Project 1 - Review of Shear & Moment Connections in RAM Connection

Q, Design and optimize typical shear, moment and Splice joints in RAM Connection for the following structure modelled in Staad Pro. Design and optimize base plate connection.

Structure: A 2D portal frame fixed support spanning 15m with a pitched roof ridge height of 12m, slope of 4 degrees. A uniformly distributed load of 10kN/m is applied on the roof beams. Optimize the beams and columns for 85% utilization and consider splice joints at 6m from base and 4m from beam column joints. Consider a hanger beam shear connected with column support of 4m height from the splice joint with a length of 3m from beam-column corner joint carrying 5kN/m load. Use hot rolled sections. 

AIM:

• To determine the Shear, moment and Splice joints in RAM Connection for a 2D portal frame is required to be designed.

GIVEN DATA:

• Supports o 2D Frame                       :    Fixed support
• Spann                                               :    15m
• Roof                                                :    Pitched roof
• Ridge height                                    :   12m
• Slope                                                :   4 degrees 
• Load                                                 :   UDL of 10 kN/m on roof beam
• Stees Section                                    :   Hot rolled
• Splice joint location                         :   At 6 m from base 
• Hanger beam                                    :    Shear connected with column support of 4 m height from splice joint with a length of 3m with a beam column corner joint carrying 5 kN/m load.
• Also Design and optimize base plate connection. Optimise beam and column for 85% utilization

PROCEDURE:

Open the staad.pro and make a portal frame

• 2D portal frame as per given data  and loading is shown below-

• Self-weight in the form of Dead load is assigned as shown below-

• Live load of 10 Kn/m as UDL on roof beam is assigned as shown below-

• Live load of 5 Kn/m as UDL on hanger beam is assigned as shown below-

3D view of 2D portal frame-

• Shear, moment and splice joints are created as shown below-
• Bolted splice flange plate joint is between member 1 & 8  at node 7
• Beam column flange bolted moment joint is between member 5 & 9  at node 3
• Beam column flange seating angle shear connection at node 8 between member 9 &10

• Above steps up to step-3 are common to all the joints so shall not be repeated

Design - 1st Joint

• Bolted splice flange plate joint is between member 1 & 8  at node 7

• Design of Bolted splice flange plate joint is designed as shown below in which utilisation ratio is 0.95 < 1>

• Report- Data

• Report- Results

 

• DXF details-

Design - 2nd Joint

• Beam column flange bolted moment joint is between member 5 & 9  at node 3

• Design of Beam column flange bolted moment joint is between member 5 & 9  at node 3 is as shown below in which utilisation ratio is 0.9 <1>

• Report- Data

• Report- Results

• DXF details-

Design -3rd Joint

• Beam column flange seating angle shear connection at node 8 between member 9 &10

• Design of Beam column flange seating angle shear connection at node 8 between member 9 &10

• Report- Data

• Report- Results-

• DXF Details-

RESULT:

• The 2D Portal frame is created in staad.pro  with given data and typical shear, moment and slice joint in RAM connection for 2D portal frame are designed and optimized as shown below.
• Design of all the 03 joints are safe from Geometrical consideration as well as on strength criteria as indicated from utilization ratio which are 0.95 , 0.9 and 0.82  very close to 1.0 but < 1>