Table of Contents
Which of these methods is used for designing of two way slabs?
Coefficient Method: In the American Concrete Institute in 1963 to design two-way slabs carried by steel beams, deep beam, or walls this method was provided. This method employs tables of moment coefficients for different slab edge conditions and these conditions are based on the elastic analysis.
Which method used for design of flat slab?
There are two methods of analysis of RC flat slab viz. Direct Design Method and Equivalent Frame Method.
What are the two methods specified by the code for the design of two way slabs?
Minimum thickness for two way slab construction designed as per methods provided by ACI 318-11 Code namely, direct design method and equivalent frame method. The minimum thickness of slab is specified by ACI 318-11, section 9.5.
Which slab is better one-way or two way?
The one-way slab is economical up to a span of 3.6 meters. Whereas the two-way slab is economical for the panel sizes up to 6m × 6m. In one-way slab quantity of steel is less. In two-way slab quantity of steel is more as compared to the one-way slab.
What is a two way slab?
Two way slab is a slab supported by beams on all the four sides and the loads are carried by the supports along with both directions, it is known as two way slab. In two way slab, the ratio of longer span (l) to shorter span (b) is less than 2. In two way slabs, the load will be carried in both the directions.
What are the two methods of analysis prescribed in the codes for flat slabs?
The analysis of flat slab is executed by Direct Design Method (DDM) & Equivalent Frame Method (EFM) as directed by different standard, however the Finite element analysis & Equivalent frame analysis is carried out by using software SAFE (Slab Analysis by Finite element method and Equivalent frame method).
How do I make a two way concrete slab?
Procedures of Two Way Slab Design by Direct Design Method
- Determine slab type and layout.
- Choose slab thickness that should be adequate for avoiding excessive deflections and satisfy shear at the interior and exterior columns.
- Choose design method (direct design method in this case)
Why a two way slab is preferred over one way slab?
The one-way slab is supported by a beam on two opposite sides only. The two-way slab is supported by the beam on all four sides. While designing a two-way slab we provide more steel hence the depth of the slab decreases, as a result, the thickness of the two-way slab is less as compared to the one-way slab.
Which is best slab?
Both OPC and PPC cements are good for construction of concrete slab. OPC is the most commonly used cement in industrial and large construction, PPC is most commonly used for small residential constructions. PPC is used where possibilities of sulphate attack is higher as it has good sulphate resistance compared to OPC.
What is a 2 way slab?
What are the types of two way slab?
There are mainly three types of designs for two-way slab.
- Two-way solid slab (with beams) Two-way Solid Slabs on Beams.
- Two-way Waffle Slab (with Beams) Two-way Waffle Slab (with Beams)
- Two-way Waffle Slab (with Integral Beams) Cast in Situ Two-way Waffle Slab with Integral Beams.