Home | ENGINEERING | Procedure for using of Non dimensional Interaction Diagrams as Design Aids to find steel

Civil - Design of Reinforced Concrete Elements - Limit State Design Of Columns

Procedure for using of Non dimensional Interaction Diagrams as Design Aids to find steel

   Posted On :  17.07.2016 10:23 am

Size of column, Grade of concrete, Grade of steel (otherwise assume suitably) Factored load and Factored moment

Procedure for using of Non-dimensional Interaction Diagrams as Design Aids to find steel

 

Given:

 

Size of column, Grade of concrete, Grade of steel (otherwise assume suitably) Factored load and Factored moment

 

Assume arrangement of reinforcement:  On two sides or on four sides

 

Assume moment due to minimum eccentricity to be less than the actual moment Assume suitable axis of bending based on the given moment (xx or yy) Assuming suitable diameter of longitudinal bars and suitable nominal cover

 

1.    Find d1/D from effective cover d1

2.    Find non dimensional parameters Pu/fckbD and Mu/fckbD2

3.    Referring to appropriate chart from S-16, find p/fck and hence the percentage of reinforcement, p

 

4.    Find steel from, As = p bD/100

 

5.    Provide proper number and arrangement for steel

6.    Design suitable transverse steel

7.    Provide neat sketch

 

Members Subjected to Combined Axial Load and Biaxial Bending

 

The resistance of a member subjected to axial force and biaxial bending shall be obtained on the basis of assumptions given in IS:456 with neutral axis so chosen as to satisfy the equilibrium of load and moments about two axes. Alternatively such members may be designed by the following equation:

 

[Mux/Mux1]?n + [Muy/Muy1]?n ? 1,  where

Mux and My = moments about x and y axes due to design loads,

 

Mux1 and My1 = maximum uni-axial moment capacity for an axial load of Pu bending about x and y axes respectively, and ?n is related to Pu /Puz, where Puz = 0.45 fck .Ac + 0.75 fy Asc

 

For values of Pu /Puz = 0.2 to 0.8, the values of ?n vary linearly from 1 .0 to 2.0. For values less than 0.2 and greater than 0.8, it is taken as 1 and 2 respectively

 

NOTE -The design of member subject to combined axial load and uniaxial bending will involve lengthy calculation by trial and error. In order to overcome these difficulties interaction diagrams may be used. These have been prepared and published by BIS in SP:16 titled Design aids for reinforced concrete to IS 456-2000.

 

IS:456-2000 Code Procedure

 

1.    Given Pu, Mux, Muy, grade of concrete and steel

 

2.    Verify that the eccentricities ex = Mux/Pu and ey = Muy/Pu are not less than the corresponding minimum eccentricities as per IS:456-2000

 

Assume a trial section for the column (square, rectangle or circular).

 

4.    Determine Mux1 and Muy1, corresponding to the given Pu (using appropriate curve from SP-16 design aids)

 

5.    Ensure that Mux1 and Muy1 are significantly greater than Mux and Muy respectively; otherwise, suitably redesign the section.

6.    Determine Puz    and hence ?n

 

7.    Check the adequacy of the section using interaction equation. If necessary, redesign the section and check again.

 

Slender Compression Members: The design of slender compression members shall be based on the forces and the moments determined from an analysis of the structure, including the effect of deflections on moments and forces. When the effects of deflections are not taken into account in the analysis, additional moment given in 39.7.1 shall be taken into account in the appropriate direction.

 

Tags : Civil - Design of Reinforced Concrete Elements - Limit State Design Of Columns
Last 30 days 136 views
Related words :

What is Procedure for using of Non dimensional Interaction Diagrams as Design Aids to find steel Define Procedure for using of Non dimensional Interaction Diagrams as Design Aids to find steel Definition of Procedure for using of Non dimensional Interaction Diagrams as Design Aids to find steel where how meaning of Procedure for using of Non dimensional Interaction Diagrams as Design Aids to find steel lecturing notes for Procedure for using of Non dimensional Interaction Diagrams as Design Aids to find steel lecture notes question and answer for Procedure for using of Non dimensional Interaction Diagrams as Design Aids to find steel answer Procedure for using of Non dimensional Interaction Diagrams as Design Aids to find steel study material Procedure for using of Non dimensional Interaction Diagrams as Design Aids to find steel assignment Procedure for using of Non dimensional Interaction Diagrams as Design Aids to find steel reference description of Procedure for using of Non dimensional Interaction Diagrams as Design Aids to find steel explanation of Procedure for using of Non dimensional Interaction Diagrams as Design Aids to find steel brief detail of Procedure for using of Non dimensional Interaction Diagrams as Design Aids to find steel easy explanation solution Procedure for using of Non dimensional Interaction Diagrams as Design Aids to find steel wiki Procedure for using of Non dimensional Interaction Diagrams as Design Aids to find steel wikipedia how why is who were when is when did where did Procedure for using of Non dimensional Interaction Diagrams as Design Aids to find steel list of Procedure for using of Non dimensional Interaction Diagrams as Design Aids to find steel school assignment college assignment Procedure for using of Non dimensional Interaction Diagrams as Design Aids to find steel college notes school notes kids with diagram or figure or image difference between Procedure for using of Non dimensional Interaction Diagrams as Design Aids to find steel www.readorrefer.in - Read Or Refer

​TOP MENU

OTHER SUGEST TOPIC

Recent New Topics :