def getFlangeBoltedPlate(self,
boltSteel,
plateSteel=ASTM_materials.A36,
lbls=None):
''' Return a suitable bolted plate for the beam flange.
:param boltSteel: steel type of the bolts that connect the plate with
the flange.
:param plateSteel: steel type of the bolted plate.
'''
flangeStrength = self.shape.getFlangeYieldStrength()
bolt = self.shape.getFlangeMaximumBolt(steelType=boltSteel)
numberOfBolts = bolt.getNumberOfBoltsForShear(flangeStrength,
numberOfRows=2,
threadsExcluded=True)
spacing = self.shape.getFlangeWidth() / 2.0
boltArray = ASTM_materials.BoltArray(bolt,
nRows=2,
nCols=int(numberOfBolts / 2),
dist=spacing)
thicknessRatio = max(self.shape.steelType.fy / plateSteel.fy,
self.shape.steelType.fu / plateSteel.fu)
plateThickness = round(
thicknessRatio * self.shape.getFlangeThickness() * 1000, 0) / 1000
retval = ASTM_materials.BoltedPlate(boltArray,
width=self.shape.getFlangeWidth(),
thickness=plateThickness,
steelType=plateSteel)
print('plate thickness: ', plateThickness * 1e3, ' mm')
return retval
def getBoltedPlateTemplate(self):
''' Return the blocks corresponding to the plate
bolted to the gusset plate.
'''
# Create bolted plate.
boltedPlate = ASTM_materials.BoltedPlate()
boltedPlate.setFromDict(self.boltedPlateTemplate.getDict())
boltedPlate.eccentricity = geom.Vector2d(.025, 0.0)
boltedPlate.length += .05
return boltedPlate
Example – Design of a Bolted Tension Bearing-Type Connection
of the course:
Design of Bolts in Shear-BearingConnections per AISC LRFD 3rdEdition (2001)
'''
in2m = 25.4e-3
kip2N = 4448.2216
import math
from materials.astm_aisc import ASTM_materials
bolt = ASTM_materials.BoltFastener(0.75 * in2m,
steelType=ASTM_materials.A325) # group A
boltArray = ASTM_materials.BoltArray(bolt, nRows=2, nCols=2)
boltedPlate = ASTM_materials.BoltedPlate(boltArray,
thickness=20e-3,
steelType=ASTM_materials.A36)
Pd = 121.6 * kip2N
CFShear = boltArray.getDesignShearEfficiency(Pd, doubleShear=True)
CFCenterDist = boltArray.checkDistanceBetweenCenters()
CFthickness = boltedPlate.checkThickness(Pd)
minPlateWidth = boltedPlate.getMinWidth()
ratio1 = abs(CFShear - 0.85024866348) / 0.85024866348
ratio2 = abs(CFCenterDist - 0.762) / 0.762
ratio3 = abs(CFthickness - 0.867667222586) / 0.867667222586
'''
print('Pd= ', Pd/1e3, 'kN')
print('CF(Shear)= ', CFShear)
print('dist. : ', boltArray.dist*1e3, 'mm')
print('CF(center dist.)= ', CFCenterDist)
ratio2= abs(F_flange-2908e3)/2908e3 ## Maximum bolt diameter. db= shape.getFlangeMaximumBoltDiameter() tmpBolt= ASTM_materials.getBoltForHole(db) ratio3= (tmpBolt.getName()=='M24') bolt= ASTM_materials.BoltFastener(tmpBolt.diameter, steelType= ASTM_materials.A490) ## Estimate number of bolts. N= bolt.getNumberOfBoltsForShear(1.25*F_flange, numberOfRows= 2, threadsExcluded= True) nRows= 2 nCols= N/nRows boltArray= ASTM_materials.BoltArray(bolt, nRows, nCols, dist= None) flangeAsBoltedPlate= ASTM_materials.BoltedPlate(boltArray, width= shape.getFlangeWidth(), thickness= shape.getFlangeThickness(), steelType= shape.steelType) ## Gross section yielding load and net section fracture load flangeNetSectionFractureLoad= flangeAsBoltedPlate.getNetSectionFractureLoad() flangeGrossSectionYieldingLoad= flangeAsBoltedPlate.getGrossSectionYieldingLoad() ratio4= abs(flangeGrossSectionYieldingLoad-1656.207e3)/1656.207e3+abs(flangeNetSectionFractureLoad-1666.98e3)/1666.98e3 ## Check local buckling lambda_hd_flange= shape.getLambdaHDFlange() flange_buckling_check= shape.flangeLocalBucklingCheck(highlyDuctile= True) lambda_hd_web= shape.getLambdaHDWeb(N= 0.0, M= Mpr) web_buckling_check= shape.webLocalBucklingCheck(N= 0.0, M= Mpr,highlyDuctile= True) ratio5= abs(lambda_hd_flange-7.35)/7.35 ratio6= abs(lambda_hd_web-59.0)/59.0 ## Bolted plate.
