To Design RC column and beam for RC residential structure using TSD

1. Based on the analysis design RC column and beam.

AIM:- To design RC column and beam based on the analysis.

INTRODUCTION:- Design of beam and column includes selection of member size, reinforcement required, grade of concrete etc. so as to transfer the load safely. Design is checked based on analysis preformed on strength and serviciability.

PROCEDURE:-

 Column Design

• Select frame A from project window.
• Select the column to be designed. 
• Right click the member to select Interactive Design.

• The Column property for C11 is shown at different stack level.

• Select Stack 1 of C11 column as shown utility ratio is 0.705.
• Orginally, Torsional bars of 16mm diameter was provided(T16) was provided as both principle and intermediate bar which pass the design criteria.
• Change the principle and intermediate bar size to T20 and link bars to T10 where the maximum utility ratio changes to 0.5946

• Similarly for stack 2 and 3 change both principle and intermediate bar to T20 and link bars to T10 as done for Stack 1.
• Change Section size to 350mm x 350mm for stack 3.
• Therefore, UR changes to 0.54 and 0.65 for stack 3 and 2 respectively. Hence, safe.

 

• Select column 12 for interactive design.
• Select stack 1, Change the bar size to T25 for both principle and intermediate bars and T10 for link bars. Therefore, UR change to 0.679.

• Similarly for stack 2 and 3 change both principle and intermediate bar to T25 and T20 respectively and link bars to T10 as done for Stack 1.
• Change Section size to 350mm x 350mm for stack 3.
• Therefore, UR changes to 0.71 and 0.99 for stack 3 and 2 respectively.
• Since the UR value for stack 2 is quite high. Increase the reinforcement diameter both Stack 1 and 2 to T25.
• Therefore, UR value changes to 0.84 and 0.58 for stack 1 and 2 respectively.

• Select column 13 for interactive design where stack 2 need to be redesigned.

• Select stack 2, Change the bar size to T25 for both principle bars and T10 for link bars.
• Also, provide 2 numbers of intermediate bars of T20. Therefore, UR change to 0.87.

 

• Similarly, for stack 1 and 3 change both principle and intermediate bar to T25 and T20 respectively and link bars to T10 as done for Stack 1.
• Change Section size to 350mm x 350mm for stack 3.
• Therefore, UR changes to 0.85 and 0.6 for stack 3 and 2 respectively.

 

  

• Select column 18 for interactive design where maximum ratio is 0.996 for stack 2.

• Select stack 2 to redesign, Change the bar size to T25 for both principle and intermediate bars and T10 for link bars. Therefore, UR change to 0.713.

• Similarly, for stack 1 and 3 change both principle and intermediate bar to T25 and T20 respectively and link bars to T10 as done for Stack 2.
• Change Section size to 350mm x 350mm for stack 3.
• Therefore, UR changes to 0.77 and 0.6 for stack 3 and 1 respectively.

 

• Select column 15 for interactive design .

 

• Select stack 1 to redesign, Change the bar size to T25 for both principle and intermediate bars and T10 for link bars. Therefore, UR change to 0.41.

 

• Similarly, for stack 2 and 3 change both principle and intermediate bar to T25 and T20 respectively and link bars to T10 as done for Stack 1.
• Change Section size to 350mm x 350mm for stack 3.
• Therefore, UR changes to 0.42 and 0.32 for stack 2 and 3 respectively.

 

• Check for the statue of column in review view.

 

• Similarly, interactive design is done for columns in frame C and B.

 Beam Design

• For frame C, Check the maximum bending moment acting in the beam where average BM at span is 66.6kNm and 118kNm at support.

 

• Select the intermediate beam/ First floor beam.
• Design the intermediate floor beam with interactive design.
• This shows beam doesnot follow the design criteria.

• Select the first beam.
• Provide longitudinal bars T20 and T25 at both top and bottom and also, T10 stirups 

 

• Select end beam of the continuous beam, ie , beam 4.
• Provide 3 nos of T25 and 2 nos T20 bars at the top and 2 nos of T20 at bottom
• Also, provide stirrups of T10 

• Similarly, provide T25 reinforcement at top and bottom of the beam.
• But, reinforcement ratio is greater than 1.

• Therefore, increase the depth of the beam from 225mm x 500mm to 225mm x 600mm in property window.
• Interactive design for the first beam is done.
• Select first section of the beam. Provide T20 at span T25 and T20 at supports for top reinforcements and T20 at bottom.

• Select second section of the beam. Provide T20 at span T25  at supports for top reinforcements and T25 at bottom.

 

• Select third section of the beam. Provide T20 at span T25  at supports for top reinforcements and T25 at bottom.

• Select 4th section of the beam. Provide T20 and T25  at supports for top reinforcements and T20 at bottom.

• After resizing the member to 225 x 600 mm, 1st order analysis is done
• Once again interactive design is done to check reinforcement provided is ok.

 

• Select the roof beam for interactive design.

 

• Select all 4 sections of the beam.
• Provide T16 and T20 bars as top reinforcement and T16 as bottom reinforcement.

 

 

• Select the ground beam for interactive design.

• Select all 4 sections of the beam.
• Provide T16,T20 and T25 bars as top reinforcement and T16 as bottom reinforcement.

 

 

• Select frame A, select the first floor beam for interactive design.

• As seen member section does not fall under the limit.
• So, the member need to resized.
• Go to manage property sets to create member size of 225mm x600 mm as created for first floor beam in frame C.

• Select the first floor beam, right the member to apply property sets of 225 x 600mm

• 1st order linear analysis is done again.
• Select the beam for interactive design

• Select all 4 sections of the beam.
• Provide T20 and T25 bars as top reinforcement and as bottom reinforcement.

 

 4

• Select frame 1 with cantilever portion.
• Apply property sets 225mm x 600mm as provided for first beams in frame A and C.
• Run 1st order linear analysis.
• Check for interactive design 

• Select all 4 sections of the beam. First the cantilever portion of the beam
• Provide T20 and T25 bars as top reinforcement and T16 as bottom reinforcement.
• Provide T10 stirups throughtout.

• Next, the Continuous beam are provided with T16 and T25 bars at top and T20 at bottom.

 

• Finally, the end cantilever beam

• Similarly, continue interactive design this with rest of the beams.

RESULT:- Hence, design RC column and beam are shown based on the analysis.