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What are the permissible tensile and bending stress values for M20 concrete?
Ayantia
20kn/mm2
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∙ 11y ago
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Assumptions of ultimate load method?
1. Plane sections normal to axis remain plane after bending. This implies that strain is proportional to the distance from neutral axis. 2. Maximum strain in concrete of compression zone at failure is 0.0035 in bending 3. Tensile strength of concrete is ignored. 4. The stress-strain curve for the concrete in compression may be assumed to be rectangle, trapezium, parabola or any other shape which results in prediction of strength in substantial agreement with test results.
What is the difference between Bending and Direct Stress?
-> when a structural body gets deviated from its original position or from its centroidal axis due to externally applied load,then it is termed as BENDING->DIRECT STRESS is the stress which act normal to the plane-> stress and bending are the two different things. stress produced by load per area & bending is the effect produced by load and stress.
Why steel is used to reinforce concrete?
Steel and iron, particularly in the form of TMT (Thermo-Mechanically Treated) steel bars, play a pivotal role in reinforcing concrete structures. Here's why steel is the material of choice for this critical task: High Tensile Strength: Steel boasts an exceptional tensile strength, which means it can withstand pulling forces without easily breaking or deforming. Concrete, on the other hand, is excellent in compression but weaker in tension. By embedding steel within concrete, you harness the superior tensile strength of steel to counteract the tensile stresses that concrete alone can't handle. Ductility: Steel is also highly ductile, which can deform without breaking. This ductility allows it to absorb and distribute stress effectively, preventing sudden, catastrophic failures in concrete structures. When concrete begins to crack under stress, the embedded steel maintains structural integrity. Corrosion Resistance: TMT steel bars, specifically designed for construction, are further treated to enhance corrosion resistance. This feature ensures the longevity and durability of the reinforced concrete, especially in harsh environmental conditions. Size and Shape Variability: Steel reinforcement can be customized for various project requirements. Different-diameter steel bars can be used to provide the necessary strength and support for specific structures. Using steel, especially TMT steel bars, in reinforcing concrete is an intelligent engineering choice. It addresses concrete shortcomings regarding tensile strength, provides flexibility for structural integrity, and ensures the longevity of the reinforced concrete. For all your steel needs, including TMT steel bars, consider Vedanta Metalbazaar. Their commitment to quality and reliability makes them a trusted source for steel and iron products in the industry.
What is the difference between tensile strength and tensile modulus?
Tensile strength is the ultimate capacity of the material to resist a tensile load regardless of deflection.Tensile modulus also known as Young's modulus, is a measure of the stiffness of an isotropic elastic material. It is defined as the ratio of the uniaxial stress over the uniaxial strain. It is determined from the slope of a stress-strain curve traced during tensile tests conducted on a sample of the material.
What is the difference between a load-controlled tensile test and a displacement-controlled tensile test?
If the test is set to load-control , it means that the stress will not drop once the fracture become unstable. In displacement control the stress may drop at unstable fracture.
Which of these stress is bigger yield or tensile?
Yield stress is bigger than tensile stress.
What is tensile modulas?
Tensile modulus is the ratio of tensile stress to tensile strain.
Relation between tensile stressbending moment and section of modulus?
The relation between bending moment and the second moment of area of the cross-section and the stress at a distance y from the neutral axis is stress=bending moment * y / moment of inertia of the beam cross-section
What is sagging bending moment?
Sagging bending moment causes the beam to bend in a way to make concavity downward (cup-shaped) and it results in developing tensile stress in lower half of the beam x-section.
Assumptions of ultimate load method?
1. Plane sections normal to axis remain plane after bending. This implies that strain is proportional to the distance from neutral axis. 2. Maximum strain in concrete of compression zone at failure is 0.0035 in bending 3. Tensile strength of concrete is ignored. 4. The stress-strain curve for the concrete in compression may be assumed to be rectangle, trapezium, parabola or any other shape which results in prediction of strength in substantial agreement with test results.
What are the 5 types of mechanical stress?
There actually only 3 principle types of stress: Tensile, Compressive and Shear. The other two are actually combinations of those three. Those stresses are torsional and bending. Torsional stress is generally a tangentially arranged collection of shear stresses. Bending is a combination of both compression and tension on opposite sides of a neutral plane through the bending section.
What are the relation between tensile stress and shear stress and bearing stress?
Tensile Stress is approximately two times the shear stress.Relationship bet n Tensile Stress and bearing stress varies from application to application.It Depends on Various Factors.
What is the applications of prestressed concrete?
Applications of prestressed concrete:Used in large diameter concrete pipesUsed in railway sleepersWater tanksPrecast concrete piles to counter tensile stress during transport and erection. used in bridges construction
What is the opposite stress of compressional stress?
Tensile.
How do you calculate tensile stress?
tensile stress=tensile load/cross sectional areaex. tensile stress= p/a= 50kilo newton x 1000n/kg divide by pi/4(20)^2=159.15N/mm^2
What is full prestressing?
It is the one in which tensile stresses in the concrete are entirely obviated at working loads by having sufficiently high pre-stress in the member.
What is a Stress at a divergent stress boundary?
This is known as tensile stress.
