Question

A long strip footing foundation $1 \mathrm{~m}$ wide is to be designed for a region where earthquakes could occur. The soil underlying the area has a unit weight equal to $17 \mathrm{kN} / \mathrm{m}^3$, an angle of internal friction equal to $20^{\circ}$, and a cohesion valoe c equal to $25 \mathrm{kPa}$. Assume that the footing will be installed at a depth of $1 \mathrm{~m}$ below the adjaceat soil surface, that the soil rigidity index is greater than the critical index, and that the depth factors do not apply. For the condition where $k_k$ equals 0.20 and $k_k$ is half of $k_k$ compare the value for static ultimate bearing capacity (Equation $I_{\text {a) }}$ with the value for seismic bearing capacity (Equation 24 and Figure 20). For this problem, do not use a factor of safety when making the comparisen.

   A long strip footing foundation $1 \mathrm{~m}$ wide is to be designed for a region where earthquakes could occur. The soil underlying the area has a unit weight equal to $17 \mathrm{kN} / \mathrm{m}^3$, an angle of internal friction equal to $20^{\circ}$, and a cohesion valoe c equal to $25 \mathrm{kPa}$. Assume that the footing will be installed at a depth of $1 \mathrm{~m}$ below the adjaceat soil surface, that the soil rigidity index is greater than the critical index, and that the depth factors do not apply. For the condition where $k_k$ equals 0.20 and $k_k$ is half of $k_k$ compare the value for static ultimate bearing capacity (Equation $I_{\text {a) }}$ with the value for seismic bearing capacity (Equation 24 and Figure 20). For this problem, do not use a factor of safety when making the comparisen.
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Essentials of soil mechanics and foundations : basic geotechnics
Essentials of soil mechanics and foundations : basic geotechnics
David F. McCarthy 7th Edition
Chapter 14, Problem 34 ↓

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5\gamma BN_\gamma$, where: $c' = c(1 + 0.2D_{\text{f}}) = 25(1 + 0.2(1)) = 30 \text{ kPa}$ $N_c = \frac{N_q}{N_c} = \frac{\tan^2(45 + \frac{\phi}{2})}{\tan^2(45)} = \frac{\tan^2(45 + \frac{20}{2})}{\tan^2(45)} = 5.07$ $N_q =  Show more…

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A long strip footing foundation $1 \mathrm{~m}$ wide is to be designed for a region where earthquakes could occur. The soil underlying the area has a unit weight equal to $17 \mathrm{kN} / \mathrm{m}^3$, an angle of internal friction equal to $20^{\circ}$, and a cohesion valoe c equal to $25 \mathrm{kPa}$. Assume that the footing will be installed at a depth of $1 \mathrm{~m}$ below the adjaceat soil surface, that the soil rigidity index is greater than the critical index, and that the depth factors do not apply. For the condition where $k_k$ equals 0.20 and $k_k$ is half of $k_k$ compare the value for static ultimate bearing capacity (Equation $I_{\text {a) }}$ with the value for seismic bearing capacity (Equation 24 and Figure 20). For this problem, do not use a factor of safety when making the comparisen.
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