To Generate seismic loading based on IS code and to run the analysis using TSD

1. Generate seismic loading based IS codal provisions and zone II. Any other data you can assume and input accordingly

AIM:- To generate seismic loading based IS codal provisions and zone II. Any other data you can assume and input accordingly

INTRODUCTION:- Seismic load are the earthquake load on the structure which acts from ground and transfer to the top the building. The Structure must be designed in such a manner to resist the seismic force. IS 1893 part 1 are followed for seismic loadcase. 

PROCEDURE:-

• Select Seismic Load (Seismic wizard) ribbon from Load tab.

• Select Code spectra for analysis procedure. Click Next.

• Structural Details under base information is automatically inputed. 
• Set the seismic zone to 2 and site class to 2 as shown below.
• Importance factor and percentage damping is obtained from Table 6 and 3 respectively of IS 1893-1 and zone factor from Table 2

• No structural irregularity in the structure as mentioned in Table 4 and 5.

• Use approxmiate fundamental period. Set RC MRF building without any masonry infill in both direction.

• Set structure type to seismic force resisting system in both direction.

• Select all the loadcases and set factor for imposed load to 25% for refered from table 8

• Set allowable storey drift factor as 0.004. Click finish.

• Delete all previously generated combinations.

 

• Select the combinations to be generated.

 

• Select the load combination from load tab to check the combination generated.

• Click on generate to replace only combinations generated by this run.

 

• Click finish.
• Therefore, load combinations are generated.

RESULT:- Hence, seismic loading are generated based IS codal provisions and zone II.

   2. Run the analysis. Summarize your understanding of the analysis results

AIM:- To run the analysis and to summarize the analysis results

INTRODUCTION:- Analyical diagrams like Bending moment, Shear force, Axial force and deflection are used for the study of behaviour of each member of the building.

PROCEDURE:-

• Go to analyse, under settings check modification factor for concrete as 1.

• Run under 1st order analysis. Select all load combinatons.

• After run analysis, the status shows no error.
• Expand the overall displacement, check the maximum positive displacement for both strength and service in solver view.
• Highlight the node for displacement along z axis to check maximum displacement for the member as shown 

• In results view, under results select deflections for different load combinations. Therefore, maximum deflection is shown in load combination 3

  DEFLECTION DUE TO GRAVITY ON THE STRUCTURE

• Select the frame 3 from project window, to check the deflection diagram.

   DEFLECTION DUE TO GRAVITY

• The deflection due to gravity in picture above is correct.
• But the deflection at the cantilever ends are high.
• Similarly, check for different load combinations
• Deflection due to wind is shown below.

 

Axial force

• In result view, select Axial force from results tab.
• Maximum axial force for column is shown for load combinations 3.

• Select the frame 3 from project window, to check the axial force diagram.
• The axial force is acting maximum at bottom of the column which is correct.
• Similarly, check for different load combinations

   AXIAL FORCE FOR GRAVITY LOAD

    MAXIMUM AXIAL FORCE FOR LOAD COMBINATION 3

Bending Moment

• For frame 3, select moment major from results tab.

  MAXIMUM BENDING MOMENT IS SHOWN IN LOAD COMBINATION 3

• Bending moment at the end of the cantilever beam is 0 which is correct. 
• Similarly, check for diffenent load conditions such as wind and seismic.

   BENDING MOMENT FOR WIND LOAD CONDITION

   MAXIMUM BENDING MOMENT ON THE STRUCTURE FOR LOAD COMBINATION 3

Shear force

• For frame 3, select shear major from results tab.
• Check shear major for different load conditions and combinations.

  MAXIMUM SHEAR FORCE IN LOAD COMBINATION 3

   SHEAR FORCE FOR WIND LOAD CONDITION

  SHEAR FORCE FOR SEISMIC LOAD COMBINATION

 RESULT:- Hence, summarized the analysis results obtained after run analysis.