Bissoy.com
Doctors Medicines MCQs Q&A

What is the minimum thickness of two way simply supported slab with span 2.5 × 3.5 m and subjective to live load of 3kN/m2 is reinforced with Fe 250.

What is the minimum thickness of two way simply supported slab with span 2.5 × 3.5 m and subjective to live load of 3kN/m2 is reinforced with Fe 250. Correct Answer 72 mm

Concept:

As per IS 456: 2000, Cl 24.1:

For two-way slabs of shorter spans(up to 3.5 m) with mild steel reinforcement, the span(shorter) to overall depth ratios given below may generally be assumed to satisfy vertical deflection limits for loading class up to 3 kN/m2.

Type of Slab

Shorter span/overall depth ratio (l/D)

Simply Supported Slab

35

Continuous Slab

40

 

For HYSD bars such as Fe 415 and above grade, the above values to be multiplied by ‘0.8’.

Calculation:

Slab is simply supported and Shorter Span = 2.5 ; Load = 3 kN/m2 with mild steel of Fe 250

Based on above given information:

Shorter span to overall depth ratio i.e. l/D = 35

D = 2500/35

∴  D = 72 mm

Related Questions

For a slab size 3.5 × 4.5 m subjected to live load 4.5 kN/m2 and effective thickness as 150 mm, determine the short span moment when edges of slab are simply supported and corners are not held down and moment coefficients for short span and long span are 0.0912 and 0.0558. Use M30 concrete and Fe15 steel.
In counterfort type retaining walls
i) the vertical slab is designed as a continuous slab
ii) the heel slab is designed as a continuous slab
iii) the vertical slab is designed as a cantilever
iv) the heel slab is designed as a cantilever
The correct answer is
Seven people A, B, C, D, E, F and G live on separate floors of a 7-floor building. Ground floor is numbered 1, first floor is numbered. 2 and so on until the topmost floor is numbered 7. Each one of these having a different cars-Cadillac, Ambassador, Fiat, Maruti, Mercedes, Bedford and Fargo but not necessarily in the same order. Only three people live above the floor on which A lives. Only one person lives between A and the one having a car Cadillac. F lives immediately below the one having a car Bedford. The one having a car Bedford lives on an even-numbered floor. Only three people live between the ones having a car Cadillac and Maruti. E lives immediately above C. E is not having a car Maruti. Only two people live between B and the one having a car Fargo. The one having a car Fargo lives below the floor on which B lives. The one having a car Fiat does not live immediately above D or immediately below B. D does not live immediately above or immediately below A. G does not have a car Ambassador. Question : How many people live between the floors on which D and the one having a car Bedford ?
Statement I): Torsion reinforcement is provided at (and near) corners in a two-way slab which is simply supported on both edges meeting at the corner. Statement II): The area of reinforcement in each of the layers shall be three-quarters of the area required for maximum mid-span moment in the slab.
Read the following information carefully and answer the questions that follow: Seven persons Tina, Vini, Yasir, Rishi, Sanya, Pankaj and Urmila live on the separate floors of a 7- floor building. Ground floor is number one; second floor is number two and so on. Each of them goes to a city viz. Paris, Istanbul, Shanghai, Durban, London, Madrid and Dubai but not necessarily in the same order. Only three people live above the floor on which Sanya lives. Only one person lives between Sanya and the one who goes to Paris. Vini lives just below the person who goes to Madrid. Only three people live between the one who goes to Paris and London. The person who goes to Madrid lives on an even numbered floor. Urmila lives just above Rishi. Urmila does not go to London. Only two persons live between Pankaj and the one who goes to Durban. Pankaj lives above the person who goes to Durban. Yasir does not go to Istanbul. Tina does not live just above or just below Sanya. The one who goes to Shanghai does not live just above or just below Pankaj. Who among the following lives on floornumber 7?
Calculate ultimate moment and shear of effective span is 30m, live load is 9kn/m, dead load excluding self weight is 2kn/m, load factors for dead load is 1.4 for live load is 1.6 cube strength of concrete fcu is 50n/mm2 cube strength at transfer is fci is 35n/mm2, tensile strength of concrete Ec is 34kn/mm2 loss ratio ɳ is 0.85 and 8mm diameter high tensile strength fpu is 1500n/mm2 are available for use and the modulus of elasticity of high tensile wires is 200kn/mm2?
A plane slab of thickness 60 cm is made of a material of thermal conductivity k = 17.45 W/m K. Let us assume that one side of the slab absorbs a net amount of radiant energy at the rate q = 530.5 watt/m2. If the other face of the slab is at a constant temperature t2 = 38 degree Celsius. Comment on the temperature with respect to the slab?
If K is a constant depending upon the ratio of the width of the slab to its effective span l, x is the distance of the concentrated load from the nearer support, bw is the width of the area of contact of the concentrated load measured parallel to the supported edge, the effective width of the slab be is
If K is a constant depending upon the ratio of the width of the slab to its effective span $$l$$, x is the distance of the concentrated load from the nearer support, bw is the width of the area of contact of the concentrated load measured parallel to the supported edge, the effective width of the slab be is
A simply supported beam A carries a point load at its mid span. Another identical beam B carries the same load but uniformly distributed over the entire span. The ratio of the maximum deflections of the beams A and B, will be