Reinforcement Detailing of Beams from ETABS output

Aim:-

• Detailed design of beams from Etabs 2018.
• Provide details of longitudinal and shear reinforcements for the given two continuous beams.
• Calculate the maximum shear force value for one span of a continuous beam.

Introduction: -

• Beams are horizontal structural members used to support lateral loads.
• In conventional reinforced concrete structures, beams typically receive loads from floor slabs, but may also receive other loads such as wall loads, surfaces, and domestic equipment.
• RC beam design and detailing involves selecting the correct beam size and the amount of longitudinal and shear reinforcement to meet the requirements for final and serviceable conditions.
• After this, it is very important to place and position the beam reinforcements correctly on site to avoid construction errors.

Procedure: -

• Download the given attachment and open it.
• Check the load combinations.
• Run the analysis from the analyze tab or press f5.
• Now, start designing the beam by selecting the Start/Check Design option as shown below.
• Once the check is finished with designing the beam, you need to select the “Show Design Info” option as shown below.
• If you select the 'Show design information' option, a new tab will appear where you can select the longitudinal rebar in the design output and click the 'OK' button, as shown below.
• Longitudinal reinforcement details are displayed as shown in the following image.
• Next, we need to create a 3-span continuous beam reinforcement diagram along Grid-A and also specify the reinforcement details.
• Maximum branch of lower support is 1766mm² and lower center is 702mm²
• Maximum branch of upper support is 1889mm² and upper center is 4534 mm²
• Currently, we have 3-28Φ for top and bottom as shown below.
• Next, provide 1-8 Φ for the top support of the continuous beam as shown below.
• Next, we need to draw a reinforcement diagram for the 7-span continuous beam along Grid-3 and also specify the reinforcement details.
• Maximum branch of lower support is 1061mm² and lower center is 1493 mm²
• Maximum branch of upper support is 1915mm² and upper center is 4794 mm²
• Currently, we have 3-22 Φ for top and bottom as shown below.
• Then provide 1-10 Φ and 1-12 Φ for the top support and 2-16 Φ bottom center for the continuous beam as shown below.
• After specifying the beam reinforcement details, select the beam, and right click on the beam, a new tab will appear as shown below.
• Now you need to click on the Details option on the Concrete Beam Design tab as shown below.
• Then the shear details are displayed below.
• According to section 6.3.3 the design force is 232 kn.
• Maximum Shear = 174.11kn

Result:

• The beam was designed in detail by Etabs software.
• Specification for longitudinal and shear reinforcement of two continuous beams.
• In addition, the Etabs software was used to calculate the maximum shear force values ​​for continuous beams.