This technical report covers the analysis & findings for the COLLAPSE OF THE HYATT REGENCY WALKWAYS 1981

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Mechanics of Materials
(CASE STUDY)
Investigation & Analysis for the
Collapse of the Kansas City Hyatt Regency Walkways (1981)
APPENDIX
Group Members (ME-05 B)
Ali Faizan Wattoo NUST201305057BSMME
Farhan Ellahi NUST201304475BSMME
Muhammad Umair Qazi NUST201305329BSMME
Gohar Shoukat NUST201305490BSMME
Usama Zaid Malik NUST201304802BSMME
Submitted to
Dr. Irfan-Ul-Haq
Dr. Amir Mubashir

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8-APPENDIX
8.1 FINITE ELEMENT ANALYSIS USING SOLIDWORKS
In order to validate our theoretical results we simulated the fabricated design on SOLIDWORKS
using Finite Element Analysis in order to get von mises stresses and factor of safety plot. The
fabricated design was constructed and necessary conditions were applied with following
assumptions
8.1.1 Walkway Model

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8.1.2 Study Properties
Study name Static 1
Analysis type Static
Mesh type Solid Mesh
Thermal Effect: On
Thermal option Include temperature loads
Zero strain temperature 298 Kelvin
Include fluid pressure effects from SolidWorks
Flow Simulation
Off
Solver type Direct sparse solver
Inplane Effect: Off
Soft Spring: Off
Inertial Relief: Off
Incompatible bonding options Automatic
Large displacement Off
Compute free body forces Off
Friction Off
Use Adaptive Method: Off
Result folder SolidWorks document (C:UsersGoharDesktop)
8.1.3 Units
Unit system: SI (MKS)
Length/Displacement mm
Temperature Kelvin
Angular velocity Rad/sec
Pressure/Stress N/m^2

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8.1.4 Material Properties
Model Reference Properties Components
Name: Alloy Steel
Model type: Linear Elastic
Isotropic
Default failure
criterion:
Max von Mises
Stress
Yield strength: 6.20422e+008
N/m^2
Tensile strength: 7.23826e+008
N/m^2
Elastic modulus: 2.1e+011 N/m^2
Poisson's ratio: 0.28
Mass density: 7700 kg/m^3
Shear modulus: 7.9e+010 N/m^2
Thermal expansion
coefficient:
1.3e-005 /Kelvin
SolidBody 1
(Boss-Extrude2)(Rods-1),
SolidBody 1
(Boss-Extrude2)(Rods-2)
Curve Data:N/A
Name: ASTM A36 Steel
Model type: Linear Elastic
Isotropic
Default failure
criterion:
Max von Mises
Stress
Yield strength: 2.5e+008 N/m^2
Tensile strength: 4e+008 N/m^2
Elastic modulus: 2e+011 N/m^2
Poisson's ratio: 0.26
Mass density: 7850 kg/m^3
Shear modulus: 7.93e+010 N/m^2
SolidBody 1(Boss-Extrude1)
(bridge assembly-
1/rectangular beam-1),
SolidBody 1
(Boss-Extrude1)(bridge
assembly-1/rectangular
beam-2),
SolidBody 1(Boss-Extrude1)
(bridge assembly-
2/rectangular beam-1),
SolidBody 1(Boss-Extrude1)
(bridge assembly-
2/rectangular beam-2)
Curve Data:N/A

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8.1.5 Mesh Information
Mesh type Solid Mesh
Mesher Used: Curvature based mesh
Jacobian points 4 Points
Maximum element size 0 mm
Minimum element size 0 mm
Mesh Quality High
Remesh failed parts with incompatible mesh Off
Mesh Information - Details
Total Nodes 19657
Total Elements 8971
Maximum Aspect Ratio 49.337
% of elements with Aspect Ratio < 3 8.82
% of elements with Aspect Ratio > 10 37.6
% of distorted elements(Jacobian) 0
Time to complete mesh(hh;mm;ss): 00:00:10
Computer name: GOHAR_SHOUKAT

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Name Type Min Max
Stress1 VON: von Mises Stress 1.30328 N/mm^2 (MPa)
Node: 5044
1157.26 N/mm^2 (MPa)
Node: 15516
Figure 1 Isometric View of Beam showing the von Mises Stresses

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Name Type Min Max
Displacement1 URES: Resultant Displacement 0 mm
Node: 1
5.41336 mm
Node: 19277
Main Assembly-Static 1-Displacement-Displacement1
Name Type Min Max
Strain1 ESTRN: Equivalent Strain 3.23153e-006
Element: 2855
0.002067
Element: 8770
Main Assembly-Static 1-Strain-Strain1

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Name Type Min Max
Factor of Safety1 Automatic 0.216027
Node: 15516
313.295
Node: 132
Main Assembly-Static 1-Factor of Safety-Factor of Safety1FIGURE 4
FIGURE 5 Region of Maximum Stress

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Isometric Sectional View of the Region of
Failure
Stresses in the Bottom Floor of the Structure

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Equivalent Strain Diagram showing the deformation caused by the loading
condition created in the bolt connectors
Zoomed in view of Figure 3 showing the removal of nut from the bolt

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Front View of the undeformed beam showing the applicable stresses
Isometric View of the Box Beam depicting the possible deformation
leading to failure

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FIGURE 13 Stresses in Hanger Rods
FIGURE 12 STRESS DIAGRAM SHOWING FAILURE IN THE STRUCTURE

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THE END