**Question 7.18**A sandstone bed with a Rock Quality Designation (RQD) of 70% and a unit weight (γ) of 26.0 kN/m³ lies beneath 1.5 meters of overburden soil. A 2.0 m × 2.0 m square foundation is to be placed on top of the sandstone rock (i.e., at a 1.5 m depth below the ground level) to carry a column load. The unit weight of the soil is 18.0 kN/m³. Assuming the rock strength parameters from Problem 7.17, calculate the required specifications for the foundation. The text reads:"Determine the maximum load that can be allowed on the foundation with the safety factor FS = 3. The compressive strength \( f'_c \) of concrete is 30.0 MN/m²."This section appears to be focusing on calculating the permissible load on a concrete foundation given a safety factor and the material's compressive strength.

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7.18 A sandstone bed with RQD = 70% and y = 26.0 kN/m³ lies beneath 1.5 m of overburden soil. A 2.0 m × 2.0 m square foundation is to be placed on top of the sandstone rock (i.e., at a 1.5 depth below the ground level) to carry a column load. The unit weight of the soil is 18.0 kN/m³. Assuming the rock strength parameters from Problem 7.17,

7.18 A sandstone bed with RQD = 70% and y = 26.0 kN/m³ lies beneath 1.5 m of overburden soil. A 2.0 m × 2.0 m square foundation is to be placed on top of the sandstone rock (i.e., at a 1.5 depth below the ground level) to carry a column load. The unit weight of the soil is 18.0 kN/m³. Assuming the rock strength parameters from Problem 7.17,

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Calculation of Settlement

The vertical displacement of the structural foundation due to the loading from the superstructure is known as settlement. It is due to the reduction of air voids present in the soil. The amount of vertical displacement depends on the bearing capacity of the soil on which the foundation is laid. The effect of the settlement depends on the magnitude of settlement, uniformity, and the structural design of the structure. The maximum allowable settlement for residential and office buildings should be less than 18 mm, for industrial buildings, it is 38 mm and for commercial buildings, it is 25 mm.

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"Determine the maximum load that can be allowed on the foundation with the safety factor FS = 3. The compressive strength \( f'_c \) of concrete is 30.0 MN/m²."

This section appears to be focusing on calculating the permissible load on a concrete foundation given a safety factor and the material's compressive strength.

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A circular foundation 2m in diameter is shown in the figure below. A normallyconsolidated clay layer 5m thick is located below the foundation. Determine the consolidation settlement of the clay. 1- method 2:1 2- consolidation settlement Cc method
A sandstone bed with RQD = 70% and y = 26.0 kN/m³ lies beneath 1.5 m of overburden soil. A 2.0 m X 2.0 m square foundation is to be placed on top of the sandstone rock (i.e., at a 1.5 depth below the ground level) to carry a column load. The unit weight of the soil is 18.0 kN/m³. Assuming the rock strength parameters from Problem 7.17,
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4. A square foundation will be constructed at ground surface. The subsoil profile is shown in the figure below. The mat will have a net uniform load of 500 psf at El. O. The mat will have a net uniform load (Induce stress) at El. -15 of 360 psf, the primary consolidation settlement (in.) of the clay layer directly below the center of the foudnation is? fr ORIGINAL GROUND SURFACE ELEV. O ft ELEV-5 ft. ELEV-10 ft ELEV-20 ft 30 ft SAND Y = 115 pcf MAT FOUNDATION SAND Y = 105 pcf GROUNDWATER TABLE NORMALLY CONSOLIDATED CLAY SATURATED UNIT WEIGHT = 95 pcf COMPRESSION INDEX C₂ = 0.29 VOID RATIO=1.0