Section 4 Calculation of deflection
Clasification Society 2024 - Version 9.40
Clasifications Register Guidance Information - Guidance Notes for the Classification of Special Service Craft – Calculation Procedures for Composite Construction, July 2013 - Chapter 5 Design of Stiffening Members - Section 4 Calculation of deflection

Section 4 Calculation of deflection

4.1 The deflection is calculated from Pt 8, Ch 3, Pt 8, Ch 3, 1 General of the Rules for Special Service Craft. From the tabulation the overall section stiffness is (EI)s = 5200996 Ncm4/mm2

4.2 The limiting span/deflection ratio is given in Table 7.2.1 Limiting span/deflection ratio in Pt 8, Ch 7 of the Rules for Special Service Craft and typically for a bottom longitudinal (not in the slamming zone) the ratio required is 150.

Span/deflection ratio = length/mid-point deflection
  = 1000/1,7
  = 588 hence acceptable.
Parent topic: Chapter 5 Design of Stiffening Members
Copyright 2022 Clasifications Register Group Limited, International Maritime Organization, International Labour Organization or Maritime and Coastguard Agency. All rights reserved. Clasifications Register Group Limited, its affiliates and subsidiaries and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Clasifications Register'. Clasifications Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Clasifications Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract.