Criteria assumed to be met (Seismic: AISC 341)
Seismic design in the current release of Tekla Structural Designer covers only those checks detailed in later sections and presupposes certain criteria are met e.g. that lateral braces to beams are sufficiently strong. These presuppositions are noted below.
Common
AISC 341-16 and AISC 341-10
- Column bases are assumed to comply with the requirements of D2.6.
- Steel material grades used in particular members and SFRS type are assumed to comply with A3.1.
AISC 341-05
- Column bases are assumed to comply with the requirements of 8.5.
- Steel material grades used in particular members and SFRS type are assumed to comply with 6.1.
OMF
AISC 341-16 and AISC 341-10
- Beam to column connections used in the SFRS are assumed to satisfy the requirements of E1.6.
AISC 341-05
- Beam to column connections used in the SFRS are assumed to satisfy the requirements of 11.2.
- Continuity plates are assumed to comply with the requirements of 11.5.
- As per 11.9 column splices are assumed to comply with the requirements of 8.4a.
IMF
AISC 341-16 and AISC 341-10
- The lateral braces themselves will not be designed to meet the additional criteria of D1.2a & c - it is assumed that the user will check this independently.
- The position of lateral braces will not be checked for the location of points of concentrated force or positions of plastic hinge per D1.2c.
- The protected zone is assumed to comply with E2.5c.
- Connections used in the SFRS are assumed to satisfy the requirements of E2.6.
AISC 341-05
- Beam to column connections used in the SFRS are assumed to satisfy the requirements of 10.2.
- Panel zones in beam to column connections used in the SFRS are assumed to satisfy the requirements of 10.3.
- Continuity plates are assumed to comply with the requirements of 10.5.
- The lateral braces themselves will not be designed to meet the additional criteria of 10.8 - it is assumed that the user will check this independently.
- The position of lateral braces will not be checked for the location of points of concentrated force or positions of plastic hinge per 10.8.
- As per 10.9 column splices are assumed to comply with the requirements of 8.4a.
SMF
AISC 341-16 and AISC 341-10
- The lateral braces themselves will not be designed to meet the additional criteria of D1.2b & c - it is assumed that the user will check this independently.
- The position of lateral braces will not be checked for the location of points of concentrated force or positions of plastic hinge per D1.2c.
- Beam column connections are always assumed braced as per E3.4c(1).
- The protected zone is assumed to comply with E3.5c.
- Connections used in the SFRS are assumed to satisfy the requirements of E3.6.
AISC 341-05
- Beam to column connections used in the SFRS are assumed to satisfy the requirements of 9.2.
- Panel zones in beam to column connections used in the SFRS are assumed to satisfy the requirements of 9.3.
- Continuity plates are assumed to comply with the requirements of 9.5.
- Beam column connections are always assumed braced as per 9.7a.
- The lateral braces themselves will not be designed to meet the additional criteria of 9.8 - it is assumed that the user will check this independently.
- The position of lateral braces will not be checked for the location of points of concentrated force or positions of plastic hinge per 9.8.
- Column splices are assumed to comply with the requirements of 9.9 whilst those not part of the SFRS are assumed to comply with 8.4b
OCBF
AISC 341-16 and AISC 341-10
- Column splices are assumed to comply with D2.5.
- It is assumed that the beams in OCBF are continuous between columns in accordance with F1.4a.
- It is assumed that the user will ensure that the ends of V and A braces are vertically released so that they provide no support for dead and live loads as per F1.4a (1).
- It is assumed that the user will apply the relevant lateral restraint at position of V/A braces or establish that the beam has sufficient out of plane strength and stiffness to ensure stability in order to comply with F1.4a (2).
- K braces are not permitted for OCBF in accordance with F1.4b.
- Coincident V and A braces giving X type braced frames are out of scope for additional beam checks required by AISC 341-10 F1.4a.
- Bracing connections in the SFRS are assumed to satisfy the requirements of F1.6.
- OCBF above seismic isolation systems are currently beyond scope
AISC 341-05
- Column splices are assumed to comply with 8.4a. Column splices in columns not part of the SFRS are assumed to comply with 8.4b.
- It is assumed that the beams in OCBF are continuous between columns in accordance with 14.3.
- It is assumed that the user will ensure that the ends of V and A braces are vertically released so that they provide no support for dead and live loads as per 14.3 (1).
- Lateral braces are not designed to meet the additional criteria in 14.3 (2) - it is assumed that the user will check this independently.
- It is assumed that the user will apply the relevant lateral restraint at position of V/A braces or establish that the beam has sufficient out of plane strength and stiffness to ensure stability in order to comply with 14.3 (2).
- K braces are currently beyond scope for OCBF.
- Coincident V and A braces giving X type braced frames are out of scope for additional beam checks required by AISC 341-05 14.3.
- Bracing connections in the SFRS are assumed to satisfy the requirements of 14.4.
- OCBF above seismic isolation systems are currently beyond scope
SCBF
AISC 341-16 and AISC 341-10
- Column splices are assumed to comply with D2.5.
- Coincident V and A braces giving X type braced frames are out of scope for additional beam checks required by AISC 341-10 F2.3a.
- It is assumed that the force resisted by tension braces is between 30% and 70% of the total horizontal force along the line of braces as per F2.4a.
- It is assumed that the beams in SCBF are continuous between columns in accordance with F2.4b (1).
- It is assumed that the user will apply the relevant lateral restraint at position of V/A braces or establish that the beam has sufficient out of plane strength and stiffness to ensure stability in order to comply with F2.4b (2).
- K braces are not permitted for SCBF in accordance with F2.4c.
- Tension only braces are not permitted for SCBF in accordance with F2.4d.
- Bracing connections in the SFRS are assumed to satisfy the requirements of F2.5b.
- The protected zone is assumed to comply with F2.5c
AISC 341-05
- It is assumed that the force resisted by tension braces is between 30% and 70% of the total horizontal force along the line of braces as per 13.2c.
- Bracing connections in the SFRS are assumed to satisfy the requirements of 13.3.
- It is assumed that the user will ensure that the ends of V and A braces are vertically released so that they provide no support for dead and live loads as per 13.4a (1).
- It is assumed that the beams in SCBF are continuous between columns in accordance with 13.4a (2).
- Lateral braces are not designed to meet the additional criteria in 13.4a (2) - it is assumed that the user will check this independently.
- It is assumed that the user will apply the relevant lateral restraint at position of V/A braces or establish that the beam has sufficient out of plane strength and stiffness to ensure stability in order to comply with 13.4a.
- K braces are not permitted for SCBF in accordance with 13.4b.
- Coincident V and A braces giving X type braced frames are out of scope for additional beam checks required by AISC 341-05 13.4.
- Column splices are assumed to comply with 13.5. Column splices in columns not part of the SFRS are assumed to comply with 8.4b.
- The protected zone is assumed to comply with 13.6.