Problem Statement A site selected for construction of multistorey building has a layered stratum as shown in figure below. Based on field investigation and laboratory testing, soil A was found to be c soil, while soil B a claycy soil (-0). The students are required to assume any realistic values against c/y of soil for making calculations. q = 50 kN/m² Soil A 6 m 3 m H2 Soil B 1) If proposed building load applied at the surface is 50 kN/m² (as shown in the Fig.), calculate vertical effective stress at the center of clay layer both before and after construction of building. 2) If double basement is planned for the structure with proposed foundation level at 6m from natural ground surface, will it be possible to make a vertical cut without providing any lateral support and keeping a factor of safety 2? 3) If we have to design a smooth rigid retaining wall to support this vertical cut with horizontal top surface, calculate the magnitude, location and direction of resultant active thrust acting on wall. 4) A machine is to be placed at floor of proposed building. Idealizing the situation as spring-mass system, building foundation is subjected to a dynamic force of Q = 34.7 sinat with frequency, f= 15.5 Hz and spring-constant = 72,000 kN/m. If weight of machine plus foundation is 150 kN. Determine the maximum and minimum dynamic force transmitted to underneath soil.
Problem Statement A site selected for construction of multistorey building has a layered stratum as shown in figure below. Based on field investigation and laboratory testing, soil A was found to be c soil, while soil B a claycy soil (-0). The students are required to assume any realistic values against c/y of soil for making calculations. q = 50 kN/m² Soil A 6 m 3 m H2 Soil B 1) If proposed building load applied at the surface is 50 kN/m² (as shown in the Fig.), calculate vertical effective stress at the center of clay layer both before and after construction of building. 2) If double basement is planned for the structure with proposed foundation level at 6m from natural ground surface, will it be possible to make a vertical cut without providing any lateral support and keeping a factor of safety 2? 3) If we have to design a smooth rigid retaining wall to support this vertical cut with horizontal top surface, calculate the magnitude, location and direction of resultant active thrust acting on wall. 4) A machine is to be placed at floor of proposed building. Idealizing the situation as spring-mass system, building foundation is subjected to a dynamic force of Q = 34.7 sinat with frequency, f= 15.5 Hz and spring-constant = 72,000 kN/m. If weight of machine plus foundation is 150 kN. Determine the maximum and minimum dynamic force transmitted to underneath soil.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Problem Statement
A site selected for construction of multistorey building has a layered stratum as shown in figure below. Based
on field investigation and laboratory testing, soil A was found to be c soil, while soil B a clayey soil (-0).
The students are required to assume any realistic values against cy of soil for making calculations.
q = 50 kN/m
Soil A
6 m
3 m
Soil B
1) If proposed building load applied at the surface is 50 kN/m? (as shown in the Fig.), calculate vertical
effective stress at the center of clay layer both before and after construction of building.
2) If double basement is planned for the structure with proposed foundation level at 6m from natural
ground surface, will it be possible to make a vertical cut without providing any lateral support and
keeping a factor of safety 2?
3) If we have to design a smooth rigid retaining wall to support this vertical cut with horizontal top surface,
calculate the magnitude, location and direction of resultant active thrust acting on wall.
4) A machine is to be placed at floor of proposed building. Idealizing the situation as spring-mass system,
building foundation is subjected to a dynamic force of Q = 34.7 sincat with frequency, f = 15.5 Hz and
spring-constant = 72,000 kN/m. If weight of machine plus foundation is 150 kN. Determine the
maximum and minimum dynamic force transmitted to undermeath soil.
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