def pointOnsetCracking(self):
'''return the calculated (strain,stress) point of the concrete diagram where cracking starts. It's obtained as
the intersection of the straight line thas reproduces the linear-elastic range in tension (before cracking) with
the regression line that approaches the exponential decay curve adopted for the post-cracking range
'''
rgLin = self.regresLine()
r1 = geom.Recta2d(geom.Pos2d(rgLin['interceptX'], 0.),
geom.Pos2d(0, rgLin['interceptY']))
r2 = geom.Recta2d(geom.Pos2d(0., 0.),
geom.Pos2d(self.f_ct / self.E_ct, self.f_ct))
pInt = r1.getIntersectionWithLine(r2)[0]
return {'eps_ct': pInt.x, 'ft': pInt.y}
def getFoundationPlane(self): ''' Returns the foundation plane.''' v= geom.Vector2d(0.0,-self.footingThickness/2.0) toeEndPos= self.getWFToeEndPosition()+v heelEndPos= self.getWFHeelEndPosition()+v return geom.Recta2d(toeEndPos,heelEndPos)
def getFootingMidPlane(self): ''' Returns the midplane of the footing.''' toeEndPos= self.getWFToeEndPosition() heelEndPos= self.getWFHeelEndPosition() return geom.Recta2d(toeEndPos,heelEndPos)