What is the difference between "working stress method"
And "limit state method"?
Answers were Sorted based on User's Feedback
Answer / sjtbehera
limt state method concept- in limt state concept, the
structure are designe to with stand safety of all loads
liable to act on it through out its life.so the acceptable
limit for safteym and serviceability recquirements before
fauilure occutrs is called limit state.
in working stress method the structure are desigined by
considering stress acting on the structure. the stress are
tensile stress,wind, earthquick etc.
Is This Answer Correct ? | 117 Yes | 52 No |
Answer / anjali
• In working stress,Stresses in an element is
obtained from the working loads and compared with
permissible stresses.The method follows linear stress-
strain behavior of both the materials.Material capabilities
are under estimated to large extent.moreover Ultimate load
carrying capacity cannot be predicted accurately.
• Whereas in limit state method, stresses are
obtained from design loads and compared with design
strength.In this method, it follows linear strain
relationship but not linear stress relationship (one of the
major difference between the two methods of design).The
ultimate stresses of materials itself are used as allowable
stresses.The material capabilities are not under estimated
as much as they are in working stress method. Partial
safety factors are used in limit state method.
Is This Answer Correct ? | 69 Yes | 4 No |
Answer / kosh nath adhikari
In working stress metothod stress and strain curve is linear
Is This Answer Correct ? | 75 Yes | 31 No |
Answer / umesh bodade
wsm is uneconomical as true behavior of material is not
taken into consideration.it consider upto only elastic
limit,so 100% strength of material is not achieved.
in lsm behaviour of material upto failure is taken into
account hence whole strength is utilised.
Is This Answer Correct ? | 45 Yes | 9 No |
Answer / venkadeshwaran
In WSM the factor of safety of concrete is assumed to be 3 and factor of safety of steel is 1.8,so that it requires more percentage of steel and also in WSM the concrete and steel have a linear variation in elastic property.It is one of the main reason for failure of this method.
In LSM the factor of safety of concrete is assumed to be 1.5 and factor of safety of steel is 1.15.so that the percentage of steel rods used is very less when compared to the WSM.
Is This Answer Correct ? | 43 Yes | 17 No |
Answer / xeem
in limit stress desing strss are calculated bye consdering
factor loads,
working desing metho actual load are consider. and most inn
practices in fields.
Is This Answer Correct ? | 33 Yes | 9 No |
Answer / chandra shekhar meena
limt state method concept- in limt state concept, the
structure are designe to with stand safety of all loads
liable to act on it through out its life.so the acceptable
limit for safteym and serviceability recquirements before
fauilure occutrs is called limit state.
in working stress method the structure are desigined by
considering stress acting on the structure. the stress are
tensile stress,wind, earthquick etc.
Is This Answer Correct ? | 33 Yes | 10 No |
Answer / sarika
working stress method did not consider the factor of safety
and involved very high use of steel,thus making the
structure otherwise safe.
however, limit state design considers the factor of safety
and provides 4 limit states for safe design
Is This Answer Correct ? | 53 Yes | 31 No |
Answer / adam iqbal
In working stress approach, service loads are used in the whole design and the strength of material is not utilized in the full extent. In this method of design, stresses acting on structural members are calculated based on elastic method and they are designed not to exceed certain allowable values. In fact, the whole structure during the lifespan may only experience loading stresses far below the ultimate state and that is the reason why this method is called working stress approach. Under such scenario, the most economical design can hardly be obtained by using working stress approach which is now commonly used in the design of temporary works.
In limit state approach, for each material and load, a partial safety factor is assigned individually depending on the material properties and load properties. Therefore, each element of load and material properties is accurately assessed resulting in a more refined and accurate analysis of the structure. In this connection, the material strength can be utilized to its maximum value during its lifespan and loads can be assessed with reasonable probability of occurrence. Limit state approach is commonly used for the majority of reinforced concrete design because it ensures the utilization of material strength with the lowest construction cost input.
Is This Answer Correct ? | 9 Yes | 2 No |
Answer / khan
Structures Which can release Load's are designed by WSM,Eg DAMS, CANALS: But Structures In which V cannot release load But only can transfer it,r designed by LSM.
Is This Answer Correct ? | 5 Yes | 1 No |
How much kilogram of binding wire required for fabricate one Metric ton of reinforcing steel
how many nos of hacking over concrete surface required for 1 sq m area
12 Answers Creative Turnkey Projects, L&T,
where will be the reinforcement of slab placed when there is an inverted beam and the bottom of the beam and slab are at same level ?
If 16 mm dia hysd bar of grade Fe500 is needed in a beam but it is not available in the construction site but the beam has to cast in an emergency. Which dia of bar is to be used for for that situation? (If greater than 16 dia bar is not available at site)
what"s the difference between fe 415 grade steel and fe 500 grade steel? and which one is mostly used for residential and apartment constructions?
pile load testing procedure
what is the difference between arch dam and gravity dam. Name a gravity dam in India
6 Answers AAI Airports Authority Of India, L&T,
Curing time for 1)R.C.C slab 2)B.W 3)Plastering
minimum spacing of bars in column????as per code...???
7 Answers PNC, Rajesh Associates,
1) what is the seewage discharge per person per day taken for design purpose as per IS codes? 2) how to convert gauge to MM like if we measure 18G as our door frame then how much is it in MM ? 3) how much binding wire is required ti tie 100kg steel ? 4) while making rings in steel reinforcement , whether the corners of rings are deducted to take out cutting length ? 5) how much carbon content should be there in steel used for construction purpose? 6) what are fe415 & fe 500 and which bars are used in general civil works?
What is difference between engineering stress and true stress?
How many steel is require in one sqft area?
17 Answers L&T, XYZ,