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What is contect pressure in footing?
vivek gami
< strong>contact pressure is the pressure between footing end and soil strata where we rest the footing. we should have safe contact pressure to avoid foundation failure like (punching failure, shear failure, excessive settlement of the foundation, etc. ) it is express by load per area it isRead more
< strong>contact pressure is the pressure between footing end and soil strata where we rest the footing.
we should have safe contact pressure to avoid foundation failure like (punching failure, shear failure, excessive settlement of the foundation, etc. )
it is express by load per area
it is depending on
see the figure to more understanding
See lessWhat are the factor affecting in selection of foundation ?
Preet Chovatiya
There are certain factors that should be considered during the selecting the foundation. Type of structure Type of loading pattern Location of the building (region of building) Soil condition Water table level Types of material that will used in construction Lifespan of structure
There are certain factors that should be considered during the selecting the foundation.
- Type of structure
- Type of loading pattern
- Location of the building (region of building)
- Soil condition
- Water table level
- Types of material that will used in construction
- Lifespan of structure
See lessHow many legged stirrups do I have to provide in Footing if shear stress exceed 5 kg/cm2?
Rohan Chaugule
2 legged vertical stirrups are to be provided when shear stress increases more than 5kg/cm2. The footing undergoes punching shear due to which its stability.One-way shear has to be checked across the full width of the base slab on a vertical section located from the face of the column, pedestal or wRead more
2 legged vertical stirrups are to be provided when shear stress increases more than 5kg/cm2. The footing undergoes punching shear due to which its stability.One-way shear has to be checked across the full width of the base slab on
a vertical section located from the face of the column, pedestal or wall at a distance equal to
(i) effective depth of the footing slab in case of footing slab on soil.
2) half the effective depth of the footing slab if the footing slab is on
Two-way or punching shear (cls.31.6 and 34.2.4)
Two-way or punching shear shall be checked around the column on a
perimeter half the effective depth of the footing slab away from the face of the column or pedestal
The permissible shear stress, when shear reinforcement is not provided, shall not exceed ks c τ , where ks = (0.5 + β c ), but not greater than one, β c being the ratio of short side to long side of the column, and c τ = 0.25(fck) 1/2 in limit state
method of design, as stipulated in. Normally, the thickness of the base slab is governed by shear. Hence, the necessary thickness of the slab has to be provided to avoid shear reinforcement.
See lessDifference between Gross Bearing Capacity and Safe Bearing Capacity of Soil?
Neenu S K
Hi, In gross bearing capacity, the gross load is taken. Loads from the superstructure, self-weight of the foundation, and overburden pressure are the gross loads. Gross bearing capacity value is not taken in design as it is very high. Safe bearing capacity is the bearing capacity value that neglectsRead more
Hi,
In gross bearing capacity, the gross load is taken. Loads from the superstructure, self-weight of the foundation, and overburden pressure are the gross loads. Gross bearing capacity value is not taken in design as it is very high.
Safe bearing capacity is the bearing capacity value that neglects the overburden pressure and stress due to the footing weight. It is obtained by considering the factor of safety, i.e. net load is taken into consideration. More detailed explanation is given below.
GROSS BEARING CAPACITY OF SOIL (qu)
NET ULTIMATE BEARING CAPACITY OF SOIL (qnu)
SAFE BEARING CAPACITY OF SOIL
- Safe Bearing capacity of soil is obtained after applying the factor of safety.
- It is divided into two:
- Safe Net Bearing Capacity
- Safe Gross Bearing Capacity
- Safe Net Bearing Capacity is defined as the net soil pressure that can be safely applied to the soil considering shear failure alone. It is obtained as qns = Net Ultimate Bearing Capacity (qnu)/Factor of Safety, i.e. qns = qnu/FS
- Safe Gross Bearing Capacity or Safe bearing Capacity is defined as the maximum gross pressure that soil can carry without shear failure. It is given by safe gross bearing capacity qs = qns + γDf
See lessWhat is the difference between Gray Water and Black Water in Sewers?
poojan
Gray water: It is water that comes from the kitchen sinks, bathrooms, bathing water, water from washing clothes, utensils, or any other wastewater which does not contain feces of humans or other animals. Blackwater: It is now apparent that it is water which contains feces of animals and humans, it iRead more
Gray water: It is water that comes from the kitchen sinks, bathrooms, bathing water, water from washing clothes, utensils, or any other wastewater which does not contain feces of humans or other animals.
Blackwater: It is now apparent that it is water which contains feces of animals and humans, it is water from urinals, toilet seats, commodes, etc. is called black water
And to tell the difference in the sewer is hard because it generally mixes in the sewer, if not provided with different outlets.
I hope this helps!
See lessWhat is the Possibility of Footing Failure with Reduced Cement Content?
Madeh Izat Hamakareem
This problem needs an adequate investigation to determine the weakness of the foundation, and then specify remedial options if needed. The strength of the foundation should be evaluated, then structural designer can check the load-carrying capacity of the foundation, and ultimately decided whether rRead more
This problem needs an adequate investigation to determine the weakness of the foundation, and then specify remedial options if needed.
The strength of the foundation should be evaluated, then structural designer can check the load-carrying capacity of the foundation, and ultimately decided whether remedial measures are needed or not.
Adequate quantity of cement content ensures sufficient alkalinity and cement paste volume to fill spaces between compacted aggregate particles. So, durability issues may also arise in the future.
The remedial measures are determined based on the mat foundation weaknesses and conditions. Hamidul Ahasan, Shajal Khan, Ahmedul Hassan, Raquib Ahsan, and Mehedi Ahmed Ansary published an article under the title Use of Jet Grouting in Retrofitting of a RMG Factory Building in Chittagong,
Bangladesh. They discussed a repair method to increase the load-carrying capacity of the mat foundation that supports four-story building.
See lessWhen should we opt for continuous footing?
Gopal Mishra
Continuous footing is used under walls and where the spacing between two individual footing is very small or they overlap.
Continuous footing is used under walls and where the spacing between two individual footing is very small or they overlap.
See lessHow to set out foundation on steep slope?
Gopal Mishra
Architects are not structural designers. They design mostly the looks of the building and inner space of the building. Get your building designed by a qualified structural engineer. He will provide you actual construction drawing which will have all the details of the foundation and other structuralRead more
Architects are not structural designers. They design mostly the looks of the building and inner space of the building. Get your building designed by a qualified structural engineer. He will provide you actual construction drawing which will have all the details of the foundation and other structural members. It will be easy to understand the construction drawing.
See less