A machine and its foundation weigh 140 kN. The spring constant and the damping ratio of the soil supporting the soil may be taken as 12 x 10+ kN/m and 0.2, respectively. Forced vibration of the foundation is caused by a force that can be expressed as Q (kN) = Qosinot Qo=46 kN, @= 157 rad/s Determine (a) the undamped natural frequency of the foundation, (b) amplitude of motion, and (c) maximum dynamic force transmitted to the subgrade.

A machine and its foundation weigh 140 kN. The spring constant and the damping ratio of the soil supporting the soil may be taken as 12 x 10+ kN/m and 0.2, respectively. Forced vibration of the foundation is caused by a force that can be expressed as Q (kN) = Qosinot Qo=46 kN, @= 157 rad/s Determine (a) the undamped natural frequency of the foundation, (b) amplitude of motion, and (c) maximum dynamic force transmitted to the subgrade.

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter18: Sheet-pile Walls

Section: Chapter Questions

Problem 18.17P

See similar textbooks

Similar questions

pls replyy asap!! Given the dimension of a gravity dam with top base = 2m, bottom base =6m, height = 8m and depth of water at the upstream side is 6m (acting on vertical side of the dam). Neglect hydrostatic uplift and use unit weight of concrete equal to 20 kN/m?. The coefficient of friction between the base of the dam and the foundation is 0.6. Determine the Factor of safety against sliding.
An R.C. Column footing 2.26 m in square shape is to rest 1.5 mbelow level ground level is on cohesive soil. The unit weight is17.6kN/m3. What is the safe load if cohesion is 30kN/m3Factor of safety 2.4? Angle of internal friction 33° by IS code.
Calculate the maximum safeload of square footing 3.5 m angle of shear being 36° FOS=3, Unit weight =16 kn/m3
Calculate the width of the concrete wall that is necessary to prevent the wall from sliding and the horizontal reaction acting on the system, Rx. The unit weight of the concrete is 23.6 kN/m^3 and the coefficient of friction between the base of the wall and the foundation soil is 0.42. Use 1.5 as the factor of safety against sliding. Will it also be safe from over turning?
An excavation 5 m depth is supported by a sheet pile. The sheet pile is extended 3.2 m below the ground and the water table is at the bottom of the pile. Unit weight of soil is 1.91 g/cc. Angle friction is 34°. 1. Which of the following most nearly gives the active force? a. 178.3 kN b. 133.73 kN c. 205.05 kN d. 151.56 kN 2. Which of the following most nearly gives the passive force? a. 274.9 kN b. 308.84 kN c. 339.38 kN d. 397.07 kN 3. Which of the following most nearly gives the passive resistance to mobilize stability? a. 388.2 kN b. 456.7 kN c. 548.04 kN d. 502.37 kN
A 1.80m x 1.20m x 0.4m footing with a column at the center is loaded with a column at the center is loaded with a column load of 750 kN and a moment of 290 kN-m acting about the transverse axis of the footing base. The base of the footing is 1.25m below the ground. Use the unit weight of 24 kN/m^3 for concrete and 18 kN/m^3 for the soil above the footing.Determine the equivalent eccentricity of the load,mm?Maximum net soil pressure under the footing, kPa?Required minimum additional axial load so that the whole footing base is under pressure,kN?
A trapezoidal dam has width at the top of 2m and width at the bottom is 14m. The upstream face is vertical and the total height of the dam is 22m. The depth of the water on the upstream face of the dam is 20m. If the coefficient of friction between the dam and the foundation is 0.88, using unit weight of concrete equal to 23.5 kN/cu.m, a) compute the factor of safety against slidingb) compute the factor of safety against overturning
Proivde the summary of the below ? General shear failure
Investigate the dam by computing the factors of safety against 1. Sliding 2.Overturning 3.also compute the soil pressure and compare the maximum pressure against the allowable bearing capacity of soil of 300kpa. Is this a good design? Explain Use u=0.60 and sg of dam=2.40
A 567 mm square pedestal is to be supported by a 3.44m by 5.21m footing. It is to carry an axial dead load of 610 kN and an axial live load of 745 kN and a lateral live load of 136kN acting parallel to long dimension of footing and 1.26 m from the top of the footing. The thickness of the footing is 525mm. Unit weight of concrete = 24 kN/m3; Unit weight of soil = 15.56 kN/m3. . Hint: (Moment from lateral force = Force x distance from the bottom of the footing). Calculate the required soil bearing capacity in kPa.
A wall footing 1 m wide carries a uniform load of 300 kN/m of wall length. Soil weights 16 kN/m^3.Using the influence chart, compute the total vertical increment of the loads at a depth of 3 m from the edge of the strip in kN/m. a. 48 b. 60 c. 156 d. 108
PS. triangular load is from 25 kN/m to 0 kN/m