A 4-T crane is used to lift a 3m x 1.2m x 200mm pre-cast panel. A preader beam is needed to ensure the proper distribution of load in the lifting chains. Consider modulus of elasticity, E=200,000 MPa, allowable shearing stress of lifting pin is 50 MPa, the steel plate used in the spreader beam has an allowable bearing stress of 40 MPa. (All measurement in the figure is in millimeters)
A 4-T crane is used to lift a 3m x 1.2m x 200mm pre-cast panel. A preader beam is needed to ensure the proper distribution of load in the lifting chains. Consider modulus of elasticity, E=200,000 MPa, allowable shearing stress of lifting pin is 50 MPa, the steel plate used in the spreader beam has an allowable bearing stress of 40 MPa. (All measurement in the figure is in millimeters)
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:A 4-T crane is used to lift a 3m x 1.2m x 200mm pre-cast
panel. A preader beam is needed to ensure the proper
distribution of load in the lifting chains. Consider
modulus of elasticity, E=200,000 MPa, allowable
shearing stress of lifting pin is 50 MPa, the steel plate
used in the spreader beam has an allowable bearing
stress of 40 MPa. (All measurement in the figure is in
millimeters)
Lifting Pin
450
450
450
Spreader Beam
1200
6.25
Lifting Pin
41
Lifting Chain Spot Detail
Pre-CastPanel
2,300 Kocu.m.
Front View
Side View
Spreader Beam Cioss-Section
1. Determine the total load in kN the crane has to carry if
the lifting accessories (spreader beam, lifting chains and
hooks) has a total of 720 kgs.
2. Determine the average normal stress on each leg of
the lifting chain A and B.
3. Determine the required diameter, d in millimeters, of
the lifting pin if the allowable shearing stress must not
be exceeded. (Round to the nearest whole number)
4. Determine the required thickness t, in millimeters, of
the steel plate to be used if the allowable bearing stress
must not be exceeded. (Round to the nearest whole
number)
Transcribed Image Text:22
Lifting Pin
450
450
450
450
Spreader Beam
120
6.25
Lifting Pin
41
Lifting Chain Spot Detail
Pre-Cast Panel
2,300 Kg/cu.m.
Spreader Beam Cross-Section
Front View
Side View
Lifting Chain B
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