0, b, 20, 0.925, 0.15, 0, 1, 0, 1, 0)

    # Core Fibers
    ops.section('Fiber', 105)
    ops.patch('rect', 319, 11, 11, -0.20, -0.20, 0.20, 0.20)
    # Cover Fibers
    ops.patch('rect', 319, 15, 2, 0.250000, 0.200000, -0.250000, 0.250000)
    ops.patch('rect', 319, 15, 2, 0.250000, -0.250000, -0.250000, -0.200000)
    ops.patch('rect', 319, 2, 11, -0.250000, -0.200000, -0.200000, 0.200000)
    ops.patch('rect', 319, 2, 11, 0.200000, -0.200000, 0.250000, 0.200000)
    # create corner bars
    ops.layer('straight', 312, 4, 0.00025450, 0.200000, 0.200000, -0.200000, 0.200000)
    ops.layer('straight', 312, 4, 0.00025450, 0.200000, -0.200000, -0.200000, -0.200000)
    ops.beamIntegration('Lobatto', 100, 105, 3)

    for i in range(len(nodeID) - 1):
        ops.element('forceBeamColumn', i, nodeID[i], nodeID[i + 1], 1, 100, '-iter', 10, 1e-6)

    # Add Vertical Load at Top
    ops.timeSeries('Linear', 101)
    ops.pattern('Plain', 100, 101)
    ops.load(IDctrlNode, 0, -500, 0)

    # Solve Gravity First
    ops.system('UmfPack')
    ops.numberer('Plain')
    ops.constraints('Transformation')
    ops.integrator('LoadControl', 0.1)
    ops.test('RelativeTotalNormDispIncr', 0.001, 100, 2)
    ops.algorithm('Newton')
    ops.analysis('Static')
    LoadControlSubStep(10, 0.1, True)

    # Displacement Control Analysis(Pushover)
    ops.pattern('Plain', 200, 101)
    ops.load(IDctrlNode, 1, 0, 0)
    ops.system('UmfPack')
    ops.numberer('Plain')
    ops.constraints('Transformation')
    ops.test('RelativeTotalNormDispIncr', 1e-2, 500, 2)
    ops.algorithm('Newton')
    ops.analysis('Static')
    DispControlSubStep(100, IDctrlNode, 1, 1.0)


if __name__ == '__main__':
    main()

License

iammix/OpenSeesPy-Substepping-Methods

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