Reinforcement Detailing of Beams from ETABS output

Detail design of beams in Etabs 2018.
The ETABS file for a G+4 building is provided. Run the analysis and design the RCC Moment ResistingFrame. The following challenge deals specifically with two continuous beams in the 1st floor.

        1) 3 span continuous beam along grid A
        2) 7 span continuous beam along grid 3

Address the following issues thereafter.
        • Provide details of longitudinal and shear reinforcement for the two continuous beams. Sketch the beam elevation details or draft it using autocad software. A sample of how beam elevation details is prepared in consultancy firms is provided below. Participants can prepare it as per their preference:

• Provide reasons for failure of the middle span along grid A. What are the possible ways this issue can be resolved?

• Calculate value of the maximum shear force in any one of the spans in both the continuous beams, as per clause 6.3.3 (b) in IS 13920 – 2016. Also, confirm these values from shear force demand calculated by ETABS.Please note that if longitudinal reinforcement provided is more than required (as per ETABS results), the shear force demand will vary from what is provided by ETABS.

ANS

AIM:- To design beams in detail from Etabs 2018.

         To provided details of logitudinal and shear reinforcement for the given two continuous beams.

To calculate the value of maximum shear force in any one the span in the continuous beams.

INTRODUCTIONS:

• Beams is horizontal structural elements used for the supporting lateral loads.
• The Design and detailing of RC beams involves the selection of the proper beam size and serviceability limit state requirements.

PROCEDURE:-

STEP - 1:

• First we have to open the challange 7 page and download the challage.
• After downloading the challenge open it in ETABS 2018 as shown below.

STEP - 2:

• Next we have to check the load combinations as shown below.

STEP - 3:

• Next we have to start the beam design by selecting the start design/check option as shown below.

STEP - 4:

• After the completion of the beam design we need to select the display info option as shown below.

• After selecting the display info option the new tab appeard in that we select the longitudinal reinforcing in the design output and click on the ok button as show below

• Next the longitudianl reinforncement details appear as shown below.

STEP - 5:

• Next we need to draw the reinforement diagram of 3 span contious beams along Grid -A and also need to provide reinforcement details.
• The maximum ast for the bottom support is 1766mm2 and bottom middle 702mm2
• The maximum ast for the top support is 1889mm2 and top middle 453mm2 
• Now we provided 3-28dia at the top and bottom as shown in the below figure.
• Next we provide 1-8dia the top support for the continois beam,as  shown below

STEP - 6:

• Next we need to the draw the reinforcement diagram of 7 span contious beam along Grid - 3 ans also need to provied the reinforcement details
• The maximum ast to the bottom support is 106mm2 and bottom middle is 1493mm2 
• The maximum ast for the top suport is 1915mm2 and top middle 479mm2
• Now we provided 3-22dia at top and bottom as shown in the below figure 
• Next we provided 1-10dia and 1-12dia the top support and we provided 2-16dia at the bottom middle for the continous beam as shown below.

STEP - 7:

• After providing the beam reinforcement  details we select the beam and right click on the beam then the  new tab appears as shown below.
• Next we need to click on the details option in concrete beam design tab as shown below.

• Next the shear details be visible as shown below.
• As per the clause 6.3.3 the design force is 232 KN.
• We got maximum shear force = 174.11KN.

RESULT:

• The beam are design successfully in details from the ETABS software.
• Provided the details of longitudinal asn dhesr reinforcement for the two continuous beams
• And also calculated the value pof maximum shear force in the continuous beams using the Etabs software.