Design of Foundation System for Multistory Building

                        Prepared by :
Hamza khwayre
Ruaa Khaled Mustafa
Under supervision of:
  Dr. Isam Jardaneh





Outline 
Review of types of the Foundation 
The Purpose of the Project 
Site Investigation 
Gravity Load Analysis
Seismic Load Analysis
Result of analysis







Type of Foundation
  
 1)  shallow foundation

 Single footings 

strip footings

raft foundations (mat foundation)

  2) deep foundation

piles



    




The purpose of the project 
The aim of this project is figure out the most appropriate foundation type for Residential Multistory Building suggested to be designed in this project
First case: under gravity load.
Second case: under seismic load and gravity load.





Site Investigation Report 

It Is a report which provide the geotechnical situation and parameters for a certain site. 
Three borehole were dug out in the soil ,(13 m depth , and the others was 9 m depth) .





Geological Section
   allowable  Bearing capacity = 220 kn/m^2 at depth 3 m 
 allowable  Bearing capacity = 350kn/m^2 at depth 7 m
    allowable  Bearing capacity = 114 kn/m^2 at depth 1 m






Gravity Load Analysis
Structural analysis including ETAB analysis for static and earthquake loads is presented
Area of the building =450 m^2
Number of story = 7
Height of story =4m
Depth of foundation we are going to build =4m
Type of soil is marl soil with bearing capacity q all =220 kn/m^2.
Live load on the slab =2kn/m^2
Super imposed dead load on the slab = 3.5 kn/m^2
The slap is two way ribbed with block 








 
IBC 2015 – CODE 

Z factor equal to   0.2g 

Site classification according to shear velocity The site class is site class (D) 

Seismic design category (D)

Type of Analysis is Equivalent static Method (ELF)

Sway Special Moment Resisting Frame



Seismic Load Analysis




 Result of Analysis






Dimension of the Footings
(Gravity Load)
bearing capacity
 






Foundation Plan 





Dimension of the Footing
(Seismic and Gravity Load) 






Mat Foundation





Checks for Design















 

ρ =   

Strain 0.005           =0.9

 ϕVc p 

Vu p=p ult – (Ḁ * q ult)





Cost of the Project





Thank you 




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