Earthquake Analysis in STAAD Pro

Sir,

I want to clear two situations of earthquake analysis in STAAD Pro:

First case:

 I use load cases

1. EQ X Direction,

2. EQ -X Direction,

3. Eq Z Direction,

4. EQ -Z Direction,

5. Dead Load,

6. Live Load

And uses load combination as per IS code

1. 1.5 (5+6) i.e.1.5 (DL+LL)
2. 1.5 (5+1) i.e. 1.5 (DL+ EQ in X +ve)
3. 1.5 (5+2) i.e. 1.5 (DL+ EQ in X –ve)
4. 1.5 ((5+3) i.e. 1.5 (DL+ EQ in Z +ve)
5. 1.5 ((5+4) 1.5 (DL+ EQ in Z –ve)
6. 1.2 (5+6+1) i.e 1.2(DL+LL+ EQ in X+ve)
7. 1.2 (5+6+2) i.e. 1.2(DL+LL+ EQ in X-ve)
8. 1.2 (5+6+3) i.e. 1.2(DL+LL+ EQ in Z+ve)
9. 1.2 (5+6+4) i.e. 1.2(DL+LL+ EQ in Z-ve)
10. 0.9 (5) + 1.5 (1) i.e. 0.9DL+ 1.5 EQ in X +ve
11. 0.9 (5) + 1.5 (2) i.e. 0.9DL +1.5 EQ in X-ve
12. 0.9 (5) + 1.5 (3) i.e. 0.9DL+ 1.5 EQ in Z+ve
13. 0.9 (5) + 1.5 (4) i.e. 0.9DL + 1.5 EQ in Z-ve.

Second case:

 I use load cases

1. EQ X Direction,

2. Eq Z Direction,

3. Dead Load,

4. Live Load

And uses load combination as per IS code

1. 1.5 (3+4) i.e.1.5 (DL+LL)
2. 1.5 (3+1) i.e. 1.5 (DL+ EQ in X)
3. 1.5 (3-1) i.e. 1.5 (DL- EQ in X)
4. 1.5 ((3+2) i.e. 1.5 (DL+ EQ in Z)
5. 1.5 ((3-2) 1.5 (DL- EQ in Z)
6. 1.2 (3+4+1) i.e 1.2(DL+LL+ EQ in X)
7. 1.2 (3+4-1) i.e. 1.2(DL+LL- EQ in X)
8. 1.2 (3+4+2) i.e. 1.2(DL+LL+ EQ in Z)
9. 1.2 (3+4-2) i.e. 1.2(DL+LL- EQ in Z)
10. 0.9 (3) + 1.5 (1) i.e. 0.9DL+ 1.5 EQ in X 
11. 0.9 (3) - 1.5 (1) i.e. 0.9DL -1.5 EQ in X
12. 0.9 (3) + 1.5 (2) i.e. 0.9DL+ 1.5 EQ in Z
13. 0.9 (3) - 1.5 (2) i.e. 0.9DL - 1.5 EQ in Z

Above bot cases are correct and have same result or not.?

or I should use first case with some more load cases like:

14. 1.5 (5-1) i.e. 1.5 (DL- EQ in X +ve)
15. 1.5 (5-2) i.e. 1.5 (DL- EQ in X –ve)
16. 1.5 ((5-3) i.e. 1.5 (DL- EQ in Z +ve)
17. 1.5 ((5-4) 1.5 (DL- EQ in Z –ve)
18. 1.2 (5+6-1) i.e 1.2(DL+LL- EQ in X+ve)
19. 1.2 (5+6-2) i.e. 1.2(DL+LL- EQ in X-ve)
20. 1.2 (5+6-3) i.e. 1.2(DL+LL- EQ in Z+ve)
21. 1.2 (5+6-4) i.e. 1.2(DL+LL- EQ in Z-ve)
22. 0.9 (5) - 1.5 (1) i.e. 0.9DL- 1.5 EQ in X +ve
23. 0.9 (5) - 1.5 (2) i.e. 0.9DL -1.5 EQ in X-ve
24. 0.9 (5) - 1.5 (3) i.e. 0.9DL- 1.5 EQ in Z+ve
25. 0.9 (5) - 1.5 (4) i.e. 0.9DL - 1.5 EQ in Z-ve.

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