Clasification Society Rulefinder 2020 - Version 9.33 - Fix
Common Structural Rules - Common Structural Rules for Bulk Carriers and Oil Tankers, January 2019 - Part 1 General Hull Requirements - Chapter 9 Fatigue - Section 4 Simplified Stress Analysis - 1 General

1 General

1.1 Application

1.1.1

This section defines the procedure for a simplified stress assessment which is to be used to evaluate the fatigue strength of the longitudinal stiffener end connections.

1.1.2

The hot spot stress ranges and hot spot mean stresses in way of each end connection of longitudinal stiffener, as shown in Figure 2 are to be evaluated at the flange of the longitudinal stiffener in the following locations:
  1. Transverse webs or floors other than those located
    • At transverse bulkhead including swash bulkhead of cargo hold or
    • In way of stool, such that additional hot spot stress due to the relative displacement is not to be considered.
  2. Transverse webs or floors located
    • At transverse bulkhead including swash bulkhead of cargo hold or
    • In way of stool,

      such that additional hot spot stress due to the relative displacement are to be considered.

Stress concentration factors due to unsymmetrical stiffener geometry according [5.1] and due to the stiffener end connection geometry at point ‘A’ and ‘B’ according to [5.2] are to be applied.

1.2 Assumptions

1.2.1

The following assumptions are made in the fatigue assessment for longitudinal stiffener end connections:
  1. The hot spot stress is based on:
    • Nominal stresses.
    • Stress concentration factors given in [5].
    • Loading conditions specified in Ch 9, Sec 1, [6].
  2. The longitudinal stiffener end connection types are described in [5.2].
1.2.2

The end connections given in [5.2] are based on typical joint geometry under axial and lateral loadings. When a structural detail is different from those shown in Table 4, a finite element analysis is to be used to demonstrate the adequacy of the detail in terms of fatigue strength, according to [5.3].

Parent topic: Section 4 Simplified Stress Analysis
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