LIST OF FIGURES
FIGURE NUMBER
LEGEND
PAGE NUMBER
1
General View of Point Pleasant Bridge
4
2a
View of Bridge from Ohio End, with Locations of Typical Details to be shown in Figs. 2b - 2d
5
2b
Typical Detail of Truss to Chain Connection
6
2c
Typical Detail of Eyebars Chain and Hanger Connection
7
2d
Detail of Expansion Joint at Connection of Truss to Chain Bent Post
8
3
Logic Framework for Conduct of Investigation
14
4
Master Chart for Location of Laboratory Specimens
26
5a
Group "A" Specimens
27
5b
Group "B" Specimens
28
5c
Group "C" Specimens
29
5d
Group "D" Specimens
30
5e
Group "E" Specimens
31
6
Variation of Hardness through Thickness of Eyebars Materials (NBS Photo)
33
7
Small Semi-circular Crack (upper left of photo) which existed prior to Fracture in Eyebars No. 330 (NBS Photo)
33
8
Micro Structure of Eyebars Material
(a) Outer Surface
(b) Martensite at 0.2" depth
(c) Interior
35
9
Location of Burr on Eyebars No. 33 (NBS Photo)
36
10
Detail of Burr on Eyebars No. 33 after Polishing and Etching (NBS Photo)
36
- iv -