Stability calculations pdf

Images Donate icon An illustration of a heart shape Donate Ellipses icon An illustration of text ellipses. Stability and trim for the ship's officer Item Preview.

EMBED for wordpress. Want more? Advanced embedding details, examples, and help! Aboard today's vessels, technology and computers abound as ship's gear. The once long and tedious calculations for stability, trim, and hull strength are now done in minutes.

But no matter how much change the industry has undergone, the laws of physics are constant. The only way to verify that the computer is coming up with accurate figures is to read the ship's drafts. The appendix has also been updated to include the Stability Data Reference Book: August Edition, which is the same supplied in the United States Coast Guard license examination room Includes index Includes bibliographical references and index Prerequisites for stability, trim, and hull strength calculations -- What is stability?

Coast Guard questions on stability, trim, and longitudinal hull strength -- Appendix A. Stability data reference book -- Appendix B. Useful stability and trim formulas -- Appendix E. Conversion factors and useful information for stability and trim calculations -- Appendix F.

Slope stability analysis by using limit equilibrium method in 2d and 3d shows two dimensional limit equilibrium methods will always estimate lower factors of safety compared to three-dimensional methods.

Slope side effect should be considered in 3D limit equilibrium methods to produce more realistic simulation of the problem. Side resistance using the at-rest earth pressure coefficient should be considered can produce lower bound 3D factors of safety while using the active earth pressure coefficient can produce upper bound factor of safety.

Upstream side slope stability under sudden drawdown condition by computer programming shows the effect of horizontal drains on upstream slope of earth fill dams during rapid drawdown using finite elements and limit equilibrium methods. Changing of pore water pressure, outpouring seepage flow and factor of safety are inspected.

By using Geo studio [2]. The study shows that stability of the dams depends on its geometry, materials properties and the forces to which it is subjected. Following are steps for used Geo studio software. Annual The effect of variation in width of berm on factor of safety is as discus below and existing soil properties are as shown in Table 2 and properties of Anchors and nails are as shown in Table 3. Figure 3. The change in factor of safety for downstream side with respect to variation in berm width for existing dam section and relative factor of safety after providing variation in number of anchors and nails for strengthening of existing dam section with variation in length was computed and as shown in Table 4.

From the above graph it was observed that the factor of safety deceases with decreasing in berm width. Various trials were performed to achieve design factor of safety by strengthening of dam with anchors and nails. The results obtained by considering the strengthening with anchor and nail for various berm widths are as shown Figure Table V. Computer base stability analysis is gives us fast result but basic data required such as soil properties as well as properties and availability of strengthening material such as anchoring and nailing and other are to be calculated manually.

This is very advantageous for comparative calculation of analysis by computer base and traditional method. Variation in width of berm on upstream and downstream side of dam section is directly affected on factor of safety.

It is conclude that by changing the berm width of earth dam the factor of safety can be restored by anchoring and nailing. The effect of anchoring and nailing on factor of safety is as shown in graph.

Anchoring and nailing is not so effective in water impounded area of dam section. As per USBR recommends for earth dam section of 6m height required minimum 3m berm. By using software results less than 3m width berm with strengthening is not so satisfactory. There is no such improvement in increment of factor of safety. A thesis,