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

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.