Is structure engineering troubling you?
Do you face problems in solving even the basic problems?
If yes then look no further as engineeringcivil.com along with Er. Gobind Khurana and Er. Abhimanyu has taken an initiative to help civil engineering students in structure related queries. We are thankful to Er. Gobind Khurana, Er. Abhimanyu and Vincent T. H. CHU for being a volunteer in helping other engineers in solving problems related to structure design in R.C.C and Steel.
Expert 1
Name – Er. Gobind Khurana
Qualification:
1. Bachelor of Civil Engineering From Thapar University Patiala
2. Master of Structure Engineering from Delhi University.
Work Profile: Currently working as Consultant for structural problems in R.C.C and STEEL Design.
Expert 2
Name – Er. Abhimanyu
Qualification:
Bachelor of Civil Engineering From Thapar University Patiala
Training at site in Unitech ( during 6 month summer training)
Work Profile : Presently working as associate design engineer for Fluor Daniel India Pvt Ltd. Area of work is structural steel design and concrete foundations for both static and dynamics analysis ( mainly in oil and gas industry)
Expert 3
Er. Vincent T. H. CHU obtained the degree of civil and structural engineering in the University of Hong Kong. He is the author of the monthly column “The Civil FAQ” in the Hong Kong Engineer published by the Hong Kong Institution of Engineers and is the author of the civil engineering monthly columns “The Civil Q&A” and “The Civil Corner” on the websites on World Federation of Engineering Organization and the University of Science and Technology (American Society of Civil Engineers – International Student Group) respectively. He is the recipient of the Ombudsman’s Award 2007 under complaint-related category and Young Engineer of the Year Award 2008 (Merit) organized by the Hong Kong Institution of Engineers. He is also the author of the engineering book “200 Question and Answers on Practical Civil Engineering Works”, “Civil Engineering Practical Notes A-Z” , “Ask Vincent Chu (Common FAQ on Practical Civil Engineering Works)” and “The Underlying Reasons in Practical Civil Engineering Works”.
So if you have any query regarding the concerned matter, just drop a comment and we will try to solve it as soon as possible.
sir,
plz suggest me the stone for following with reason of choice:
1.random rubble masonary
2.bed plate for girder
3.reinforced cement concrete
4.industrial building
5.cornice of building
6.external walls
i have been given the topic of “airport designing keeping chennai airport as reference” in college for mini project . i would like to which components of the airport are built first the terminals , the runway , taxi ways etc . my guide also said chennai airport does not have enough facilities to make a successful landing of high speed planes like the concorde , why is that so ?
can u please advice me on the above problem .
thanks for responding to my earlier question .
Hi sir
i want to know about the permeability test of concrete cube of size 15*15*15 cm in lab.
pls send me the procedure of it.
thanks
anjit karna
I would like to know how and who can do cement testing on my house
how to fix the expansion joint spacing in concrete? (length of expansion joint)
To Ganesan
In the life cycle of a concrete structure (not prestressed concrete), it will
generally undergo the following process of contraction and expansion:
Contraction: (a) Early thermal movement
(b) Seasonal contraction owing to drop in temperature
(c) Shrinkage
Expansion: (a) Seasonal expansion owing to drop in temperature
The order of magnitude for items (a) to (c) is more or less the same. Hence,
qualitatively speaking, for a given length of concrete structure, the number
of contraction joints should be more than the number of expansion joints
and they are roughly in the order of 3:1 to 2:1 based on the number of
expansion and contraction process above. Of course, the actual spacing
and number of contraction joints and expansion joints should be
determined case by case.
For example, a concrete structure has the coefficient of
thermal expansion of 9×10-6 /oC and a Young’s modulus of 34.5kN/mm2.
With an increase of temperature of 20oC and it is restricted to free
expansion, then the structure is subject to an axial stress of 6.21MPa.
For the expansion joint width of 20mm (movement accommodation factor is 0.2),
L = 20mm x 0.2 / (20 x 9 x10exp-6) = 20m
sir i want to ask abt the speciefic gravity test n bulk density test n the all abt the test which i want to do in leb so can u sugges any book any related things
can we use bitumunus seal caot on m40 concrete road repair solution according to irc?
To madhur,
How can you use bituminous seal coat to repair concrete road? Please clarify your question.
When using the Master/Slave Joints command in STAADPro modelling, how does it affects the stresses induced by the slab to the supporting beams, what if this particular command is not used in the model, what will be its effect on the whole structure?…
What is the ideal schedule (time) to saw cut a Portland Cement Concrete Pavement using a portable diamond tip concrete cutter, beginning from the time the concrete has set…Thank you…
To Andrew,
There is an optimum time to saw contraction joints in new concrete
pavement. Sawing cannot be carried out too early because the saw blade
would break out particles from pavement and this results in the formation of
jagged and rough edges. Such raveling is undesirable as it would impair
the appearance and the ability to seal the joint properly.
Sawing cannot be implemented too late. When the volume of concrete is
reduced significantly owing to drying shrinkage or thermal contraction, it
induces tensile stress owing to the restraint of such reduction. When the
tensile stresses exceed the tensile strength of concrete, cracking would
result and form in other locations instead of the planned location of
contraction joints.
Thank you very much…..
actually, i want to know the procedure for ‘gas jar method’. and also the type of table used to interpret the data.. can u give me the information.. thank you..
I am a civil engineering student. Can you please tell me somthing about “Road alignment” ..??
To Shreeniwas
Please be specific. Otherwise it is difficult to answer your question.
Means what is the Road allignment and what are its uses.
To Shreeniwas,
Road alignment means the direction the road turns and it is important when deisgn traffic flow. If extreme curvature or unsuitable steeps are introduced, this would promote traffic accidents.
thank you sir…
i want complete mix design report for latest version
Will you please suggest some topics about RAft foundation design and explaination
sir,
i would like to know which material test lab in india do the following test :
1. Moment of inertia 2. Section Modulus 3. Sound absorbation test and thermal tests .
please reply soon at my email id .
Thanks in advance .
Ashish Maheshwari
Dear Sir
I want to know about the Machine foundation design.
Machine specification
Machine Wt : 123.5MT
Length :12m
Width : 5m
Speed : 750rpm.
Concrete wt : 2.5 x Machine wt.
Please help me
BR
Rana Masud
sir,
does is it possible that the field density determined by sand replacement method is more than density determined in the lab by proctor test.
To devendra
Soil compaction is the process of increasing the soil density by reducing
the volume of air within the soil mass.
Soil compaction depends mainly on the degree of compaction and the
amount of water present for lubrication. Normally 2.5kg rammers and 4.5kg
rammers are available for compaction in laboratories and the maximum dry
densities produced by these rammers cover the range of dry density
obtained by in-situ compaction plant.
Regarding the second factor of water content, it affects the compaction in
the following ways. In low water content, the soils are difficult to be
compacted. When water content is increased gradually, water will lubricate
the soils and this facilitates the compaction operation. However, at high
water content, as an increasing proportion of soils is occupied by water, the
dry density decreases with an increase in water content.
For soil compaction tests, the dry density obtained from compaction carried
out in-situ by vibrating roller/vibrating plate is compared with the maximum
dry density conducted in laboratories using 2.5kg rammer of compaction
with similar soils. In essence, the in-situ compaction is compared with the
compacting effort of using 2.5kg (or 4.5kg) rammer in laboratories. In case
the compaction test results indicate values exceeding 100%, it only means
that the in-situ compaction is more than that being carried out in
laboratories which is treated as the basic criterion for satisfactory degree of
soil compaction. Therefore, the soil results are acceptable in case
compaction test results are over 100%. However, excessive compaction
poses a risk of fracturing granular soils resulting in the reduction of soil
strength parameters.
hi myself yogesh….can someone send me detailed estimate of 4 m diameter intake well and 10 m height.
what the different between index and direct test
I would be highly thankful if you provide me information regarding the subjects mentioned below:
I would like to know the permissible values as specified in IS Codes for coarse and fine aggregates relating to the characteristics mentioned below ;
a) Silt content
b) Bulkage
c) Moisture content
d) Deleterious material
e) Chloride content
f) Specific gravity
g) Soundness and void content
PHYSICAL AND CHEMICAL PROPERTIES FLYASH IN CONCRETE MIX DESIGN
To N. SHIVA
Workability: A higher reduction of water demand when compared with GGBS.
Reason: Mean particle size and grading, spherical particle shape and increase in powder volume brought about the lower relative density.
Setting Time: Longer than normal OPC concrete
Reason: The delay in setting time is owing to the slower initial rate of reaction between PFA and water.
Heat of Hydration: Lower heat of hydration compared with Portand cement
The effect of 30% replacement of PFA is similar to 70% of GGBS
Reason: It is partially attributed to the utilization of the heat generated by Portland cement hydration reaction in the GGBS hydration reaction.
Cube Strength: Smaller early strength but higher in strength in long time when compared with OPC concrete
Reason: The early rate of strength gain is slower than normal OPC concrete resulting in lower strength. On the contrary, at later stages, the increased rate of strength gain leads to higher long-term strength.
Drying Shrinkage: Lower than OPC concrete
Reason: the decrease in paste volume associated with PFA cement
Bleeeding: Lower than OPC concrete
Reason: The increase volume of fines and reduced water content
Sensitivity to curing: Higher than OPC concrete
Reason: This is due to slow initial hydration rates of PFA concrete and extended curing time is needed.
Chloride Attack: Concrete with PFA is substantially more resistant to chloride ingress than OPC concrete because the movement of ions in aqueous solution in concrete is slower than the movement of water (“sieve” effect of gel)
Sulphate Resistance: Resistance to sulphate attack is higher than OPC.
Alkali-silica reaction: It is generally accepted that the use of sufficiently high levels of PFA (i.e. 25%) can reduce the risk of damage owing to alkali-silica reaction.
Elastic Modulus: The elastic modulus of concrete containing PFA is equal to or slightly higher than OPC of the same grade.