Two springs are used to support the steel truss structure of 2.5 m height shown in the figure. The spring at the right support has a shear modulus of elasticity of 300 GPa (plus last two digits of your ID No. GPa), spring diameter of 20 mm, and a 50 mm helical radius at 3 turns. On the other hand, the spring at the left support has a shear modulus of elasticity of 200 GPa (plus last two digits of your ID No. GPa), spring diameter of 25 mm, and a 50 mm helical radius at 6 turns. When the loads are applied in the structure, determine the following: 1) Reactions (kN, kN-m) of 5 m height column fixed support if both springs have shrinkage clongation of 5mm (plus quarter of the last digit of your ID No. mm):
Two springs are used to support the steel truss structure of 2.5 m height shown in the figure. The spring at the right support has a shear modulus of elasticity of 300 GPa (plus last two digits of your ID No. GPa), spring diameter of 20 mm, and a 50 mm helical radius at 3 turns. On the other hand, the spring at the left support has a shear modulus of elasticity of 200 GPa (plus last two digits of your ID No. GPa), spring diameter of 25 mm, and a 50 mm helical radius at 6 turns. When the loads are applied in the structure, determine the following: 1) Reactions (kN, kN-m) of 5 m height column fixed support if both springs have shrinkage clongation of 5mm (plus quarter of the last digit of your ID No. mm):
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
Right support:
Elasticity= 374 Gpa
Left support:
Elasticity= 274Gpa
Elongation= 9mm
Answer item 1 only.
Transcribed Image Text:Two springs are used to support the steel truss structure of 2.5 m height shown in the figure. The
spring at the right support has a shear modulus of elasticity of 300 GPa (plus last two digits of your
ID No. GPa), spring diameter of 20 mm, and a 50 mm helical radius at 3 turns. On the other hand,
the spring at the left support has a shear modulus of elasticity of 200 GPa (plus last two digits of your
ID No. GPa), spring diameter of 25 mm, and a 50 mm helical radius at 6 turns. When the loads are
applied in the structure, determine the following:
1) Reactions (kN, kN-m) of 5 m height column fixed support if both springs have shrinkage
clongation of 5mm (plus quarter of the last digit of your ID No. mm);
2) Axial stress (MPa) of member a if the material has a diameter of 100 mm at 5 mm thick, and
state whether compression or tension;
3) Strain (mm/mm) of the concrete column i1 ine required compressive strength at 28 days
curing is 25 MPa considering 400 mm diameter concrete section;
4) Number of bolts in one circular arrangement when column is spliced at mid-height at 300
mm radius from center of column material to the center of cach bolted conncction if cach bolt
has 35 kN resisting load capacity; and
5) Shear flow (kN/m) of the column using 5 mm thick steel with a 300 mm radius.
Note: usc moment at column fixed support as torsio-l moment applicd in the column structure.
Transcribed Image Text:30KN
20 kN
10kN
45KN
20 kN
4 panels at 3m
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