Seismic AnalysisProcedure 2

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SEISMIC COEFFICIENT METHOD USING MEMBER WEIGHT

STEPS INVOLVED:

1. Creation of Geometry 2. Giving Member Property 3. Support Condition

4. Giving Loads : Load 1: DL

Load 2: LL

5. Specifying Analysis Type 6. Post Analysis Print 7. Design

8. Analysis.

(1) In this complete steps 1 to 4. Then follow the further steps for Member Weight.

There are two parts.

Part 1 :. Define Seismic Load

Part 2: Applying Defined Seismic Load,

DEFINING SEISMIC LOAD:

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2. Seismic Parameter screen will appear. Select type:IS1893-2002.

□ Include Accidental Load □ Generate  Add

3. IS1893-2002 Seismic Parameter screen will appear.

Select city or Zone. One III Z=0.16 (Table 2 IS1893-2002) Response Reduction Factor (RF) : (Table 7 IS1893-2002)

: 5 for SMRF

: 3 for OMRF

Importance Factor (I) : (Table 6 IS1893-2002)

: 1 for Ordinary Residential Building : 1.5 for Important Building Other Factors:

Rock or Soil sites Factor (SS) : (Clause 6.4.5 of IS1893-2002)

: 1 for hard soil (N>30)

: 2 for medium soil (10≤ N ≤ 30) for all soils Stiff soil N> 15 for poorly graded, among other

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descriptions)

: 3 for soft soils (N< 10)

Type of Structure (ST) (Optional) : (Clause 7.6 IS1893-2002) =1 for RC Frame Building

= 2 for Steel Frame Building = 3 for all other Building

Damping Ratio (DM) (Table 3 IS1893-2002): 0.05 PX =Period in X Direction (Optional):

PZ =Period in Z Direction (Optional):

Depth of Fcloundation (DT) (For under ground structures) : 2.0m

□

Generate  Add  Close.

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Seismic Definitions screen will appear.

Self weight  Self weight  Add.

Member weight  Loading type UNI :

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Floor weight  Load pressure : 4 KN/m

Define Y range Minimum: --- Maximum :---  Add  Close.

5. Select Member weight Select beam parallel to  x and select beam parallel to z   Assign to selected beam  Assign  Yes.  Close. 2.APPLYING SEISMIC LOAD:

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Number: 1 Loading Type: Seismic Tittle : Seismic X +ve  Add.

Click Load Case 1  Add

Seismic Load  X Direction. Factor 1  Add.  Close. 2. Click Load case details in the Data Area Add.

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Number: 2 Loading Type: Seismic Tittle : Seismic X -ve  Add.

Seismic Load  X Direction. Factor:- 1  Add.  Close. 3. Click Load case details in the Data Area Add.

Number: 3 Loading Type: Seismic Tittle : Seismic Z +ve  Add.

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4. Click Load case details in the Data Area Add.

Number: 4 Loading Type: Seismic Tittle : Seismic Z -ve  Add.

Seismic Load  Z Direction. Factor:- 1  Add.  Close. OTHER LOAD CASES:

To Create DEAD LOAD:

5.Click Load case Details  Add. Number 5 Loading Type: DEAD. Title: Dead Load  Add.

Click Load case 5 Add.

Selfweight Factor:-1 Direction  Y  Add. Click load case 5 Add.

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Member Load  Uniform Force  GY direction. W1 =-12 (9” wall load)  Add.

W1=-6 (4½” wall load)  Add.

Floor load Pressure =-3.5(selfweight+Floor finish) Define Y range Mini.= ---- Max. = ---

Define X range Mini.=0 Max.=---

Define Z range Mini.=0 Max.=---  Add  Close. 6.Click Load case details  Add

Number :6 Loading type : Live Tittle : Live Load  Add.

Click Load case 6 Add.

Floor Load Pressure=-2 (Live load for residential building) Define Y range Mini.= -- Max. = ---

Define X range Mini.=--- Max.=-- Define Z range Mini.=0 Max.=10.36  Add  Close.

After completing the all loads, edit the Seismic Member Weight and Floor Weight as per actual.

Main menu  Edit  Edit input Command file

Zone below: SELFWEIGHT

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Delete the existing member weight value and Copy and Paste the actual member weight in Dead Load case with following changes:

(i) Change the Member load to Member Weight. (ii) The – ve sign changed to +ve sign.

Gy to be deleted. FLOOR WEIGHT

Delete the existing floor weight. Copy and paste the actual load under Dead Load and Live load with following changes:

(i) Floor Load shall be changed to Floor weight.

(ii) The –ve sign changed to +ve sign. GY to be deleted. (iii) The Live Load may be reduced to 0.25 LL if LL <3KN/m2 0.50LL if LL> 3KN/m2.

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LOAD COMBINATION: LOAD COMBINATION:

Main menu  Load Combinations

Loading No.7

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Available Load case Load cases Factor 1. EQX+ve 2. EQX-ve 3. EQZ+ve 4. EQZ-ve 5. DL 6. LL > >> < << 5 6 1.5 1.5 Add

Loading No.8 Name: 1.5(DL+EQX+ve) Default : 1.5

Available Load case Load cases Factor 1. EQX+ve 2. EQX-ve 3. EQZ+ve 4. EQZ-ve 5. DL 6. LL > >> < << 5 1 1.5 1.5 Add

In the similar way add the following load combination.

Load case No. Load case Factor

9 5 1.5 2 1.5 10 5 1.5 3 1.5 11 5 1.5 4 1.5 5 1.2

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12 6 1.2 1 1.2 13 5 1.2 6 1.2 2 1.2 14 5 1.2 6 1.2 3 1.2 15 5 1.2 6 1.2 4 1.2 16 5 0.9 1 1.5 17 5 0.9 2 1.5 18 5 0.9 3 1.5 19 5 0.9 4 1.5 Add  Close. (OR)

AUTO LOAD COMBINATION

Main menu  Commands  Loading Edit Auto Loads  Select Indian Code Select : New category say EQ

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Rule No. Dead Live Seismic

1 1.5 1.5 --

2 1.5 -- 1.5

3 1.2 1.2 1.2

4 0.9 --- 1.5

Click Update Table Close.

Main menuCommands  Loading Auto Load Comb Select : Indian code

Category: EQ  Generate loadsAdd Close. (OR)

Click Load case details  Add  High light Auto Load Combination (in left side).

Select : Indian code

Category: EQ  Generate loadsAdd Close.

Main menuCommandsLoading Load List (selecting Design loads)  Load List.

Available Load Load list

1. EQ X+ve 2. EQ X-ve 3. EQ Z+ve 4. EQ Z-ve. 5.DL 6.LL 7. 1.5(DL+LL) 8. 1.5(DL+EQX+) 9. 1.5(DL-EQX-) 10. 1.5(DL+EQZ+) 11. 1.5(DL-EQZ-) 12. 1.2(DL+LL+EQX+) 13. 1.2(DL+LL+EQX-) > >> < << Load Comb 7 to 19

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14. 1.2(DL+LL+EQZ+) 15. 1.2(DL+LL+EQZ-) 16. 0.9DL+1.5 EQX+ 17. 0.9DL+1.5 EQX- 18. 0.9DL+1.5EQ Z+ 19. 0.9DL+1.5EQ Z- O.k.  Close. STEP 5 ( Analysis ):

From Main menu  Commands – Analysis  Perform Analysis   No print  OK.

STEP 6 (Post Analysis Print):

From Main Menu  Commands  Post Analysis Print  Support Reactions   To view  OK.

STEP 7 ( Design) :

From Main menu  Commands  Design  Concrete Design  Current code=IS 456  From Main menu  Tools  Set current input unit Length =mm; Force = N  OK.

 Select all the member  Define parameters ELY =0.85  Assign ELZ =0.85  Assign FC =20  Assign FYMAIN= 415  Assign FYSEC =415  Assign MAXMAIN =16  Assign MAXSEC =8  Assign MINMAIN =12  Assign

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De select all members and select beams only (Main menu Select Beams parallel to X and Beam parallel to Z axis)  Commands (in data area)

(Concrete Design)  Design beam  Assign  Deselect all beams and select columns only(Main menuSelect Beam parallel to Y axis)  Design column  Assign Take off  Assign  Close.

Note: Save the File and Run the Program.

STEP 8 (Analysis):

From Main Menu  ` Analysis  Run Analysis  Run Analysis  Done.