A square footing is to be constructed as shown in the Figure below. The design load, Qdesign is 92,000 pounds. The depth to the base, D₁ = 4 feet. The subsoil consists of a uniform deposit of soft, loose soil, and the data are provided below. Determine the dimension of the footing, B if a factor of safety of 3.7 is used.

A square footing is to be constructed as shown in the Figure below. The design load, Qdesign is 92,000 pounds. The depth to the base, D₁ = 4 feet. The subsoil consists of a uniform deposit of soft, loose soil, and the data are provided below. Determine the dimension of the footing, B if a factor of safety of 3.7 is used.

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter16: Soil Bearing Capacity For Shallow Foundations

Section: Chapter Questions

Problem 16.14P: Redo Problem 16.13 with the following data: gross allowable load = 184,000 lb, = 121 lb/ft3, c = 0,...

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Load and resistance factor design

Load and resistance factors design (LRFD), also known as Limit state design (LSD), refers to the design method used in building engineering. A boundary condition is a condition of a structure where it can no longer meet the relevant design requirements. The condition may refer to the load level or other actions on the structure, while the terms refer to the integrity of the structure, suitability for use, durability, or other design requirements. A structure designed for LRFD is limited to keeping track of all possible actions during its design time and is always ready for use, with the appropriate level of reliability in each boundary condition. LRFD-based construction codes clearly define the appropriate levels of reliability in their instructions.

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A strip footing carries a load 14506 lbs per foot of length. The footing has a width of 2.3 ft. Determine the increase in vertical stress directly below the center of the footing at a depth of 0.8 ft. Provide your answer in psf, to 2 decimal place. Do not include units in your response.
1. A 4ft by 4ft spread footing is proposed where the bottom of footing is set 2ft below grade. The column bearing on this footing will impose a load of 180kips. Assuming the subsurface conditions shown below with groundwater 5ft below grade, Use Schmertman's method to calculate the elastic settlement of the system 6 years after construction is completed, provide a clear sketch and show units and state assumptions. Oft Sand Ymoist = 120 pcf Phi = 30deg Es = 52 ksf 4ft Loose Sand 5ft Ymoist = 125 pcf Yat = 145 pcf Phi = 22deg Es (above GW) = 30 ksf Es (below GW) = 20 ksf 8ft Dense Sand Ysat = 155 pcf Phi = 35deg Es = 60 ksf 20ft 2. The foundation above is limited to a 1.5" settlement after 10 years, speak to whether the design is adequate and if not how can you adjust the project to meet this criteria.
For the strip footing shown in the figure below. Calculate ney allowable bearing capacity of the foundation shown in the figure below Note: The foundation is strip footing with width of 4m. Assume a factor of safety = 3.0
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2. Compute the following: Compute the following: (4) a. Effective stress before loading. b. Induced stress and effective stress after loading at the edge of the footing c. Compute effective stress if ground water table was at the same level as ground level. d. Calculate new Induced stress and effective stress after loading at the edge of the footing. 10° 10 30' 30⁰ Width = 10ft, q = 2000 psf Sand ym= 110 pcf ysat = 125 pcf ** Clay ysat = 100 pcf Gravel ysat = 130 pcf Pt. B Pt. C Pt. A O t
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A structural engineer finished a design of a library. They determine that each column will carry 1000 lbs. the soil beneath the footing has the properties: gamma= 130 pcf, c= 75psf, phi= 40 degrees. The groundwater table is of great depth so it’s no concern. Sketch figures. What is the minimum size of the footing for a factor of safety of 3? Case 1: assume square footing Case 2: assume round footing
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only HANDWRITTEN answer needed ( NOT TYPED)
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