Q. reinforced concrete beam 230 mm wide by 500 mm overall depth is reinforced with 4 bars of 12 mm diameter at an effective cover of 50 mm. Using M 20 grade concrete and Fe 415 steel, estimate the moment of resistance of the section. If the beam is simply supported over an effective span of 5m, find the maximum uniformly distributed load the beam can carry, inclusive of its own weight.

by

Q. reinforced concrete beam 230 mm wide by 500 mm overall depth is reinforced with 4 bars of 12 mm diameter at an effective cover of 50 mm. Using M 20 grade concrete and Fe 415 steel, estimate the moment of resistance of the section. If the beam is simply supported over an effective span … Read more

Q.A reinforced concrete beam 300 mm wide by 550 mm overall depth is reinforced with 4 bars of 20mm diameter at an effective depth of 500 mm. Using M 20 grade concrete and Fe 415 steel, estimate the moment of resistance of the section.

by

Q. A reinforced concrete beam 250 mm wide by 475 mm overall depth is reinforced with 3 bars of 16mm diameter at an effective cover of 50 mm. Using M 20 grade concrete and Fe 415 steel, find the depth of neutral axis. SOLUTION: WIDTH b= 250mm EFFECTIVE DEPTH d = 475 – 50 = … Read more

ANALYSIS OF SINGLY REINFORCED SECTIONS – Effective depth, neutral axis, Lever arm, moment of resistance and Types of sections

by

ANALYSIS OF SINGLY REINFORCED SECTIONS  If the reinforced bars are provided only on tension side in the beam section, it is called as singly reinforced beams. Consider a simply supported beam subjected to bending under working loads. Since plane sections are assumed to remain plane after bending, strain is proportional to distance from the neutral … Read more

LOADS – TYPES OF LOADS REINFORCED CONCRETE STRUCTURES

by

LOADS The reinforced concrete structures are designed to resist the following types of loads. (i) Dead loads (ii) Live loads or Imposed loads (iii) Wind loads (iv) Earthquake forces (v) Snow loads (vi) Shrinkage, creep and Temperature ellects. (vii) Other forces and effects DEAD LOADS Dead loads mainly due to self weight of structural members, … Read more

WORKING STRESS METHOD – PRINCIPLES, ASSUMPTIONS, PERMISSIBLE STRESSES AND MODULAR RATIO

by

WORKING STRESS METHOD The stress strain curve of concrete is assumed as lingar from zero at the neutral axis to a maximum value at the extreme fiber Numbers determined by dividing ultimate stress by a factor of safety are used for concrete with a factor of safety of 3, and for steel with a different … Read more

STEEL REINFORCEMENT – Functions,Types of Reinforcement, Modulus of Elasticity and Unit Weight of STEEL

by

STEEL REINFORCEMENT (a) Its tensile strength is high (b) It can develop good bond with concrete. (c) In coefficient of expansion is nearly same as for concrete. (d) It is easily available. SIGNIFICANCE FUNCTIONS OF REINFORCEMENT IN R.C.C The reinforcement in RCC serves the following different types of functions. (1) To resist the bending tension … Read more

PROPERTIES OF CONCRETE 

by

PROPERTIES OF CONCRETE  COMPRESSIVE STRENGTH GRADE OF CONCRETE The compressive strength of concrete is the characteristic compressive strength (/cel of 150 mm concrete cubes at the age of 28 days in N/mm². IS 456-2000 specifies the characteristic compressive strength of 150 mm cube at the age of 28 days in N/mm², as the Grades of … Read more

IMPORTANT FORMULAE OF PROPERTIES OF FLUIDS

by

IMPORTANT FORMULAE OF PROPERTIES OF FLUIDS 1. SPECIFIC WEIGHT ω= ρ/g 2. SPECIFIC VOLUME v= 1/ω 3. SPECIFIC GRAVITY = specific weight of that liquid/specific weight of water 4. COMPRESSIBILITY  = 1/K 5. BULK MODULUS  K = { (dp/dv)/v} 6. VISCOUS SHEAR STRESS  τ = τ = μ*(du/dy) 7. KINEMATIC VISCOSITY  v= μ / ρ, 8. … Read more

The capillary rise in the glass tube is not to exceed 0.2 mm of water. Determine its minimum size, given that surface tension for water in contact with air = 0.0725 N/m.

by

Q. The capillary rise in the glass tube is not to exceed 0.2 mm of water. Determine its minimum size, given that surface tension for water in contact with air = 0.0725 N/m. SOLUTION: Capillary rise, h = 0.2mm = 0.2 * 10³ m Surface tension σ = 0.0725N / m Let dia. of tube … Read more

Calculate the capillary rise in a glass tube 2.5 mm diameter when immersed vertically in (a) water and (b) mercury. Take surface tensions o = 0.0725 N/m for water and sigma = 0.52N / m for mercury in contact with air. The specific gravity for mercury is given as 13.6 and angle of contact = 130°.

by

 Q. Calculate the capillary rise þin a glass tube 2.5 mm diameter when immersed vertically in (a) water and (b) mercury. Take surface tensions o = 0.0725 N/m for water and sigma = 0.52N / m for mercury in contact with air. The specific gravity for mercury is given as 13.6 and angle of contact … Read more