# Welcome to Osdag help!¶

Osdag is a cross-platform free and open-source software for the design and detailing of steel structures, following relevant Indian Standards. Osdag is primarily built upon Python and other Python-based FOSS tools, such as, PyQt, OpenCascade, PythonOCC, SQLite, etc. It is developed by the Osdag team at IIT Bombay.

This beta version of Osdag contains four shear connection modules.

The example OSI files can be loaded using the `File -> Load input`

option of the appropriate connection module.

## 1. Connections¶

### 1.1. Shear Connection¶

#### 1.1.1. Fin Plate Connection¶

1.1.1.1 Column Flange-Beam Web (CFBW) connectivity

Sample problem 1Design a fin plate connection between a beam MB 500 and a column UC 305 x 305 x 97 for transferring a vertical (factored) shear force of 140 kN. Use M24 Friction grip bolts of grade 8.8. Try 12mm thick fin plate with weld thickness of 12mm. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). Assume bolt hole type as standard, weld type as shop weld and type of edge as hand flame cut.

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Sample problem 2Design a fin plate connection between a beam MB 350 and a column SC 200 for transferring a vertical (factored) shear force of 150 kN. Use M20 bearing bolts of grade 4.6. Try 12mm thick fin plate with weld thickness of 8mm. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). Assume weld type as shop weld and type of edge as machine flame cut.

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1.1.1.2. Column Web-Beam Web (CWBW) connectivity

Sample problem 1Design a fin plate connection between a beam UB 356 x 171 x 45 and a column PBP 300 x 180 for transferring a vertical (factored) shear force of 120 kN. Use M16 Friction grip bolts of grade 8.8. Try 8mm thick fin plate with weld thickness of 8mm. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). Assume bolt hole type as standard, slip factor of 0.25, type of weld as field weld and edge as hand flame cut.

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Sample problem 2Design a fin plate connection between a beam LB 300 and a column SC 250 for transferring a vertical (factored) shear force of 135 kN. Use M24 bearing bolts of grade 4.8. Try 10mm thick fin plate with weld thickness of 8mm. Take Fe410 grade steel f_{y}= 250 MPa, f_{u}= 410 MPa). Assume bolt hole type as standard, type of weld as shop weld and edge as hand flame cut and environment as corrosive.

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1.1.1.3. Beam-Beam (BB) connectivity

Sample problem 1Design a fin plate connection between a primary beam MB 350 and a secondary beam NPB 270 x 135 x 36.1 for transferring a vertical (factored) shear force of 110 kN. Use M20 Friction grip bolts of grade 10.9. Try 10mm thick fin plate with weld thickness of 8mm. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). Assume slip factor of 0.52, bolt hole type oversized and type of edge as machine flame cut.

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Sample problem 2Design a fin plate connection between a primary beam WPB 450 x 300 x 99.7 and a secondary beam UB 356 x 171 x 67 for transferring a vertical (factored) shear force of 220 kN. Use M24 Friction grip bolts of grade 10.9. Try 14mm thick fin plate with weld thickness of 12mm. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). Assume slip factor of 0.48, bolt hole type standard, weld type as shop weld and type of edge as machine flame cut.

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#### 1.1.2. End Plate Connection¶

1.1.2.1. Column Flange-Beam Web (CFBW) connectivity

Sample problem 1Design an end plate connection between a beam MB 350 and a column SC 250 for transferring a vertical (factored) shear force of 140 kN. Use M20 bearing bolts of grade 4.6. Try 10mm thick end plate with weld thickness of 6mm. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). Assume bolt hole type as standard, weld type shop weld and type of edge as hand flame cut.

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Sample problem 2Design an end plate connection between a beam MB 300 and a column UC 254 x254 x 107 for transferring a vertical (factored) shear force of 195 kN. Use M16 Friction grip bolts of grade 8.8. Try 12mm thick end plate with weld thickness of 10mm. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). Assume bolt hole type as standard, weld type shop weld and type of edge as machine flame cut.

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1.1.2.2. Column Web-Beam Web (CWBW) connectivity

Sample problem 1Design an end plate connection between a beam UB 356 x 171 x 45 and a column PBP 300 x 180 for transferring a vertical (factored) shear force of 120 kN. Use M16 Friction grip bolts of grade 10.9. Try 12mm thick end plate with weld thickness of 6mm. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). Assume bolt hole type as standard, slip factor of 0.25, type of weld as field weld and edge type as hand flame cut.

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Sample problem 2Design an end plate connection between a beam LB 300 and a column SC 250 for transferring a vertical (factored) shear force of 135 kN. Use M12 bearing bolts of grade 4.8. Try 10mm thick end plate with weld thickness of 10mm. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). Assume bolt hole type as standard, type of weld as shop weld and edge type as hand flame cut.

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1.1.2.3. Beam-Beam (BB) connectivity

Sample problem 1Design an end plate connection between a primary beam MB 500 and a secondary beam MB 400 for transferring a vertical (factored) shear force of 160 kN. Use M20 Friction grip bolts of grade 8.8. Try 16mm thick end plate with weld thickness of 8mm. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). Assume slip factor of 0.2, bolt hole type as oversized, weld type shop weld and type of edge as machine flame cut.

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Sample problem 2Design an end plate connection between a primary beam WPB 450 x 300 x 99.7 and a secondary beam UB 356 x 171 x 67 for transferring a vertical (factored) shear force of 220 kN. Use M24 Friction grip bolts of grade 10.9. Try 14mm thick end plate with weld thickness of 12mm. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). Assume slip factor of 0.48, bolt hole type as standard, weld type shop weld and type of edge as machine flame cut.

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#### 1.1.3. Cleat Angle Connection¶

1.1.3.1. Column Flange-Beam Web (CFBW) connectivity

Sample problem 1Design a cleat angle connection between a beam MB 400 and a column SC 250 for transferring a vertical (factored) shear force of 140 kN. Use M20 Friction grip bolts of grade 8.8. Try cleat angle of size 90 x 90 x 12. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). Assume slip factor of 0.48, bolt hole type as standard and type of edge as hand flame cut.

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Sample problem 2Design a cleat angle connection between a beam MB 350 and a column HB 300 for transferring a vertical (factored) shear force of 170 kN. Use M16 bearing bolts of grade 4.6. Try cleat angle of size 100 x 100 x 12. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). Assume bolt hole type as standard, type of edge as machine flame cut and environment as corrosive.

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- 1.1.3.2. Column Web-Beam Web (CWBW) connectivity
*Sample problem 1*Design a cleat angle connection between a beam MB 350 and a column UC 305 x 305 x 97 for transferring a vertical (factored) shear force of 120.5 kN. Use M20 Friction grip bolts of grade 8.8. Try cleat angle of size 110 x 110 x 16. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). Assume bolt hole type as standard, slip factor of 0.2, type of edge as hand flame cut and gap between column and beam as 5mm.**Download:***Sample problem 2*Design a cleat angle connection between a beam MB 200 and a column UC 305 x 305 x 118 for transferring a vertical (factored) shear force of 80 kN. Use M12 bearing bolts of grade 6.8. Try cleat angle of size 110 x 110 x 16. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). Assume bolt hole type as standard, type of edge as hand flame cut and environment as corrosive.**Download:**

1.1.3.3. Beam-Beam (BB) connectivity

Sample problem 1Design a cleat angle connection between a primary beam WB 450 and a secondary beam MB 400 for transferring a vertical (factored) shear force of 145 kN. Use M24 bearing bolts of grade 4.6. Try cleat angle of size 100 100 x 10. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). Assume bolt hole type as standard and type of edge as hand flame cut.

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Sample problem 2Design a cleat angle connection between a primary beam WPB 280x280x61.2 and a secondary beam NPB 220x110x29.4 for transferring a vertical (factored) shear force of 100 kN. Use M20 Friction grip bolts of grade 10.9. Try cleat angle of size 100 100 x 8. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). Assume bolt hole type as oversized, slip factor of 0.52, type of edge as machine flame cut and gap between column and beam as 15mm.

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#### 1.1.4. Seated Angle Connection¶

1.1.4.1. Column Flange-Beam Flange (CFBF) connectivity

Sample problem 1Design a seated angle connection between a beam MB 300 and a column UC 203 x 203 x 86 for transferring a vertical (factored) shear force of 100 kN. Use M20 Friction grip bolts of grade 10.9. Try a top angle of size 150 150 x 10 and seated angle of size 150 150 x 15. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). Assume slip factor of 0.55, bolt fu = 940 MPa and type of edge as hand flame cut.

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Sample problem 2Design a seated angle connection between a beam MB 200 and a column SC 140 for transferring a vertical (factored) shear force of 140 kN. Use M12 bearing bolts of grade 6.8. Try a top angle of size 90 90 x 8 and seated angle of size 110 110 x 16. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). Assume type of edge as hand flame cut and environment as corrosive.

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1.1.4.2. Column Web-Beam Flange (CWBF) connectivity

Sample problem 1Design a seated angle connection between a beam NPB 250x150x39.8 and a column PBP 300x180 for transferring a vertical (factored) shear force of 80 kN. Use M16 bearing bolts of grade 5.8. Try a top angle of size 90 90 x 10 and seated angle of size 150 150 x 15. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). Assume type of edge as machine flame cut.

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Sample problem 2Design a seated angle connection between a beam WPB 140x140x24.7 and a column HB 200 for transferring a vertical (factored) shear force of 140 kN. Use M12 bearing bolts of grade 5.8. Try a top angle of size 90 90 x 10 and seated angle of size 150 150 x 15. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). Assume bolt hole type as Oversized, type of edge as machine flame cut and gap between column and beam as 5mm.

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### 1.2. Moment Connection¶

#### 1.2.1. Beam-Beam¶

#### 1.2.1.1. Cover Plate Connection¶

1.2.1.1.1 Bolted connectivity

Sample problem 1Design a bolted cover plate splice connection for beam MB 450 to transfer a factored external moment of 140 kNm, factored shear of 110 kN and factored axial force of 40 kN. Use M20 Friction grip bolts of grade 8.8. Try 20mm thick flange splice plate and 10mm thick web splice plate. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). Assume bolt hole type as standard, edge as hand flame cut, gap between the beams as 5mm and surface of the metal to be treated with sand blast.

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Sample problem 2Design a bolted cover plate splice connection for beam NPB 350 x 250 x 79.2 to transfer a factored external moment and shear force of 225 kNm ad 55 kN. Use M24 Friction grip bolts of grade 10.9. Try 14mm thick flange splice plate and 6mm thick web splice plate. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). Assume bolt hole type as oversized, edge as machine-flame cut, slip factor as 0.33 and gap between the beams as 3mm.

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#### 1.2.1.2. End Plate Connection¶

1.2.1.2.1 Extended Both Ways

Sample problem 1Design a bolted extended (both way) end plate spliced connection for a beam NPB 350x170x50.2, for transferring a factored reversible moment and shear force of 100 kNm and 40 kN. Use M20 bearing bolts of grade 9.8. Try an end plate 20 mm thick and weld of sizes 8 mm and 6 mm at flange and web, respectively. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). The bearing bolt is non-pretensioned and the bolt hole type is oversized. The type of weld is shop weld and the edge type is sheared or hand flame cut.

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Sample problem 2Design a bolted extended (both way) end plate spliced connection for a beam MB 450, for transferring a factored reversible moment, shear force and axial force of 170 kNm, 100 kN and 40 kN, respectively. Use M20 friction grip bolts of grade 8.8. Try an end plate 12 mm thick. The size of weld at flange and web is 6 mm and 8 mm. Take Fe410 grade steel (f_{y}= 250 MPa, f_{u}= 410 MPa). Assume the bolts to be pre-tensioned, bolt hole type is standard and the slip factor is 0.3. The type of weld is shop weld and the edge type is sheared or hand flame cut.

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