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ABSTRACT

In recent decades, the scarcity of natural resources is a major global concern In particular, the lack of land due to the explosion of world population, along with the excessive increase of industrial parks and the process of urbanization has put enormous pressure on countries The challenge, which requires researchers to find a solution and the Very Large Floating Structures (VLFS) has been proposed

In this master thesis, the Finite element method (FEM) is extended to cooperate with the boundary element method (BEM), namely, the BEM-FEM This method is applied to compute hydroelastic responses of a pontoon type very large floating structure (VLFS) under wave action and also subjected to a moving load The floating structure and the surrounding fluid are discretized by 9-node isoparametric finite elements (FE) and By 9-node constant boundary elements (BE), respectively Structural analysis is based on 0LQGOLQ¶V plate theory Then the Nemark integration method is employed to solve the equation of motion for structural system

The numerical example part of the thesis is simulated by Matlab software The results are verified with the results of previous studies and commercial structural software Then, the plate is surveyed when changing important factors such as the arrangement of stiffness reinforcement, velocity of concentrated moving load, depth of the seabed The results show displacement and drag force The displacement of the plate to decrease when the plate is reinforced The comparisons show very good agreement

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DANH MӨ&&È&%ҦNG BIӆU xvi

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+uQK Ĉӗ thӏ FKrQKOӋch chuyӇn vӏ giӳDWUѭӡng hӧSNK{QJJLDFѭӡQJYjJLDFѭӡQJJkQYӟLEѭӟFJkQWKHRSKѭѫQJx PEѭӟFJkQWKHRSKѭѫQJ y WKD\ÿәi tӯ 5m, 10m, 15m, 20m, 30m 83

+uQK Ĉӗ thӏ FKrQKOӋch chuyӇn vӏ cӵFÿҥi giӳDWUѭӡng hӧSNK{QJJLDFѭӡng YjJLDFѭӡQJJkQYӟLEѭӟFJkQWKHRSKѭѫQJx OjPEѭӟFJkQWKHRSKѭѫQJy WKD\ÿәi tӯ 5m, 10m, 15m, 20m, 30m 83

+uQK Ĉӗ thӏ FKrQKOӋch chuyӇn vӏ giӳDWUѭӡng hӧSNK{QJJLDFѭӡQJYjJLDFѭӡQJJkQYӟLEѭӟFJkQWKHRSKѭѫQJx WKD\ÿәi 5m, 10m, 15m, 20m, PEѭӟFJkQWKHRSKѭѫQJy NK{QJÿәi 5m 84

+uQK Ĉӗ thӏ FKrQKOӋch chuyӇn vӏ max giӳDWUѭӡng hӧSNK{QJJLDFѭӡQJYjJLDFѭӡQJJkQYӟLEѭӟc JkQ WKHRSKѭѫQJx WKD\ÿәi 5m, 10m, 15m, PPEѭӟFJkQWKHRSKѭѫQJy NK{QJÿәi 5m 84

Trang 14

+uQK Ĉӗ thӏ FKrQKOӋch chuyӇn vӏ max giӳDWUѭӡng hӧSNK{QJJLDFѭӡQJYj

JLDFѭӡQJJkQYӟLEѭӟFJkQSKѭѫQJx WKD\ÿәi 5m, 10m, 15m, 20m, PEѭӟFJkQSKѭѫQJy NK{QJÿәLPYjQJѭӧc lҥi 85

+uQK Ĉӗ thӏ chuyӇn vӏ theo thӡi gian cӫa tҩPFyEѭӟFJkQJLDFѭӡQJSKѭѫQJ

x YjSKѭѫQJy OjPNKLYұn tӕFWKD\ÿәi 86

x OjPYjSKѭѫQJy OjPNKLYұn tӕFWKD\ÿәi 87

x OjPYjSKѭѫQJy OjPNKLYұn tӕFWKD\ÿәi 90+uQK ChuyӇn vӏ cӵFÿҥi cӫDFiFWUѭӡng hӧSEѭӟFJkQx cӕ ÿӏQKYjy WKD\ÿәi

khi vұn tӕFWKD\ÿәi 91+uQK Ĉӗ thӏ chuyӇn vӏ theo thӡi gian cӫa tҩPFyEѭӟFJkQJLDFѭӡQJSKѭѫQJ

x OjPYjSKѭѫQJy OjPNKLYұn tӕFWKD\ÿәi 95+uQK ChuyӇn vӏ max cӫDFiFWUѭӡng hӧSEѭӟFJkQy cӕ ÿӏQKYjx WKD\ÿәi khi

vұn tӕFWKD\ÿәi 96+uQK BiӇXÿӗ sӵ WKD\ÿәLÿӝ VkXYQJO}PNKLYұn tӕc tҧi trӑQJWKD\ÿәi theo

QJKLrQFӭu cӫa Takizawa [53] 97+uQK BiӇXÿӗ sӵ WKD\ÿәi bӅ rӝQJYQJO}PNKLYұn tӕc tҧi trӑQJWKD\ÿәi theo

QJKLrQFӭu cӫa Takizawa [53] 97

Trang 15

+uQK Ĉӗ thӏ chuyӇn vӏ tҥi vӏ WUt giӳa tҩm JLDFѭӡQJEѭӟFJkQx OjPy Oj

P YjNK{QJJLDFѭӡng khi vұn tӕFWKD\ÿәi 98

+uQK Ĉӗ thӏ chuyӇn vӏ tҥi vӏ WUt giӳa tҩm JLDFѭӡQJEѭӟFJkQx OjPy OjP YjNK{QJJLDFѭӡng khi vұn tӕFWKD\ÿәi 98

+uQK Ĉӗ thӏ chuyӇn vӏ tҥi vӏ WUt giӳa tҩm JLDFѭӡQJEѭӟFJkQx OjPy OjP YjNK{QJJLDFѭӡng khi vұn tӕFWKD\ÿәi 99

+uQK Ĉӗ thӏ chuyӇn vӏ tҥi vӏ WUt giӳa tҩm JLDFѭӡQJEѭӟFJkQx OjPy OjP