Predications

Of The Sectional EffectsThe supposing of the weight

distrubition as w(x) and the bouyancy distrubition as b(x).For the structural

equilibrium, these two components of ship’s moments, have to be balance on a

fixed or stabilized point.That means:The first equation

shows that, the weight and buoyancy is equal to each other.The second formula

demostrates that, the weight’s and buoyancy’s moments taken by the Xo point.If

these sitations are not providing, the structure is not in equilibrium and

while to become in equilibrium state, the trim and the position of the draft is

going to be in change.In there, the supposing of the w(x) and b(x) is in fixed

position for making the analysis.But that hypothesis can not give guarantee for

the local stability between the weight and buoyancy.This situation, generates

the balanced load dispersion on the all of ship lenght and this effectuates the

shear forces and bending moments on the structural plate.When the examination

of the situation that arises in the terms of strength, the model of the ship as

beam that under the effects of the weight and buoyancy. ?ekil

23: The

quasi-static forces actiong on ship structre and their affects. ?ekil 24:The

first step of the solving this problem is making the calculations for finding

the unbalanced force q(x) that along of the ship lenght.This is the difference

between buoyancy and weight.The

investigation of the Q(x) shear force and M(x) bending moments on any part of

beam that constituted by the not counterpoised force could done with the

agreement of the balance between reactions on the beam and the loads on the

beam.This

acceptance, specifies that the integral of the unstable force affects on the

beam and the shear force at any point of the structure is going to be

equal.Secondly,the moments of the forces acting on a fixed point on beam must

be in equality. The bending moment will taken from the partial integration of

the integral.

The

mentioned beam’s calculations for gathering the datas about the shear force and

the bending moment equilibrium must be done for each 3 situational process.According

to the datas, the characteristics of the

structure shows the differences for each analysis.After the determination of

the beam effects consequences the longitudinal strength of the ship will be

computing.The measurements of the longitudinal strength provides the shear

stress calculations and comparisons for the limiting criterias.