Challenge

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

CC Mallika15 Feb 2023

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.

To Generate seismic loading based IS codal provisions and zone II. Any other data you can assume and input accordingly
Tools used -
Load.
Loadcases.
Seismic wizard.
Seismic load.
Process -
1. Open the file where we have the structure on which we have to apply the seismic load.
2. Now click on loads tab and select load cases
3. Now create the new load with name as seismic load.
4. Seismic wizard dialog box appears.
5. Now select and fill all the required parameter suitable for structure.
6. At last click on finish button.
7. Now we can check loads in the loadcases and apply them on the structure so we can use those for analysis of the structure.
Result -

First open the file where we have applied the seismic load
2. Now click on analyze tab.
3. Select 1st order linear.
4. Now select loading dialog box appears.
5. In the dialog box select all the required loadings and click ok.
6. Now the results tab will open apply bending moment, shear force and displacement to check the structure.
The axial loads are correct as they are decreasing with increase in height of structure.
The moment major force is also correct as all beam types are selected correctly.
This is deflection is can be decreaded by increasing the grading of concrete in the columns.
The deflection in the stair case is more so supports and grading of the concrete sholud be increased.
7. Now we can obtain the report data by clicking on model and results.
Results -
Here report data sheet we can see all the members are approved and they pass the seismic load.

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

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