The load model was established based on outline, the hull solid model was designed based on hull rule, the calculation studio of hull portrait flexibility was developed taking advantage of graphic condition, and the hull portrait flexibility was calculated by graphics integral.

Study on longitudinal strength calculation method of hull standing above an explosion bubble;

Resaerch for damage mode that reduce longitudinal strength of service bulk carriers;

The checking method of longitudinal strength for ships using deflections of ships;

In the paper, the background to research a standard-type of truck roll-on/roll-off ship navigating in upper Yangtze river and San Gorge Reservoir and the determination of both loads for calculating general longitudinal strength and the ratios of dimensions L/D and B/D are briefly presented, the effect of double bottom and general arrangement on the general longitudinal strength is analyzed.

The rupture in the middle of bulk cargo is due to the corrosion and fatigue of components in long term usage, which leads the sec tion modulus to reduce and the general longitudinal strength to weaken.

Analyze and conclusion is made to the particular of this type of vessel when investigating the overall longitudinal strength of different type of caisson less than the length 190m.