A proposed building column will carry a maximum downward unfactored load combination is 250 kips and a service load of 185 kips. The column is to be supported on a square footing at a depth of 7 ft. in silty sand with the following engineering properties: y=119 lb/ft³ above the groundwater table and 122 lb/ft³ below, c'=0, o'= 32°, and Neo-30. The groundwater table is 15 ft. below the ground surface. The allowable settlement 8, is 0.75 inches The ASD factor of safety is 2.5. Determine the design of the footing width clearly identifying if it is controlled by settlement or hearing capacity

A proposed building column will carry a maximum downward unfactored load combination is 250 kips and a service load of 185 kips. The column is to be supported on a square footing at a depth of 7 ft. in silty sand with the following engineering properties: y=119 lb/ft³ above the groundwater table and 122 lb/ft³ below, c'=0, o'= 32°, and Neo-30. The groundwater table is 15 ft. below the ground surface. The allowable settlement 8, is 0.75 inches The ASD factor of safety is 2.5. Determine the design of the footing width clearly identifying if it is controlled by settlement or hearing capacity

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

Design criteria for structural loading

The different loads such as loads due to self-weight (dead load) and external loads such as live load, wind loads, seismic load, snow load, and other loads and load combinations that influence the design of a building are called structural loading. The nature of the applied load differs from changes in the location, design, and type of materials used. The design criteria require that structures must be designed and constructed to be able to withstand all load types that are expected to act upon the structure and render its usage for the designated purpose. The structural members such as beams, slabs, columns, and foundations help the structure to withstand the applied load. There are different institutes such as ASCE and ACI that provide building design codes to assure minimum safety requirements and quality of the structures.

Question

A proposed building column will carry a maximum downward unfactored
load combination is 250 kips and a service load of 185 kips. The column is
to be supported on a square footing at a depth of 7 ft. in silty sand with the
following engineering properties: y=119 lb/ft³ above the groundwater table
and 122 lb/ft³ below, c'=0, '= 32°, and Neo-30. The groundwater table is
15 ft. below the ground surface. The allowable settlement da is 0.75 inches.
The ASD factor of safety is 2.5. Determine the design of the footing width
clearly identifying if it is controlled by settlement or bearing capacity.

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Step 1: Mention the given data:

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Step 2: Determine the size of footing:

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Step 3: Calculation of soil reaction:

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Step 4: Calculation for depth of footing:

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Step 5: Calculation of Minimum depth:

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