Reinforcement Detailing of Beams from ETABS output

Answer of the Question

AIM: Aim to the question is Detailed design of concrete buildings -1

OBJECTIVE:

• To understand or know the Design of Beam using ETABS analysis.
• To understand the basics of beam reinforcement detailing with respect to primary standards.
• To ensure the ductility reinforcement required by IS- 133920-2016 has been satisfied in ETABS design.

INTRODUCTION: there are certain rules we follows before,

• 1 Maximum reinforcement for shrinkage & temperature
• Reinforcement required for limiting crack-width
• Ultimate limit state design rebar requirement
• Ductility rebar requirement

What is sheare stress = `(Load)/( Area)`

Whichever is greater Should be drawn in RC beam detailing

• Minimum longitudinal reinforcement as per IS- 133920-2016 clause 6.2.1 As =360 `mm^2`
• Minimum shear (or) transverse reinforcement as per IS-456-2000 clause 26.5.1(1000mm spacing in the formula) Asv= 332`mm^2`
• Development length as per IS-456-2000 clause 26.2.1 Ld = 41x diameter of bar

PROCEDURE: TO COMPLETE THE ANSWER OF THE QUESTION WE HAVE TO FOLLOW THE FOLLOWING STEPS. (ETABS DESIGNING)

STEP-1

• Open the attached file
• Open the First floor
• and First we have to analyize the modal.

STEP-2

• After analyzing of the modal click to the 3d view
• We get the following modal.
• We get the maximum and minimum deflection in the status bar.

STEP-3

• Now Go to the concrete frame button.
• and analyze the concrete Design.

STEP-4

in the plan view various data is mention.

• Left support top requirement.
• Left support bottom requirement.
• mixed-pan top requirement.
• mixed-pan bottom requirement.
• Right support top requirement.
• Right support bottom requirement.

STEP-5

• Go to the concrete design and Drop-down the box click to the display design information
• change the option to shear reinforcement and click apply.

STEP-6

• Now we are check the details of particular section.
• To know the units of figure.

STEP-7

• Now click to the details.
• we get the shear reinforcement details.

STEP-8

• Now in the plan one beam showing O/S
• it means the beam is a failure in the beam is Over-stressed.

• in the beam report we can find the "The shear stress due to shere force torsion together exceeds maximum allowed."

STEP-9

• Longitudinal Reinforcement of Beam at Grid-3 from ETABS (mm2):

.

• Shear reinforcement of Beam At Grid-3 from ETABS(cm2/1000mm):

• Longitudinal Reinforcement of Beam at Grid-3 from ETABS (mm2):

• Shear reinforcement of Beam At Grid-3 from ETABS(cm2/1000mm):

STEP-10

STEP-11

1.4 times of Support A sagging moment + Support B hugging moment

For Sway shear force to Right,

• Mas= 174kNm
• Mbh= 293kNm
• Lab= 4.725m
• Vd+1 = 92 kN

Vu,a = 46kN , Vu,b= 230 kN

For Sway shear force to Left.

• Mah =234 kNm
• Mbs=155kNm
• Lab = 4.725m
• Vd+1= kN

Vu,a = 185 kN, Vu,b = 45kN

STEP-12

Detailing of beams using AutoCAD

Grid A

Grid 3

RESULTS: The following has been illustrated properly along with results:-

1. Analysis and design the RC moment frame for G+4 building
2. Providing details of longitudinal and shear reinforcement for beam along with elevation details
3. Providing reasons for failure of the middle span along grid A
4. Calculating value of maximum shear forces in any of the span