A column 18 in. square, with f. = 4 ksi, reinforced with eightNo. 8 (No. 25) bars of f, = 60 ksi, supports a dead load of 225 kips and a live load of 175 kips.The soil (fill) has a unit weight of 100 pcf. The allowable soil pressure q, is 5 kips/ft?. Designa square footing with base 5 ft below grade, using f = 4 ksi and f,60 ksi.

Step-1: Determining of net allowable soil pressure (qo): Step-2: Determination of footing size:…

Answered: A column 18 in. square, with f. = 4…

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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7. A continuous strip footing bears on sand with groundwater one-half the footing width below the base of the footing. Which of the following changes will Increase the allowable bearing pressure? D B/2 PFT B SAND A) Embedment depth remains D, but the footing width is decreased. B) Embedment depth remains D, but the groundwater is raised to B/4 below the base of the footing. C) Embedment depth and groundwater remain D and B/2, but the unit weight of the sand is increased. D) Groundwater remains at B/2 below the base of the footing, but the embedment depth is decreased.
A structural engineer wants to consider placing the base of the building so deep that the soil below will not experience any additional load. They asked you to design a fully compensated mat foundation under the entire building. They has determine that the plan view of the building will be 65 ft by 65 feet. and the building will weighs 10,790 kips. The clayey soil beneath the site has a cohesion of 418 psf and the unit weight of the soil is 118 pcf. How deep will they have to place the structure to fully compensate for the weight of the building.
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.
Q.6 A column 12" square with fe' = 5 ksi reinforced with 8 #10 bars of fy= 60 ksi, supports a service load of 91.87 kips (factored load=113.17 kips). The allowable soil pressure is 3.904 k/ft. Design a square footing with base 5' below surface. Take unit weight of soil as 100 psf. (14)
?CE
1) Design a rectangular footing for an 16” square corner Column with PDL = 280 kips and PLL = 180 Kips. Make the length of the long side about 1.5 the width of the short side. Fy = 60 ksi F’o= 4000 psi for both, column and footing. Assume the base of the footing is 4'-6" below grade and the depth of the footing is 26". The soil weight is 100 PCF. (Normal weight concrete, No epoxy coating, The Column is reinforced with eight #8 bars.) Need to design for load transfer from the Column to the foating. Need to Show the development length for the dowels. Need to design the bars for footing at both directions. Need to check if the bars fit the footing based on the development legth. Need to show two-way footing Spacing diagram.

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