STAAD.Pro Help

RR 22.01.00-3.3 IS 13920 2016 Seismic Joint Checks

STAAD.Pro can now check the relative strength of beams and columns at a joint per Clause 7.2 of IS 13920-2016.

Clause 7.2 of IS:13920-2016 checks the relative strength of beams and columns at a joint to evaluate if any column at a joint is acting as a gravity column or is a part of lateral load resisting system. After the concrete design is completed per IS 13920-2016, then this relative strength check is automatically performed at joints in which all connecting beams and columns were designed. Thus, no new commands are required for this check to be performed so long as all concrete members at a joint are designed. Per Cl 7.2, the sum of all column moment resistances at a joint shall be greater that 1.4× the sum of all beam moment resistances at the same point.

Note: STAAD.Pro does not have designate columns as gravity load structural elements. Rather, the program considers all columns as lateral load resisting. If this check fails at any joint, the column dimensions, beam dimension, or both should be changed to make the column suitable for the lateral load resisting system.

It is recommend that the design of all concrete beams and columns be performed in one concrete block (a "concrete block" is the information contained in the START CONCRETE DESIGN … END CONCRETE DESIGN input section) so this check can be performed. If multiple concrete blocks are defined, all previous relative strength check result will be deleted since multiple design of beams and column designs may change the relative strength of beams and columns at a joint. The strength check performed after the last concrete block will be considered valid and is available as result.

The output file will issue a note regarding the results of this check. A detailed output of the checks can be included in the output using the TRACK 4 parameter in the concrete design. The detailed output of the joint relative strength checks are also included in the filename_13920.txt file (which is generated regardless of the TRACK parameter used or check status).
Note: The program assumes that all beams connected to a column are horiztonal and parallel to global X and Z axes. If beams do not meet this requirement a warning message is issued in the analysis output.