Q4: Use the rectangular loaded area to calculate the increase in vertical stresses at points (A) and (B) due tothe loaded area of footing. Choose figure (1) or (2).121Top viewTop viewBJ-2m-BCLAY 1CLAY 1CLAY 2A10 m X 10 m9-150 kN/m²TTTTTTINCOMPRESSIBLEFigure (1)BG.W.TCLAY 1CLAY 1CLAY 2YA'10 m X 10 m9-150 KN²INCOMPRESSIBLEFigure (2)ThmG.W.

Hi! Thank you for the question As per the honor code, We’ll answer the first question(With figure 1)…

Q4: Use the rectangular loaded area to calculate the increase in vertical stresses at points (A) and (B) due to the loaded area of footing. Choose figure (1) or (2). Top view Top view B B 10 m X 10 m 9-150 kN/m² CLAY 1 CLAY 1 CLAY 2 A 1-2m- TTTTTTTT INCOMPRESSIBLE Figure (1) B 130 G.W.T CLAY 1 CLAY 1 CLAY 2 777 7777777 YA' 10 m X 10 m 9-150 kNm² B www.stMT INCOMPRESSIBLE Figure (2) GW

Q4: Use the rectangular loaded area to calculate the increase in vertical stresses at points (A) and (B) due to the loaded area of footing. Choose figure (1) or (2). Top view Top view B B 10 m X 10 m 9-150 kN/m² CLAY 1 CLAY 1 CLAY 2 A 1-2m- TTTTTTTT INCOMPRESSIBLE Figure (1) B 130 G.W.T CLAY 1 CLAY 1 CLAY 2 777 7777777 YA' 10 m X 10 m 9-150 kNm² B www.stMT INCOMPRESSIBLE Figure (2) GW

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

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.

Question

Q4: Use the rectangular loaded area to calculate the increase in vertical stresses at points (A) and (B) due to
the loaded area of footing. Choose figure (1) or (2).
121
Top view
Top view
B
J-2m-
B
CLAY 1
CLAY 1
CLAY 2
A
10 m X 10 m
9-150 kN/m²
TTTTTT
INCOMPRESSIBLE
Figure (1)
B
G.W.T
CLAY 1
CLAY 1
CLAY 2
YA'
10 m X 10 m
9-150 KN²
INCOMPRESSIBLE
Figure (2)
Thm
G.W.

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A square footing 3 m x 3 m is supporting an axial load of 650 kN. The weight of the soil is aasumed to be 17.32 kN/m^3. Compute the vertical stress increment due to this load at a depth of 1.5 m below the center of the footing using the approximate method. a. 51.46 kPa b. 32.10 kPa c. 76.54 kPa d. 50.56 kPa
Q4 Two identical rigid foundations are given. Calculate the differential settlement ratio (8/L) after 100 days and long term after construction of the foundations. Hint: Average total final settlement of a rigid footing due to a clay layer can be found based on the following equation: Sy 0.75 m, H Ao P 600 kN P = 600 kN 15 m Foundation A 1.5 m x 1.5 m Foundation B 1.5 mx 1.5 m 0.8 m 0.8 m Sand 2 m T=18 kN/m3 E 20 MPa, ¥*0,3 3.5m Clay 4.5 m Yeat 19 kN/m3 m, = 0.2 m2/MN, C, = 107 m2/s 3 m Highly permeable bedrock
QA 5m deep deposit of silty sand lies above a 4m deep deposit of The Uneler- gravel. gravel is lain by a deep layer of stiff clay. The ground water table is found 2m. below the ground sur lace. The Soil Properties are:- of Bal Sand below GWT = 1.75 Mg 1 m³ Pat Isat of gravel = 2.05 Mg/m³ sat of sand above G.WT = 1.7 Mg/m³ Draw The distribution of vertical total stress, Pore water pressure, and vertical effective stress with depth down to the clay layer. 0 = 8xh 8 = 1.7 Mg/m³ Sat St But = 1.95 Mg/m³ = 2.05 Mg/m³ D GWT silty sand G.L gravel clay H 5⁰m
Example: 1 • A square footing 2.5m x 2.5m is shown in the figure below. Determine the magnitude of the safe gross load (using MEYERHOF'S method and factor of safety of 3) that the footing can carry. 1m Bearing Capacity 1m y = 15kN/m³ c=0 = 35⁰ Yat=19kN/m²