![]() ![]() The moment of inertia is a property of a body that determines how much moment is required for it to bend about an axis. Since section modulus is calculated from the moment of inertia, let’s take a look at the moment of inertia. Thus, the keel plate may comprise multiple strakes, and each strake contributes its own to the final section modulus of the entire section. The section modulus of the entire midship section is an aggregate of the section moduli of all the longitudinal strength members. For section modulus calculation, only longitudinal members are considered (plates stiffeners, girders, etc which run along the length of the vessel), and transverse members like frames are not included. These structural members are plates, stiffeners, girders, frames, etc. How do we conceive of it as a beam? A beam has a solid cross-section, while the midship section has multiple structural members, with most part hollow. What does the ‘Section Modulus’ of midship mean? Looking at the typical structural section of a ship, it looks like this: ![]() Please read our article on longitudinal strength for more.Īpplying the same principle to a ship, the bending stress of the ship at its midship will be given by:īending Stress = Bending Moment at midship/Section modulus of Midship The ship is subject to loads of weight and buoyancy, and the net load distribution along the length is used to give the shear force and bending moment distribution along the length. The ship’s longitudinal strength is assessed by taking it analogous to a simply supported beam. ‘Y ext’ is the distance of the neutral axis of the beam to the topmost point in the beam’s section, and Y ext = h/2 (see figure below) Looking at a beam of width b and thickness h, the section modulus for bending about the horizontal axis through its centroid tis given byīasically, the formula for Section Modulus of a beam is Z = I/Y ext, where I is the geometric moment of inertia of the beam about the horizontal axis passing through its centroid and is given by If we look into a simple beam that is bending under a load, section modulus is a geometric property of the beam’s cross-section which is also a direct measure of the beam’s strength under the bending load. ![]() Now we focus on the other parameter – Section Modulus. Here, the bending moment is calculated from a detailed procedure as described in our other article – Longitudinal Strength for Ships. The bending stress experienced by the midship section of the vessel is calculated from the standard bending stress formulaīending Stress = Bending Moment/Section Modulus To assess how much of the bending moment (hog and sag) the vessel can tolerate, it is important to assess the structural strength of the mid-ship section as a whole. It represents the most critical structural parameter of the vessel – its global strength. Gibbs Timber Frame prides itself on providing a reliable, personal and professional service.The mid-ship section of a ship is a defining structural drawing of the vessel. Combined with our manufacturing experience, flexibility is an added benefit to our customers. Our design service provides timber frame design and engineering solutions to precise requirements. Our affiliated structural engineers and designers ensure our components are manufactured to the highest standards. All our timber frames conform to current building regulations and we provide all relevant structural calculations and certificates as required by regulatory authorities. Our manufacturing facility of 26,000 sq ft in Porchfield, Isle of Wight operates under rigorous quality control standards. Our expertise ranges from luxury detached homes, specialized structures, bungalows, chalets, terrace housing, apartment blocks, commercial buildings as well as home extensions. This enables our customers to concentrate on the prime elements of construction and leaving us to quantify materials and organize deliveries when requested. Our timber frame package has been a great service for self-builders, developers and building contractors alike. Coupled with our manufacturing facility we offer an erection service giving our customers reassurance and peace of mind. Our timber frames are designed and manufactured to suit each individual project. Utilizing over twenty years experience in the construction industry, we provide a fast, efficient and personal service. Gibbs Timber Frame are manufacturers of high quality timber frame structures. Gibbs Timber Frame : high quality timber frame structures on the Isle of Wight and South Coast ![]()
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