Page 393 - Marine Structural Design

Chapter 19 Simplified Fatigue Assesment 369

A: Longitudinal Cracked
B: Fiat Bar Cracked
C: Shell Plate to WeWFloor Weld Cracked
C1: Type C Crack Extending into Shell Plate
D Web Frame (Cutout) Cracked
E: Bracket Cracked

Longitudinal
LFlat Bar
Stiffener

.Bracket
Shell Plate
-Web Frame or
Double Boitom Floor

Figure 19.2 Different Types of Cracks around Cutout Openings

The coefficient, cs , can be easily determined as following:
= 1 .O for symmetrical longitudinal stiffeners;
CS
= 1.41 for unsymmetrical longitudinal stiffeners with one-sided support.
CS
cs = 1.12 for unsymmetrical longitudinal stiffeners with two-sided supports.

Figure 19.3 Pressure on Shaded Area Goes into Web Frametfloor
Different (Ma et a1 2000)