Wang et al 2020e - Revision history

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NengC: NengC moved page Draft Neng 860713149 to Wang et al 2020e

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NengC moved page Draft Neng 860713149 to Wang et al 2020e

NengC: /* 3.2 Discussion */

2020-10-28T06:00:26Z

‎3.2 Discussion

NengC at 05:48, 28 October 2020

2020-10-28T05:48:13Z

NengC at 05:45, 28 October 2020

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NengC at 03:52, 28 October 2020

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NengC at 03:47, 28 October 2020

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 '''Effects of water depth.''' To evaluate the effects of water depth on the mechanical behaviors of SCT installation pipe and SCT displacements, five different water depths were selected ranging from 600''m'' to 1400''m'' in this research. The deformations of the SCT installation pipe in different water depth are shown as in Figure 10(a). Both the minimum and maximum deformations of the installation pipe increase with water depth. As the maximum bending stress of the installation pipe locates at the upper area of the pipe, shown as in Figure 6, this research analyzed the bending stress distribution of areas above the installation pipe. Figure 10(b) shows the bending stress distribution of the installation pipe at upper areas in different water depth. The bending stress of the installation pipe decrease gradually with water depth.
-[[Image:Draft_Neng_860713149-image10.png|534px]]
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 '''Effects of wet weight of SCT. '''To evaluate the effects of SCT wet weight on the mechanical behaviors of installation pipe and SCT displacements, five different SCT were selected ranging from 200''kN'' to 400''kN'' in this research. Figure 11(a) shows the deformations of the SCT installation pipe in different SCT wet weight while Figure 11(b) shows the bending stress distribution of the installation pipe at upper areas in different SCT wet weight. Both deformations and bending stress of the installation pipe decrease with SCT wet weight, which indicate that SCT weight neutralize the deformations and bending stress of the installation pipe.
-[[Image:Draft_Neng_860713149-image11.png|528px]]
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 '''Effects of SCT installation pipe specification. '''To evaluate the effects of SCT installation pipe specification on the mechanical behaviors of installation pipe and SCT displacements, five different installation pipes (4''in'', 4 1/2''in'', 5''in'', 5 1/2''in'' and 6 5/8''in'') were selected in this research. The displacements of the pipe rarely change with water depth when choosing smaller installation pipe (4''in'', 4 1/2''in'' and 5''in''), shown as in Figure 12(a). However, the displacement of SCT installation pipe increases significantly when larger size installation pipe (5 1/2''in'' and 6 5/8''in'') were used in SCT installation process. Similarly, the bending stress of the pipe increase with pipe’s specification when larger installation pipes were selected.
-[[Image:Draft_Neng_860713149-image12.png|534px]]
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 Fig. 12 Mechanical behaviours of the pipe in different SCT installation pipe</div>

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 The SCT is attached at the bottom end of the installation pipe. The velocity of ocean water is much small at deep water and the effects of ocean wave and current on the installation pipe can be ignored. The inclination slop and shearing force at bottom end equal to zero. Then, the boundary conditions at bottom end can be expressed as,
-<div style="text-align: right; direction: ltr; margin-left: 1em;">
+{| class="formulaSCP" style="width: 100%; text-align: center;"
-<math display="inline">\left\{ \begin{matrix}{\left. {\left. \theta \right| }_{z=L}=\frac{\partial x}{\partial z}\right| }_{z=L}=0\\{\left. {\left. Q\right| }_{z=L}=\frac{{\partial }^{3}x}{\partial {z}^{3}}\right| }_{z=L}=0\end{matrix}\right.</math>                                      （7）</div>
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 Here, ''θ'' is the inclination slop of installation pipe, ''Q'' is shearing force loaded on the installation pipe.

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 The SCT is attached at the bottom end of the installation pipe. The velocity of ocean water is much small at deep water and the effects of ocean wave and current on the installation pipe can be ignored. The inclination slop and shearing force at bottom end equal to zero. Then, the boundary conditions at bottom end can be expressed as,
-<div style="text-align: right; direction: ltr; margin-left: 1em;">
+{| class="formulaSCP" style="width: 100%; text-align: center;"
-<math display="inline">\left\{ \begin{matrix}{\left. {\left. \theta \right| }_{z=L}=\frac{\partial x}{\partial z}\right| }_{z=L}=0\\{\left. {\left. Q\right| }_{z=L}=\frac{{\partial }^{3}x}{\partial {z}^{3}}\right| }_{z=L}=0\end{matrix}\right.</math>                                      （7）</div>
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 Here, ''θ'' is the inclination slop of installation pipe, ''Q'' is shearing force loaded on the installation pipe.

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