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Which method assumes that the structural material behaves in a linearly elastic manner?
- a)None of the given options
- b)Ultimate load method
- c)Limit state method
- d)Working stress method
Correct answer is option 'D'. Can you explain this answer?
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Which method assumes that the structural material behaves in a linearl...
The design methods of reinforced cement concrete structures are as follows:
- Working stress method
- This method is based upon linear elastic theory or depends on the classical elastic theory.
- This method ensured adequate safety by suitably restricting the stress in the materials induced by the expected working leads on the structures.
- The basic assumption of linear elastic behavior is considered justifiable since the specified permissible stresses are kept well below the ultimate strength of the material.
- The ratio of the yield stress of the steel reinforcement or the concrete cube strength to the corresponding permissible or working stress value is usually called a factor of safety.
- Ultimate load method:
- This method is based on the ultimate strength of reinforced concrete at ultimate load is obtained by enhancing the service load by some factor called load factor for giving a desired margin of safety. Hence the method is also referred to as the load factor method or the ultimate strength method.
- In the ULM, the stress condition at the state of in pending collapse of the structure is analyzed, thus using, the non-linear stress-strain curves of concrete and steel.
- The safety measure in the design is obtained by the use of the proper load factor.
- Limit state method:
- Limit states are the acceptable limits for the safety and serviceability requirements of the structure before failure occurs.
- The design of structures by this method will thus ensure that they will not reach limit states and will not become unfit for the use for which they are intended.
- It is worth mentioning that structures will not just fail or collapse by violating (exceeding) the limit states. Failure, therefore, implies that clearly defined limit states of structural usefulness have been exceeded.
- Limit states are two types
- Limit state of collapse
- Limit state of serviceability
Kani’s method:
It is the method of structural analysis and its displacement method.
It is the method of structural analysis and its displacement method.
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Which method assumes that the structural material behaves in a linearl...
Working Stress Method:
The working stress method assumes that the structural material behaves in a linearly elastic manner. Here's a detailed explanation:
Assumption of Linear Elastic Behavior:
- The working stress method is based on the assumption that the material used in the structure will behave in a linearly elastic manner. This means that the material will deform elastically under load and return to its original shape once the load is removed.
- Linear Elastic Behavior implies that the stress-strain relationship of the material is linear within the elastic range. This assumption allows for simple calculations and easy interpretation of results.
Calculation of Stresses:
- In the working stress method, the stresses induced in the structural members are calculated using the formula: Stress = Force / Area. The allowable stress is then compared to the ultimate strength of the material to ensure that the structure is safe.
- The design stresses are typically limited to a fraction of the material's ultimate strength to provide a margin of safety. This fraction is known as the factor of safety.
Design Considerations:
- The working stress method is commonly used in the design of structures where the loads are relatively low and the material properties are well understood. It is suitable for simple structures where the behavior of the material can be accurately predicted.
- However, it is important to note that the working stress method does not account for factors such as material nonlinearity, creep, and fatigue. Therefore, it may not be suitable for all types of structures or loading conditions.
In conclusion, the working stress method assumes linear elastic behavior of the structural material and is widely used in civil engineering for designing structures subjected to low and predictable loads.
The working stress method assumes that the structural material behaves in a linearly elastic manner. Here's a detailed explanation:
Assumption of Linear Elastic Behavior:
- The working stress method is based on the assumption that the material used in the structure will behave in a linearly elastic manner. This means that the material will deform elastically under load and return to its original shape once the load is removed.
- Linear Elastic Behavior implies that the stress-strain relationship of the material is linear within the elastic range. This assumption allows for simple calculations and easy interpretation of results.
Calculation of Stresses:
- In the working stress method, the stresses induced in the structural members are calculated using the formula: Stress = Force / Area. The allowable stress is then compared to the ultimate strength of the material to ensure that the structure is safe.
- The design stresses are typically limited to a fraction of the material's ultimate strength to provide a margin of safety. This fraction is known as the factor of safety.
Design Considerations:
- The working stress method is commonly used in the design of structures where the loads are relatively low and the material properties are well understood. It is suitable for simple structures where the behavior of the material can be accurately predicted.
- However, it is important to note that the working stress method does not account for factors such as material nonlinearity, creep, and fatigue. Therefore, it may not be suitable for all types of structures or loading conditions.
In conclusion, the working stress method assumes linear elastic behavior of the structural material and is widely used in civil engineering for designing structures subjected to low and predictable loads.
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Which method assumes that the structural material behaves in a linearly elastic manner?a)None of the given optionsb)Ultimate load methodc)Limit state methodd)Working stress methodCorrect answer is option 'D'. Can you explain this answer?
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